BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker...

64
BSM Higgs Boson Searches at the Tevatron Collider Frank Filthaut Radboud University Nijmegen / Nikhef for the D0 and CDF Collaborations MCTP Higgs Symposium, May 13-15, 2010

Transcript of BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker...

Page 1: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

BSM Higgs Boson Searches at the Tevatron Collider

Frank FilthautRadboud University Nijmegen / Nikhef

for the D0 and CDF Collaborations

MCTP Higgs Symposium, May 13-15, 2010

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ContentsMSSM

Phenomenology

Neutral Higgs → bb

Neutral Higgs →τ+τ-

Charged Higgs bosons

Fermiophobic Higgs Bosons: H →γγSM Extension to Four Fermion Generations

NMSSM

Phenomenology

Charged Higgs bosons

Light neutral Higgs bosons

2

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ContentsMSSM

Phenomenology

Neutral Higgs → bb

Neutral Higgs →τ+τ-

Charged Higgs bosons

Fermiophobic Higgs Bosons: H →γγSM Extension to Four Fermion Generations

NMSSM

Phenomenology

Charged Higgs bosons

Light neutral Higgs bosons

2

Many details omittedtheory references (computations use FeynHiggs)detailed discussions of statistical treatment, systematics

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MSSM Higgs Phenomenology: Tree LevelHiggs bosons in the MSSM: “Type-II” Two-Higgs Doublet Model

5 Higgs bosons: H, h, A (neutral), H± (charged)

dependence on 2 new parameters: MA,

Masses:

3

Hu =�

H+u

H0u

�, Hd =

�H0

d

H−d

tanβ ≡ vu/vd

m2h,H =

12

�m

2A + m

2Z ∓

�(m2

A− m2

Z)2 + 4m2

Zm2

Asin2(2β)

m2H± = m

2A + m

2W

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MSSM Higgs Phenomenology: Tree LevelHiggs bosons in the MSSM: “Type-II” Two-Higgs Doublet Model

5 Higgs bosons: H, h, A (neutral), H± (charged)

dependence on 2 new parameters: MA,

Masses:

mh < mZ (!)

Couplings:

neutral:

3

SM particle type h coupling H coupling A coupling

up-type quarks cosαsinβ

sinαsinβ

cotβ

down-type quarks, �± − sinαcosβ

cosαcosβ tanβ

W, Z bosons sin(β − α) cos(β − α) 0

Hu =�

H+u

H0u

�, Hd =

�H0

d

H−d

tanβ ≡ vu/vd

H±tb coupling ∼ Vtbmt cotβ(1 − γ5) + mb tanβ(1 + γ5) α: CP-even Higgsmixing parameter

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Beyond Tree LevelSubstantial corrections (e.g. to mh, from top (s)quark loops)

mass/coupling dependence on other SUSY parameters

Embodied in several scenarios (allowing to evade LEP bounds)

4

0 50 100 150 200 250 300Hu [GeV]

0

20

40

60

Hd [

GeV

]

Figure 7.1: A contour map of the Higgs potential, for a typical case with tan β ≈ − cot α ≈ 10.The minimum of the potential is marked by +, and the contours are equally spaced equipotentials.Oscillations along the shallow direction, with H0

u/H0d ≈ 10, correspond to the mass eigenstate h0, while

the orthogonal steeper direction corresponds to the mass eigenstate H0.

∆(m2h0) =

h0

t

+h0

+ h0

Figure 7.2: Contributions to the MSSM lightest Higgs mass from top-quark and top-squark one-loopdiagrams. Incomplete cancellation, due to soft supersymmetry breaking, leads to a large positivecorrection to m2

h0 in the limit of heavy top squarks.

and is traditionally chosen to be negative; it follows that −π/2 < α < 0 (provided mA0 > mZ). TheFeynman rules for couplings of the mass eigenstate Higgs scalars to the Standard Model quarks andleptons and the electroweak vector bosons, as well as to the various sparticles, have been worked outin detail in ref. [165, 166].

The masses of A0, H0 and H± can in principle be arbitrarily large since they all grow with b/ sin(2β).In contrast, the mass of h0 is bounded above. From eq. (7.20), one finds at tree-level [167]:

mh0 < mZ | cos(2β)| (7.23)

This corresponds to a shallow direction in the scalar potential, along the direction (H0u−vu,H0

d −vd) ∝(cos α,− sin α). The existence of this shallow direction can be traced to the fact that the quartic Higgscouplings are given by the square of the electroweak gauge couplings, via the D-term. A contour mapof the potential, for a typical case with tan β ≈ − cot α ≈ 10, is shown in figure 7.1. If the tree-levelinequality (7.23) were robust, the lightest Higgs boson of the MSSM would have been discovered atLEP2. However, the tree-level formula for the squared mass of h0 is subject to quantum correctionsthat are relatively drastic. The largest such contributions typically come from top and stop loops, asshown‡ in fig. 7.2. In the simple limit of top squarks that have a small mixing in the gauge eigenstatebasis and with masses mt̃1

, mt̃2much greater than the top quark mass mt, one finds a large positive

one-loop radiative correction to eq. (7.20):

∆(m2h0) =

3

4π2cos2α y2

t m2t ln

(mt̃1

mt̃2/m2

t

). (7.24)

This shows that mh0 can exceed the LEP bounds.‡In general, one-loop 1-particle-reducible tadpole diagrams should also be included. However, they just cancel against

tree-level tadpoles, and so both can be omitted, if the VEVs vu and vd are taken at the minimum of the loop-correctedeffective potential (see previous footnote).

68

Scenario mmax

h no-mixing gluophobic small αeff

t̃1, t̃2 mixing parameter Xt 2 TeV 0 -0.75 TeV -1.1 TeV

Higgs bilinear coupling µ ±200 GeV ±200 GeV ±300 GeV 2 TeV

SU(2) gaugino mass M2 200 GeV 200 GeV 300 GeV 500 GeV

gaugino mass mg̃ 0.8 TeV 1.6 TeV 0.5 TeV 0.5 TeV

sfermion SUSY breaking parm. MSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV

tuned to maximize mh

suppressed h → bb, ττ

suppressed gg → h

between top squarks

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Beyond Tree LevelSubstantial corrections (e.g. to mh, from top (s)quark loops)

mass/coupling dependence on other SUSY parameters

Embodied in several scenarios (allowing to evade LEP bounds)

4

0 50 100 150 200 250 300Hu [GeV]

0

20

40

60

Hd [

GeV

]

Figure 7.1: A contour map of the Higgs potential, for a typical case with tan β ≈ − cot α ≈ 10.The minimum of the potential is marked by +, and the contours are equally spaced equipotentials.Oscillations along the shallow direction, with H0

u/H0d ≈ 10, correspond to the mass eigenstate h0, while

the orthogonal steeper direction corresponds to the mass eigenstate H0.

∆(m2h0) =

h0

t

+h0

+ h0

Figure 7.2: Contributions to the MSSM lightest Higgs mass from top-quark and top-squark one-loopdiagrams. Incomplete cancellation, due to soft supersymmetry breaking, leads to a large positivecorrection to m2

h0 in the limit of heavy top squarks.

and is traditionally chosen to be negative; it follows that −π/2 < α < 0 (provided mA0 > mZ). TheFeynman rules for couplings of the mass eigenstate Higgs scalars to the Standard Model quarks andleptons and the electroweak vector bosons, as well as to the various sparticles, have been worked outin detail in ref. [165, 166].

The masses of A0, H0 and H± can in principle be arbitrarily large since they all grow with b/ sin(2β).In contrast, the mass of h0 is bounded above. From eq. (7.20), one finds at tree-level [167]:

mh0 < mZ | cos(2β)| (7.23)

This corresponds to a shallow direction in the scalar potential, along the direction (H0u−vu,H0

d −vd) ∝(cos α,− sin α). The existence of this shallow direction can be traced to the fact that the quartic Higgscouplings are given by the square of the electroweak gauge couplings, via the D-term. A contour mapof the potential, for a typical case with tan β ≈ − cot α ≈ 10, is shown in figure 7.1. If the tree-levelinequality (7.23) were robust, the lightest Higgs boson of the MSSM would have been discovered atLEP2. However, the tree-level formula for the squared mass of h0 is subject to quantum correctionsthat are relatively drastic. The largest such contributions typically come from top and stop loops, asshown‡ in fig. 7.2. In the simple limit of top squarks that have a small mixing in the gauge eigenstatebasis and with masses mt̃1

, mt̃2much greater than the top quark mass mt, one finds a large positive

one-loop radiative correction to eq. (7.20):

∆(m2h0) =

3

4π2cos2α y2

t m2t ln

(mt̃1

mt̃2/m2

t

). (7.24)

This shows that mh0 can exceed the LEP bounds.‡In general, one-loop 1-particle-reducible tadpole diagrams should also be included. However, they just cancel against

tree-level tadpoles, and so both can be omitted, if the VEVs vu and vd are taken at the minimum of the loop-correctedeffective potential (see previous footnote).

68

Scenario mmax

h no-mixing gluophobic small αeff

t̃1, t̃2 mixing parameter Xt 2 TeV 0 -0.75 TeV -1.1 TeV

Higgs bilinear coupling µ ±200 GeV ±200 GeV ±300 GeV 2 TeV

SU(2) gaugino mass M2 200 GeV 200 GeV 300 GeV 500 GeV

gaugino mass mg̃ 0.8 TeV 1.6 TeV 0.5 TeV 0.5 TeV

sfermion SUSY breaking parm. MSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV

tuned to maximize mh

suppressed h → bb, ττ

suppressed gg → h

between top squarks

Main focus of Tevatron analyses

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0

20

40

60

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0 20 40 60 80 100 120 1400

20

40

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100

120

140

160

mh (GeV/c

2)

mA

(G

eV/c

2)

Excludedby LEP

TheoreticallyInaccessible

mh-max

1

10

0 20 40 60 80 100 120 140

1

10

mh (GeV/c

2)

tan!

Excludedby LEP

TheoreticallyInaccessible

mh-max

1

10

0 200 400

1

10

mA

(GeV/c2)

tan!

Excludedby LEP

mh-max

1

10

0 200 400

1

10

mH± (GeV/c

2)

tan!

Excludedby LEP

mh-max

Theo

reti

call

y I

nac

cess

ible

0

20

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0 20 40 60 80 100 120 1400

20

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60

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100

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mh (GeV/c

2)

mA

(G

eV/c

2)

Excludedby LEP

TheoreticallyInaccessible

No Mixing

1

10

0 20 40 60 80 100 120 140

1

10

mh (GeV/c

2)

tan!

Excludedby LEP

TheoreticallyInaccessible

No Mixing

1

10

0 200 400

1

10

mA

(GeV/c2)

tan!

Excludedby LEP

No Mixing

1

10

0 200 400

1

10

mH± (GeV/c

2)

tan!

Excludedby LEP

No Mixing

Th

eore

tica

lly

In

acce

ssib

le

MSSM Higgs Production at the TevatronLEP analyses focused on ZH associated production ! exclusion mainly at low tanβ

5

Page 9: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

MSSM Higgs Production at the TevatronLEP analyses focused on ZH associated production ! exclusion mainly at low tanβMost of the Tevatron programme focuses on high tanβ ! complementarity: different production mechanisms

5

100 150 200 250M [GeV]

10-1

100

101

102

103

104

pro

duct

ion

cros

s se

ctio

n [fb

]

hHA

Tevatron, s = 1.96 TeVmh

max, tan = 5

(bb)

gg

qq

W/Z

tt

100 150 200 250M [GeV]

10-1

100

101

102

103

104

105

106

pro

duct

ion

cros

s se

ctio

n [fb

]

hHA

Tevatron, s = 1.96 TeVmh

max, tan = 40

(bb)

gg

qq

W/Z

tt

(Tev4LHC WG)

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MSSM Higgs Production at the TevatronLEP analyses focused on ZH associated production ! exclusion mainly at low tanβMost of the Tevatron programme focuses on high tanβ ! complementarity: different production mechanisms

5

100 150 200 250M [GeV]

10-1

100

101

102

103

104

pro

duct

ion

cros

s se

ctio

n [fb

]

hHA

Tevatron, s = 1.96 TeVno mixing, tan = 5

(bb)

gg

qqW/Z

tt

100 150 200 250M [GeV]

10-1

100

101

102

103

104

105

106

pro

duct

ion

cros

s se

ctio

n [fb

]

hHA

Tevatron, s = 1.96 TeVno mixing, tan = 40

(bb)

gg

qq

W/Z

tt

(Tev4LHC WG)

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(GeV)Am100 120 140 160 180 200 220 240

100

150

200

250

300=30!=200 GeV, tanµmhmax scenario,

h

H

A

±H

(GeV)Am100 120 140 160 180 200 220 240

m (G

eV)

100

150

200

250

300=3!=200 GeV, tanµmhmax scenario,

h

H

A

±H

MSSM Higgs Production at the TevatronLEP analyses focused on ZH associated production ! exclusion mainly at low tanβMost of the Tevatron programme focuses on high tanβ ! complementarity: different production mechanisms

5

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(GeV)Am100 120 140 160 180 200 220 240

100

150

200

250

300=30!=200 GeV, tanµnomixing scenario,

h

H

A

±H

(GeV)Am100 120 140 160 180 200 220 240

m (G

eV)

100

150

200

250

300=3!=200 GeV, tanµnomixing scenario,

h

H

A

±H

MSSM Higgs Production at the TevatronLEP analyses focused on ZH associated production ! exclusion mainly at low tanβMost of the Tevatron programme focuses on high tanβ ! complementarity: different production mechanisms

5

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MSSM Higgs Production at the TevatronLEP analyses focused on ZH associated production ! exclusion mainly at low tanβMost of the Tevatron programme focuses on high tanβ ! complementarity: different production mechanisms

General feature:

masses, production cross sections for A, h/H very similar ! “Φ”

production of “other CP-even boson (H/h) ~ negligible

5

Analyses don’t attempt to identify individual Higgs bosons, but look for an overall excess instead

Page 14: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

bΦ → bbbLargest branching fraction (~90%) ... but need extra b jet to be visible

triple b-tagged data, look for excess in invariant mass spectrum of leading b-tagged jets

emphasis on understanding multijet background

6

+

update from 1.9 fb-1

bb b b

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bΦ → bbbLargest branching fraction (~90%) ... but need extra b jet to be visible

triple b-tagged data, look for excess in invariant mass spectrum of leading b-tagged jets

emphasis on understanding multijet background

CDF analysis (2.5 fb-1):

create bkgd template shapes from double tagged sample (also in mvtx variable: extra discrimination)

template fit including also signal

in absence of significant excess, use likelihood ratio to derive limits

6

+

dijet mass m12 (GeV/c2)

frac

tion/

(15

GeV

/c2 )

bbBbBbbbXbCbbQb

CDF Run II PreliminaryBackground Templates

0

0.025

0.05

0.075

0.1

0.125

0.15

0.175

0.2

0.225

50 100 150 200 250 300 350

update from 1.9 fb-1

bb b b

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bΦ → bbbLargest branching fraction (~90%) ... but need extra b jet to be visible

triple b-tagged data, look for excess in invariant mass spectrum of leading b-tagged jets

emphasis on understanding multijet background

CDF analysis (2.5 fb-1):

create bkgd template shapes from double tagged sample (also in mvtx variable: extra discrimination)

template fit including also signal

in absence of significant excess, use likelihood ratio to derive limits

6

+

flavor separator xtags (GeV/c2)

frac

tion/

(1 G

eV/c

2 )

bbBbBbbbXbCbbQb

CDF Run II PreliminaryBackground Templates

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0 1 2 3 4 5 6 7 8 9

update from 1.9 fb-1

bb b b

Page 17: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

bΦ → bbbLargest branching fraction (~90%) ... but need extra b jet to be visible

triple b-tagged data, look for excess in invariant mass spectrum of leading b-tagged jets

emphasis on understanding multijet background

CDF analysis (2.5 fb-1):

create bkgd template shapes from double tagged sample (also in mvtx variable: extra discrimination)

template fit including also signal

in absence of significant excess, use likelihood ratio to derive limits

6

+

dijet mass m12 (GeV/c2)

frac

tion/

(15

GeV

/c2 )

mH = 90 GeV/c2

mH = 120 GeV/c2

mH = 150 GeV/c2

mH = 180 GeV/c2

mH = 210 GeV/c2

CDF Run II PreliminarySignal Templates

0

0.05

0.1

0.15

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0.25

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50 100 150 200 250 300 350

update from 1.9 fb-1

bb b b

Page 18: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

bΦ → bbbLargest branching fraction (~90%) ... but need extra b jet to be visible

triple b-tagged data, look for excess in invariant mass spectrum of leading b-tagged jets

emphasis on understanding multijet background

CDF analysis (2.5 fb-1):

create bkgd template shapes from double tagged sample (also in mvtx variable: extra discrimination)

template fit including also signal

in absence of significant excess, use likelihood ratio to derive limits

6

+

dijet mass m12 (GeV/c2)

even

ts/(1

5 G

eV/c

2 ) CDF Run II PreliminaryBest Fit (with signal template)

over

flow

bbBbBbbbXbCbbQbmH=150CDF 2.5/fb

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50 100 150 200 250 300 350

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L(data| ˆ̂b)

update from 1.9 fb-1

bb b b

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bΦ → bbb (2)For high tanβ, the decay widths ΓΦ become substantial

resonance less easily distinguished ! loss of sensitivity

7

mA (GeV/c2)

tan

CDF Run II Preliminary (2.5/fb)

mh max scenario, ! = -200 GeV ( b=-0.21)

Higgs width included

expected limit1 band2 bandobserved limit

95" C.L. upper limits

020406080

100120140160180200

100 120 140 160 180 200

∆b ∝ tanβ · µ

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bΦ → bbb (3)D0 analysis (2.6 fb-1):

separation into 3/4/5-jet samples

flavour composition estimated using multiple b-tagging criteria

likelihood discriminant to improve S/B ratio

using topological information

obtain from double-tagged data, use to predict triple-tagged bkgd

8

D =Psig(�x)

Psig(�x) + Pbkg(�x)

D0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10

0.01

0.02

0.03

0.04

0.05

0.06

0.07

0.08

0.09

0.1 -1DØ Prelim., L=1.61 fb

3 jets exclusiveLow-mass LH

DØ DataExp. bkg Heavy flav.Higgs Signal

D0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10

0.01

0.02

0.03

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0.05

0.06

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0.09

0.1 -1DØ Prelim., L=1.61 fb

3 jets exclusiveHigh-mass LH

DØ DataExp. bkg Heavy flav.Higgs Signal

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bΦ → bbb (3)D0 analysis (2.6 fb-1):

separation into 3/4/5-jet samples

flavour composition estimated using multiple b-tagging criteria

likelihood discriminant to improve S/B ratio

using topological information

obtain from double-tagged data, use to predict triple-tagged bkgd

8

D =Psig(�x)

Psig(�x) + Pbkg(�x)

]2 [GeV/cbbM50 100 150 200 250 300 350 400

-40

-20

0

20

40

]

2Pa

iring

s / [1

0 G

eV/c

100

200

300

400

500

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700

100

200

300

400

500

600

700 -1DØ Prelim., L=1.61 fba) 3 jets exclusive

LHHigh-mass Y

DØ Data Exp. bkgHeavy flav.

]2 [GeV/cbbM50 100 150 200 250 300 350 400

-20-15-10

-505

101520

]

2Pa

iring

s / [1

0 G

eV/c

50100150200250300350400450

50100150200250300350400450 -1DØ Prelim., L=1.61 fb

b) 4 jets exclusiveLH

High-mass Y

DØ Data Exp. bkgHeavy flav.

]2 [GeV/cbbM50 100 150 200 250 300 350 400

-20-15-10

-505

101520

]

2Pa

iring

s / [1

0 G

eV/c

20

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100

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140 -1DØ Prelim., L=1.61 fbc) 5 jets exclusive

LHHigh-mass Y

DØ Data Exp. bkgHeavy flav.

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bΦ → bbb (3)D0 analysis (2.6 fb-1):

separation into 3/4/5-jet samples

flavour composition estimated using multiple b-tagging criteria

likelihood discriminant to improve S/B ratio

using topological information

obtain from double-tagged data, use to predict triple-tagged bkgd

8

D =Psig(�x)

Psig(�x) + Pbkg(�x)

]2 [GeV/cAm80 100 120 140 160 180 200 220

tan

20

40

60

80

100

120

140

Excluded AreaExpected Limit

Excl

uded

at L

EP

-1DØ Preliminary, L=2.6 fb=-200 GeV ! max, hm

bgb

Page 23: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Φ → τ+τ-

Branching fraction only ~ 0.1, but much cleaner! ! can use this decay mode with gluon fusion channel

but need ≥ 1 leptonic decay: τμτhad, τeτhad, τeτμτ decays ! no sharp mass peak

substantial backgrounds: Z → τ+τ-, W+jets, multijets

9

t,b

Page 24: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Φ → τ+τ-

Branching fraction only ~ 0.1, but much cleaner! ! can use this decay mode with gluon fusion channel

but need ≥ 1 leptonic decay: τμτhad, τeτhad, τeτμτ decays ! no sharp mass peak

substantial backgrounds: Z → τ+τ-, W+jets, multijets

CDF published analysis (1.8 fb-1):

using “visible mass”

Z → τ+τ- from MC: energy scale

instrumental backgrounds:from initial looser τhad selection,known fake rate

9

t,b

0 50 100 150 200 250 300

mA = 140 GeV/c2

0.1

1

10

100

mvis (GeV/c2)

1

10

100

1000mA = 140 GeV/c2

e+τ, μ+τ

e+μ

Jet→τOther EWZ/γ*→ττφ→ττ

even

tsev

ents

(a)

(b)

m2vis = (pτ1 + pτ2 + /pT )2

/pT ≡ (/ET , /Ex , /Ey , 0)

Page 25: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Φ → τ+τ-

Branching fraction only ~ 0.1, but much cleaner! ! can use this decay mode with gluon fusion channel

but need ≥ 1 leptonic decay: τμτhad, τeτhad, τeτμτ decays ! no sharp mass peak

substantial backgrounds: Z → τ+τ-, W+jets, multijets

CDF published analysis (1.8 fb-1):

using “visible mass”

Z → τ+τ- from MC: energy scale

instrumental backgrounds:from initial looser τhad selection,known fake rate

9

t,b

m2vis = (pτ1 + pτ2 + /pT )2

/pT ≡ (/ET , /Ex , /Ey , 0)

small model dependence!

Page 26: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Φ → τ+τ- (2)D0: extended published analysis (1 fb-1) by 1.2 fb-1 (τμτhad)

Analysis similar to CDF (Z → τ+τ-, instrumental backgrounds)

optimised (NN) identification of τ→πντ, τ→ρντ, 3-prong decays

additional rejection against W (→ e/μ ν) + jets background (MT)

10

Visible Mass (GeV)20 40 60 80 100120140160180200220240

Even

ts

1

10

210

310

20 40 60 80 100120140160180200220240

1

10

210

310 DataZMultijetW + jets

tOther EW + t, 160 GeV

-1DØ, 1.0 fbh

!

Visible Mass (GeV)20 40 60 80 100120140160180200220240

Even

ts

1

10

210

310 (a)

Visible Mass (GeV)40 60 80 100 120 140 160 180 200 220 24040 60 80 100 120 140 160 180 200 220 240

DataZMultijetW + jets

tOther EW + t, 160 GeV

-1DØ, 1.0 fbhe

Visible Mass (GeV)40 60 80 100 120 140 160 180 200 220 240

(b)

Visible Mass (GeV)60 80 100 120 140 160 180 200 220 24060 80 100 120 140 160 180 200 220 240

DataZMultijetW + jets

tOther EW + t, 160 GeV

-1DØ, 1.0 fb!e

Visible Mass (GeV)60 80 100 120 140 160 180 200 220 240

(c)

Page 27: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Φ → τ+τ- (2)D0: extended published analysis (1 fb-1) by 1.2 fb-1 (τμτhad)

Analysis similar to CDF (Z → τ+τ-, instrumental backgrounds)

optimised (NN) identification of τ→πντ, τ→ρντ, 3-prong decays

additional rejection against W (→ e/μ ν) + jets background (MT)

10

) (GeV)vis

Visible Mass (M0 20 40 60 80 100 120 140 160 180 200 220 240

Even

ts

1

10

210

0 20 40 60 80 100 120 140 160 180 200 220 240

1

10

210

Multijet & W+jets

ttWW/WZ/ZZ

!!Z

Zdata

= 50 pb)=160GeV (M

) -1 Preliminary (1.2 fbD

Page 28: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Φ → τ+τ- (2)D0: extended published analysis (1 fb-1) by 1.2 fb-1 (τμτhad)

Analysis similar to CDF (Z → τ+τ-, instrumental backgrounds)

optimised (NN) identification of τ→πντ, τ→ρντ, 3-prong decays

additional rejection against W (→ e/μ ν) + jets background (MT)

10

(GeV)AM100 120 140 160 180 200 220 240

tan

0

10

20

30

40

50

60

70

80

90

100

Observed limitExpected limitLEP 2

100 120 140 160 180 200 220 2400

10

20

30

40

50

60

70

80

90

100-1DØ prel., 1-2.2 fb

= +200 GeV!, maxhm

(GeV)AM100 120 140 160 180 200 220 240

tan

0

10

20

30

40

50

60

70

80

90

100

Observed limitExpected limitLEP 2

100 120 140 160 180 200 220 2400

10

20

30

40

50

60

70

80

90

100-1DØ prel., 1-2.2 fb

= +200 GeV!No-mixing,

Limits generally (slightly) more restrictive than for bbb final state

Page 29: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

bΦ → bτ+τ-

Small overlap with inclusive τ+τ- search, reduced Z → τ+τ-

background at low mΦ ! complementarity

D0 published analysis (2.7 fb-1, τμτhad):

dominant backgrounds: tt, multijet, Z+jets

estimate multijet background from same-sign events

enrich further using two (tt, multijet) multivariate discriminants

11

published

D0 0.2 0.4 0.6 0.8 1

Even

ts /

0.1

0

5

10

15

20

25 -1DØ, 2.7 fb

(a)

2=120 GeV/cM

DataZ+jetsMultijettt

OtherSignal

D0 0.2 0.4 0.6 0.8 1

Even

ts /

0.1

0

5

10

15

20

25

Page 30: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

bΦ → bτ+τ-

Small overlap with inclusive τ+τ- search, reduced Z → τ+τ-

background at low mΦ ! complementarity

D0 published analysis (2.7 fb-1, τμτhad):

dominant backgrounds: tt, multijet, Z+jets

estimate multijet background from same-sign events

enrich further using two (tt, multijet) multivariate discriminants

11

published

)2 (GeV/cAM90 100 110 120 130 140 150 160 170 180

tan

0

20

40

60

80

100

90 100 110 120 130 140 150 160 170 1800

20

40

60

80

100

Observed limitExpected limitLEP

-1Ø, 0.3 fbD

-1Ø, 2.7 fbD

(c)

2 = -200 GeV/c! maxh m

)2 (GeV/cAM90 100 110 120 130 140 150 160 170 180

tan

0

20

40

60

80

100

90 100 110 120 130 140 150 160 170 1800

20

40

60

80

100

Observed limitExpected limitLEP

-1Ø, 0.3 fbD

-1Ø, 2.7 fbD

(b)

2 = -200 GeV/c! No-mixing

Page 31: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

bΦ → bτ+τ-

Small overlap with inclusive τ+τ- search, reduced Z → τ+τ-

background at low mΦ ! complementarity

D0 published analysis (2.7 fb-1, τμτhad):

dominant backgrounds: tt, multijet, Z+jets

estimate multijet background from same-sign events

enrich further using two (tt, multijet) multivariate discriminants

11

published

)2 (GeV/cAM90 100 110 120 130 140 150 160 170 180

tan

0

20

40

60

80

100

90 100 110 120 130 140 150 160 170 1800

20

40

60

80

100

Observed limitExpected limitLEP

-1Ø, 0.3 fbD

-1Ø, 2.7 fbD

(a)

2 = +200 GeV/c! No-mixing

)2 (GeV/cAM90 100 110 120 130 140 150 160 170 180

tan

0

20

40

60

80

100

90 100 110 120 130 140 150 160 170 1800

20

40

60

80

100

Observed limitExpected limitLEP

-1Ø, 0.3 fbD

-1Ø, 2.7 fbD

(c)

2 = +200 GeV/c! maxh m

Page 32: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Combinations

Several channels with similar sensitivity ! combining results makes sense!

D0: combination of all neutral MSSM Higgs boson results

Tevatron: combination of τ+τ- results

12

]2 [GeV/cAm100 120 140 160 180 200 220

tan

20

40

60

80

100

Excluded by LEPObserved limitExpected limit

1 !Expected limit 2 !Expected limit

=-200 GeV " max, hm

-1DØ Preliminary, L= 1.0-2.6 fb

]2 [GeV/cAm100 120 140 160 180 200 220

tan

20

40

60

80

100

]2 [GeV/cAm100 120 140 160 180 200 220

tan

20

40

60

80

100

Excluded by LEPObserved limitExpected limit

1 !Expected limit 2 !Expected limit

=+200 GeV" max, hm

-1DØ Preliminary, L= 1.0-2.6 fb

]2 [GeV/cAm100 120 140 160 180 200 220

tan

20

40

60

80

100

NB: only 1.2 fb-1 of bττ data used

Page 33: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Combinations

Several channels with similar sensitivity ! combining results makes sense!

D0: combination of all neutral MSSM Higgs boson results

Tevatron: combination of τ+τ- results

12

]2 [GeV/cAm100 120 140 160 180 200 220

tan

20

40

60

80

100

Excluded by LEPObserved limitExpected limit

1 !Expected limit 2 !Expected limit

=-200 GeV "no mixing,

-1DØ Preliminary, L= 1.0-2.6 fb

]2 [GeV/cAm100 120 140 160 180 200 220

tan

20

40

60

80

100

]2 [GeV/cAm100 120 140 160 180 200 220

tan

20

40

60

80

100

Excluded by LEPObserved limitExpected limit

1 !Expected limit 2 !Expected limit

=+200 GeV"no mixing,

-1DØ Preliminary, L= 1.0-2.6 fb

]2 [GeV/cAm100 120 140 160 180 200 220

tan

20

40

60

80

100

NB: only 1.2 fb-1 of bττ data used

Page 34: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Combinations

Several channels with similar sensitivity ! combining results makes sense!

D0: combination of all neutral MSSM Higgs boson results

Tevatron: combination of τ+τ- results

12

]2 [GeV/cAm100 120 140 160 180 200

tan

10

20

30

40

50

60

70

80

90

100

Excluded by LEPObserved limitExpected limit

1 !Expected limit 2 !Expected limit

=-200 GeV " max, hm

-1Tevatron Run II Preliminary, L= 1.8-2.2 fb

]2 [GeV/cAm100 120 140 160 180 200

tan

10

20

30

40

50

60

70

80

90

100

]2 [GeV/cAm100 120 140 160 180 200

tan

10

20

30

40

50

60

70

80

90

100

Excluded by LEPObserved limitExpected limit

1 !Expected limit 2 !Expected limit

=+200 GeV" max, hm

-1Tevatron Run II Preliminary, L= 1.8-2.2 fb

]2 [GeV/cAm100 120 140 160 180 200

tan

10

20

30

40

50

60

70

80

90

100

Page 35: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Combinations

Several channels with similar sensitivity ! combining results makes sense!

D0: combination of all neutral MSSM Higgs boson results

Tevatron: combination of τ+τ- results

12

]2 [GeV/cAm100 120 140 160 180 200

tan

10

20

30

40

50

60

70

80

90

100

Excluded by LEPObserved limitExpected limit

1 !Expected limit 2 !Expected limit

=-200 GeV "no mixing,

-1Tevatron Run II Preliminary, L= 1.8-2.2 fb

]2 [GeV/cAm100 120 140 160 180 200

tan

10

20

30

40

50

60

70

80

90

100

]2 [GeV/cAm100 120 140 160 180 200

tan

10

20

30

40

50

60

70

80

90

100

Excluded by LEPObserved limitExpected limit

1 !Expected limit 2 !Expected limit

=+200 GeV"no mixing,

-1Tevatron Run II Preliminary, L= 1.8-2.2 fb

]2 [GeV/cAm100 120 140 160 180 200

tan

10

20

30

40

50

60

70

80

90

100

Page 36: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Charged Higgs Bosons

Focus on t → H+b decays (heavy H → tb out of Tevatron reach)

exploited in multiple ways to search for H → cs, τν decays in tt events

modified distribution of tt events over l+jets, l+l,and l+τhad final states

l = e, μpeak in l+jets di-jet invariantmass spectrum (H → cs)

13

)!tan(1 10

Bra

nchi

ng ra

tio

0

0.2

0.4

0.6

0.8

1=100 GeV+HM

decays to ±H"#scb*t

0h+W0A+W

b)+ H$BR(t

t

t̄b̄

b

H!

W

Page 37: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Charged Higgs Bosons: H→τνHigh tanβ: dominant decay mode

D0 analysis (0.9 fb-1) of l+τhad mode:

separate 3-jet, >3-jet channels

significant background from W+jets ! likelihood discriminant

Fix σ(tt) to SM value

14

published

Discriminant0 0.2 0.4 0.6 0.8 1

Even

ts /

0.05

0

10

20

30

40

50 (a)

Discriminant0 0.2 0.4 0.6 0.8 1

Even

ts /

0.05

0

10

20

30

40

50 -1DØ 0.9 fb

(B = 0)ttOther MCW+jetsMultijet

Discriminant0 0.2 0.4 0.6 0.8 1

Even

ts /

0.05

0

10

20

30

40

50 (b)

Discriminant0 0.2 0.4 0.6 0.8 1

Even

ts /

0.05

0

10

20

30

40

50 -1DØ 0.9 fb

(B = 0.5)ttOther MCW+jetsMultijet

B ≡ B(t →H+b)e + >3jets

(kinematic/topological variables)

(MH = 120 GeV)

Page 38: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Charged Higgs Bosons: H→τνHigh tanβ: dominant decay mode

D0 analysis (0.9 fb-1) of l+τhad mode:

separate 3-jet, >3-jet channels

significant background from W+jets ! likelihood discriminant

Fix σ(tt) to SM value

14

published

[GeV]!Hm80 100 120 140 160

b)+ H

Upp

er li

mit

on B

(t

00.05

0.10.15

0.20.25

0.30.35

0.40.45

0.5 1 sd!Expected

Observed

-1D0 0.9 fb

[GeV]!Hm80 100 120 140 160

b)+ H

Upp

er li

mit

on B

(t

00.05

0.10.15

0.20.25

0.30.35

0.40.45

0.5

[GeV]!Hm80 100 120 140 160 180

)ta

n(

20406080

100120140160180200220

-1D0 0.9 fbTheo

retica

lly In

acce

ssible

Expected

Observed

[GeV]!Hm80 100 120 140 160 180

)ta

n(

20406080

100120140160180200220

(kinematic/topological variables)

Method does not exploit depletion in other final states...

Page 39: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Charged Higgs Bosons: Combination

Better alternative: consider l+jets, l+l, l+τhad channels simultaneously

D0 analysis (1 fb-1):

follow earlier individual analyses, but use ε(MH)

allows for simultaneous fits of σ(tt) ! improvement for small MH!

Interpretation in various MSSM scenarios

15

published

MH = 80 GeV

l+jets 1 tag l+jets 2 tag dilepton +lepton

even

tN

10

210

310)=1 +B(H

Data b)=0.0+ H Br(t ttb)=0.3+ H Br(t ttb)=0.6+ H Br(t tt

background

-1DØ, L=1.0 fb

l+jets 1 tag l+jets 2 tag dilepton +lepton

even

tN

10

210

310)=1s c +B(H

Data b)=0.0+ H Br(t ttb)=0.3+ H Br(t ttb)=0.6+ H Br(t tt

background

-1DØ, L=1.0 fb

Page 40: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Charged Higgs Bosons: Combination

Better alternative: consider l+jets, l+l, l+τhad channels simultaneously

D0 analysis (1 fb-1):

follow earlier individual analyses, but use ε(MH)

allows for simultaneous fits of σ(tt) ! improvement for small MH!

Interpretation in various MSSM scenarios

15

published

Assuming B(H → τν) + B(H → cs) = 1

)s c+B(H0 0.2 0.4 0.6 0.8 1

b)

+ H

B(t

0

0.1

0.2

0.3

0.4

0.5

0.6Expected 95% CL limitObserved 95% CL limit

= 80 GeV+HM

-1DØ, L =1.0 fb

)s c+B(H0 0.2 0.4 0.6 0.8 1

b)

+ H

B(t

0

0.1

0.2

0.3

0.4

0.5

0.6

= 100 GeV+HM

-1DØ, L =1.0 fb

)s c+B(H0 0.2 0.4 0.6 0.8 1

b)

+ H

B(t

0

0.1

0.2

0.3

0.4

0.5

0.6

= 120 GeV+HM

-1DØ, L =1.0 fb

)s c+B(H0 0.2 0.4 0.6 0.8 1

b)

+ H

B(t

0

0.1

0.2

0.3

0.4

0.5

0.6

= 140 GeV+HM

-1DØ, L =1.0 fb

)s c+B(H0 0.2 0.4 0.6 0.8 1

b)

+ H

B(t

0

0.1

0.2

0.3

0.4

0.5

0.6

= 150 GeV+HM

-1DØ, L =1.0 fb

)s c+B(H0 0.2 0.4 0.6 0.8 1

b)

+ H

B(t

0

0.1

0.2

0.3

0.4

0.5

0.6

= 155 GeV+HM

-1DØ, L =1.0 fb

Page 41: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

[GeV]+HM80 100 120 140 160

b)+ H

B(t

0

0.2

0.4

0.6

0.8

1

)=1 + +B(HExpected 95% CL limitObserved 95% CL limit

-1DØ, L=1.0 fb

Charged Higgs Bosons: Combination

Better alternative: consider l+jets, l+l, l+τhad channels simultaneously

D0 analysis (1 fb-1):

follow earlier individual analyses, but use ε(MH)

allows for simultaneous fits of σ(tt) ! improvement for small MH!

15

published

Page 42: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Charged Higgs Bosons: Combination

Better alternative: consider l+jets, l+l, l+τhad channels simultaneously

D0 analysis (1 fb-1):

follow earlier individual analyses, but use ε(MH)

allows for simultaneous fits of σ(tt) ! improvement for small MH!

Interpretation in various MSSM scenarios

15

published

[GeV] + HM80 90 100 110 120 130 140 150 160

tan

100

200 Theoretically inaccessibleExpected 95% CL limitExcluded 95% CL region

-1DØ, L = 1.0 fb-max scenariohm

[GeV] + HM80 90 100 110 120 130 140 150 160

tan

20

40

60

80

100

Theoretically inaccessibleExpected 95% CL limitExcluded 95% CL region

-1DØ, L =1.0 fb

no-mixing scenario

Page 43: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Charged Higgs Bosons: Combination

Better alternative: consider l+jets, l+l, l+τhad channels simultaneously

D0 analysis (1 fb-1):

follow earlier individual analyses, but use ε(MH)

allows for simultaneous fits of σ(tt) ! improvement for small MH!

Interpretation in various MSSM scenarios

15

published

[GeV]+HM80 90 100 110 120 130 140 150 160

tan

0.5

1

1.5

2

2.5

3)=1s c +B(H

Expected 95% CL limitExcluded 95% CL region

-1DØ, L =1.0 fb

Leptophobic Higgs: MSSM for low tanβ, Multi-Higgs Doublet models

Page 44: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Charged Higgs Bosons: Combination

Better alternative: consider l+jets, l+l, l+τhad channels simultaneously

D0 analysis (1 fb-1):

follow earlier individual analyses, but use ε(MH)

allows for simultaneous fits of σ(tt) ! improvement for small MH!

Interpretation in various MSSM scenarios

15

published

[GeV]+HM80 90 100 110 120 130 140 150 160

tan

10

20

30

40

50

60

Theoretically inaccessible) < 0.95 +) + B(Hs c +B(H

Expected 95% CL limitExcluded 95% CL region

-1DØ, L =1.0 fb

CPX scenariogh

CPXgh scenario: substantial H → cs fraction even for high 22 < tanβ < 55

Page 45: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Charged Higgs Bosons: H→csCDF analysis (2.2 fb-1) of double-tagged l+jets final states:

kinematic fit using mt, (leptonic) MW constraints

binned ML fit to non-b di-jet mass distribution

16

published

]2M(dijet) [GeV/c0 20 40 60 80 100 120 140 160 180

]2N

umbe

r of E

vent

s/[6

GeV

/c

0

5

10

15

20

25

30

35

40

0 20 40 60 80 100 120 140 160 1800

5

10

15

20

25

30

35

40Data

b) = 0.1+ HB(t

t in t+W bkgtnon-t

]2) [GeV/c+M(H60 80 100 120 140 160

) = 1

.0s

c +

b) w

ith B

(H+

HB

(t

0

0.1

0.2

0.3

0.4

0.5

0.6 Observed @ 95% C.L.Expected @ 95% C.L.68% of SM @ 95% C.L.95% of SM @ 95% C.L.

Overall tt counts not constrained ! reduced sensitivity at MH ≈MW

Page 46: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Possible in various (more exotic) SM extensions

Benchmark model: SM couplings to vector bosons, no couplings to fermions

D0 analysis (4.2 fb-1):

Vh and VBF production lumpedtogether (no “V” selection)

NN γ identification

Fermiophobic Higgs: H →γγ

17

update from 2.7 fb-1

q(′)q̄

V !

h

V V !

V !h

W

Page 47: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Possible in various (more exotic) SM extensions

Benchmark model: SM couplings to vector bosons, no couplings to fermions

D0 analysis (4.2 fb-1):

Vh and VBF production lumpedtogether (no “V” selection)

NN γ identification

cut on pT(γγ)

Fermiophobic Higgs: H →γγ

17

update from 2.7 fb-1

(GeV)T

p0 50 100 150 200 250 300 350 400

Even

ts/5

GeV

-410

-310

-210

-110

1

data=110GeV)

fhVH (M

=110GeV)fh

VBF (M

preliminary-1DØ, 4.2 fb

q(′)q̄

V !

h

V V !

V !h

W

Page 48: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Possible in various (more exotic) SM extensions

Benchmark model: SM couplings to vector bosons, no couplings to fermions

D0 analysis (4.2 fb-1):

Vh and VBF production lumpedtogether (no “V” selection)

NN γ identification

cut on pT(γγ)

jj/γj identified usingknown fake rates

fit signal in 20 GeVmass window

Fermiophobic Higgs: H →γγ

17

update from 2.7 fb-1

q(′)q̄

V !

h

V V !

V !h

W

(GeV)M60 80 100 120 140 160 180

Even

ts/5

GeV

0

20

40

60

80

100

120

140

60 80 100 120 140 160 1800

20

40

60

80

100

120

140

datadirect

+jjj*->eeZ/

preliminary-1DØ, 4.2 fb

Page 49: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Possible in various (more exotic) SM extensions

Benchmark model: SM couplings to vector bosons, no couplings to fermions

D0 analysis (4.2 fb-1):

Vh and VBF production lumpedtogether (no “V” selection)

NN γ identification

cut on pT(γγ)

jj/γj identified usingknown fake rates

fit signal in 20 GeVmass window

(GeV)fhM

80 90 100 110 120 130 140 150

) (fb

) B

R(!

1

10

210

Observed LimitExpected LimitNLO prediction

1 "Expected Limit 2 "Expected Limit

preliminary-1DØ, 4.2 fb

(GeV)fhM

80 90 100 110 120 130 140 150

)BR

(

-310

-210

-110

1

Observed LimitExpected LimitNLO prediction

1 !Expected Limit 2 !Expected Limit

-1DØ, 1.1 fbLEP

preliminary-1DØ, 4.2 fb

Fermiophobic Higgs: H →γγ

17

update from 2.7 fb-1

q(′)q̄

V !

h

V V !

V !h

W

Page 50: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Fermiophobic Higgs: H →γγ

)2c (GeV/m0 100 200 300 400 500

2 cEn

trie

s/2

GeV

/

0

2

4

6

8

10

)2c (GeV/m0 100 200 300 400 500

2 cEn

trie

s/2

GeV

/

0

2

4

6

8

10

Central-Central

)2c (GeV/m0 50 100 150

)2 cA

rbitr

ary

/ 2 (G

eV/

SignalSimulation

)2c (GeV/m0 100 200 300 400 500

2 cEn

trie

s/2

GeV

/

0

2

4

6

8

10

12

)2c (GeV/m0 100 200 300 400 500

2 cEn

trie

s/2

GeV

/

0

2

4

6

8

10

12

Central-Plug

)2c (GeV/m0 50 100 150

)2 cA

rbitr

ary

/ 2 (G

eV/

SignalSimulation

(a)

(b)

Possible in various (more exotic) SM extensions

Benchmark model: SM couplings to vector bosons, no couplings to fermions

CDF analysis (3 fb-1):

Vh and VBF production lumpedtogether (as in D0 analysis)

pT(γγ) > 75 GeV

fit with 10 GeVsignal mass window

18

published

q(′)q̄

V !

h

V V !

V !h

W

Page 51: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Fermiophobic Higgs: H →γγPossible in various (more exotic) SM extensions

Benchmark model: SM couplings to vector bosons, no couplings to fermions

CDF analysis (3 fb-1):

Vh and VBF production lumpedtogether (as in D0 analysis)

pT(γγ) > 75 GeV

fit with 10 GeVsignal mass window

18

published

q(′)q̄

V !

h

V V !

V !h

W

)2c (GeV/hm70 80 90 100 110 120 130 140

)

h(

B

-310

-210

-110

1

)-1CDF limit (3.0 fbExpected limit1 sigma region2 sigma regionBenchmark predictionLEP limit

)2c (GeV/hm70 80 90 100 110 120 130 140

)

h(

B

-310

-210

-110

1

Page 52: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Four Fermion GenerationsStraightforward SM extension

evade Nν=3 constraint by heavy νenhanced gg→H cross section (factor 7.5 - 9)

Tevatron combined analysis (CDF 4.8 fb-1, D0 5.4 fb-1) adjusting corresponding SM H → W+W- search:

correct signal acceptance for different VH, VBF admixtures

19

t,b′, t′

submitted

-60-40-20

020406080

100

-2 -1.8 -1.6 -1.4 -1.2 -1 -0.8 -0.6 -0.4 -0.2 0log10(s/b)

Even

ts/0

.2 CDF+D0 Run II PreliminaryL=4.8 - 5.4 fb-1

mH=200 GeV

Data-BackgroundSignal±1 s.d. on Background

10-3

10-2

10-1

1

10

10 2

10 3

10 4

10 5

-2 -1.5 -1 -0.5 0 0.5 1log10(s/b)

Even

ts/0

.2 DataBackgroundSignal

CDF+D0 Run II PreliminaryL=4.8-5.4 fb-1

mH=200 GeV

Page 53: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Four Fermion GenerationsStraightforward SM extension

evade Nν=3 constraint by heavy νenhanced gg→H cross section (factor 7.5 - 9)

Tevatron combined analysis (CDF 4.8 fb-1, D0 5.4 fb-1) adjusting corresponding SM H → W+W- search:

correct signal acceptance for different VH, VBF admixtures

H → W+W- branching fraction affected by decays to heavy fermions ! 2 scenarios (both: mb´, mt´ ~ 400 - 500 GeV):

ml = 100 GeV, mν = 80 GeV

ml = mν = 1 TeV

19

t,b′, t′

submitted

Page 54: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Four Fermion GenerationsStraightforward SM extension

evade Nν=3 constraint by heavy νenhanced gg→H cross section (factor 7.5 - 9)

Tevatron combined analysis (CDF 4.8 fb-1, D0 5.4 fb-1) adjusting corresponding SM H → W+W- search:

correct signal acceptance for different VH, VBF admixtures

H → W+W- branching fraction affected by decays to heavy fermions ! 2 scenarios (both: mb´, mt´ ~ 400 - 500 GeV):

ml = 100 GeV, mν = 80 GeV

ml = mν = 1 TeV

19

t,b′, t′

submitted

0

1

2

3

4

120 140 160 180 200 220 240 2600

1

2

3

4

mH(GeV)

(gg

H)!

Br(H

WW

) (pb

)

CDF+D0 Run II PreliminaryL=4.8 - 5.4 fb-1

Expected 95% C.L. Limit

Observed 95% C.L. Limit

"1 s.d. Expected Limit

"2 s.d. Expected Limit

4G (infinite-mass)

4G (low-mass) Significantly increased exclusion regionlow mass: 131 GeV < MH < 204 GeVhigh mass: 131 GeV < MH < 208 GeV

Page 55: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

NMSSM Higgs PhenomenologyNMSSM: adds one gauge singlet superfield

preserves ρ=1

SSB: replaces μ (MSSM) with dimensionless coupling constant

Higgs sector:

additional CP-odd (a) and CP-even (h) Higgs boson

Allows for Higgs loophole at LEP:

SM-like h (within LEP kinematic reach), decaying mostly as h → aa

Ma < 2mb: a → ττ, gg, cc ! only looked for by OPAL in MSSM context

limited to mh < 86 GeV

20

Page 56: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

NMSSM: Charged Higgs BosonCDF analysis (2.7 fb-1): search in l+jets sample(regular tt event w/ extra τ+τ- pair)

soft τ’s ! identify through add’l isolated track

backgrounds:

underlying event (universal pT spectrum, check in l+1/2jet events)

Z/γ∗+jets (1 lepton missed or from τ decay)

21

(GeV/c)T

Lead Track p4 6 8 10 12 14 16 18 20

Even

ts P

er G

eV/c

210

310

410

510

(GeV/c)T

Lead Track p4 6 8 10 12 14 16 18 20

Even

ts P

er G

eV/c

210

310

410

510Data

*+Jet!Z/

Top and Diboson

Underlying Event

measurementll"*!0.03 times Z/± of 1.00*!Z/#Fit

Pre-Tag Lepton + 1 Jet Events

-1CDF Run II Preliminary, L=2.7fb

(GeV/c)T

Lead Track p4 6 8 10 12 14 16 18 20

Even

ts P

er G

eV/c

10

210

310

(GeV/c)T

Lead Track p4 6 8 10 12 14 16 18 20

Even

ts P

er G

eV/c

10

210

310

Data*+Jets!Z/

Top and Diboson

Underlying Event

measurementll"*!0.07 times Z/± of 1.03*!Z/#Fit

Pre-Tag Lepton + 2 Jet Events

-1CDF Run II Preliminary, L=2.7fb

new

Page 57: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

NMSSM: Charged Higgs BosonCDF analysis (2.7 fb-1): search in l+jets sample(regular tt event w/ extra τ+τ- pair)

soft τ’s ! identify through add’l isolated track

backgrounds:

underlying event (universal pT spectrum, check in l+1/2jet events)

Z/γ∗+jets (1 lepton missed or from τ decay)

21

(GeV/c)T

Lead Track p4 6 8 10 12 14 16 18 20

Even

ts P

er G

eV/c

0

10

20

30

40

50

(GeV/c)T

Lead Track p4 6 8 10 12 14 16 18 20

Even

ts P

er G

eV/c

0

10

20

30

40

50Data

2)=90, m(A)=9 GeV/c±Signal, m(H

SM Boson Daughter Tracks

Underlying Event

-1CDF Run II Preliminary, L=2.7fb

)=1!!"BR(Ab)=0.11±H"BR(t

A)=1±W"±BR(H

Fit as function of both ma and MH

UE normalisation inferred from b-tagged 3-jet datasignal shown at exclusion level

new

Page 58: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

NMSSM: Charged Higgs BosonCDF analysis (2.7 fb-1): search in l+jets sample(regular tt event w/ extra τ+τ- pair)

soft τ’s ! identify through add’l isolated track

backgrounds:

underlying event (universal pT spectrum, check in l+1/2jet events)

Z/γ∗+jets (1 lepton missed or from τ decay)

21

(GeV/c)T

Lead Track p4 6 8 10 12 14 16 18 20

Even

ts P

er G

eV/c

0

10

20

30

40

50

(GeV/c)T

Lead Track p4 6 8 10 12 14 16 18 20

Even

ts P

er G

eV/c

0

10

20

30

40

50 Data

2)=140, m(A)=7 GeV/c±Signal, m(H

SM Boson Daughter Tracks

Underlying Event

-1CDF Run II Preliminary, L=2.7fb

)=1!!"BR(Ab)=0.19±H"BR(t

A)=1±W"±BR(H

Fit as function of both ma and MH

UE normalisation inferred from b-tagged 3-jet datasignal shown at exclusion level

new

Page 59: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

NMSSM: Charged Higgs BosonCDF analysis (2.7 fb-1): search in l+jets sample(regular tt event w/ extra τ+τ- pair)

soft τ’s ! identify through add’l isolated track

backgrounds:

underlying event (universal pT spectrum, check in l+1/2jet events)

Z/γ∗+jets (1 lepton missed or from τ decay)

21

)2 mass (GeV/c±H90 100 110 120 130 140 150 160

b)± H

!BR

(t

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

-1CDF Run II Preliminary, L=2.7fb

Ab±W!b±H!95% CL Exclusion for t)=1""!BR(A )=1""!BR(A

A)=1±W!±BR(H 2m(A)=4 GeV/c Expected Observed 2m(A)=7 GeV/c Expected Observed 2m(A)=8 GeV/c Expected Observed 2m(A)=9 GeV/c Expected Observed

new

Page 60: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

NMSSM: Neutral Higgs Boson

D0 analysis (4.2 fb-1): search for gg → h → aa, with a → μ+μ-/τ+τ- in inclusive dimuon events (pT > 10 GeV)

2mμ < ma < 2mτ: muons too collinear to be reconstructed separately ! association with track (R < 1) only (NB: BF uncertain)

22

published

,track) (GeV)µ(1m0 0.5 1 1.5 2 2.5 3 3.5

,trac

k) (G

eV)

µ( 2m

0

0.5

1

1.5

2

2.5

3

3.5 -1, 4.2 fbOD

=3 GeVaM=1 GeVaM=.5 GeVaM=.2143 GeVaM

Data

(b)

tight (μ+track) isolation criteriaefficiency for collinear tracks from KS

σ(pp̄ → h + X ) · B(h → aa) · B(a → µ+µ−)2 < 10 fb

Page 61: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

NMSSM: Neutral Higgs Boson

D0 analysis (4.2 fb-1): search for gg → h → aa, with a → μ+μ-/τ+τ- in inclusive dimuon events (pT > 10 GeV)

2mμ < ma < 2mτ: muons too collinear to be reconstructed separately ! association with track (R < 1) only (NB: BF uncertain)

ma > 2mτ (μ+μ-τ+τ-): reconstruct a → μ+μ- candidates explicitly

use of muons ! low efficiency

22

published

Dimuon mass (GeV)0 2 4 6 8 10 12 14 16 18 20

Even

ts /

0.1

GeV

00.20.40.60.8

11.21.41.61.8

2 -1, 4.2 fbODDataBackgroundSignals

collimated τ not individually identified: ET / μ / ebackground estimated from low-ET region

/

/

Page 62: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

NMSSM: Neutral Higgs Boson

D0 analysis (4.2 fb-1): search for gg → h → aa, with a → μ+μ-/τ+τ- in inclusive dimuon events (pT > 10 GeV)

2mμ < ma < 2mτ: muons too collinear to be reconstructed separately ! association with track (R < 1) only (NB: BF uncertain)

ma > 2mτ (μ+μ-τ+τ-): reconstruct a → μ+μ- candidates explicitly

use of muons ! low efficiency

22

published

(GeV)aM4 6 8 10 12 14 16 18

aa) (

pb)

BR(

h!

h)

p(p

0123456789

10Observed limitExpected limitTheory

-1, 4.2 fbOD

(a)

(GeV)hM80 100 120 140 160 180 200

aa) (

pb)

BR(

h!

h)

p(p

0123456789

10

Observed limitExpected limitTheory

-1, 4.2 fbOD (b)

mh = 100 GeV ma = 4 GeV

Page 63: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Not DiscussedFermiophobic Higgs boson searches

CDF W±h → W±W+W- (2.7 fb-1)

D0 hhW± → γγγγW± (0.8 fb-1)

Doubly charged Higgs boson searches

D0 H++H-- → μ+μ+μ-μ- (1.1 fb-1)

CDF H++H-- → l+τ+l-τ- (0.3 fb-1)

23

Page 64: BSM Higgs Boson Searches at the Tevatron Collidermctp/SciPrgPgs/events/2010/Higgs/speaker talks/Filthaut.pdfSUSY 1 TeV 2 TeV 0.35 TeV 0.8 TeV tuned to maximize m h suppressed h →

Conclusion & Outlook

Consolidation in mainstream MSSM analyses

First MSSM combinations have been performed

Analyses with significantly larger datasets are underway

In the near future, the Tevatron will likely continue to play an important role in BSM Higgs physics

24