SM Higgs boson interaction with the Yukawa sector (tau, b) in CMS · 2018. 11. 21. · SM Higgs...

SMHiggsbosoninteractionwiththeYukawasector(tau,b)inCMS

MicheledeGruttola(CERN)onbehalfofCMScollaboration

EPS,Venice(IT)5-13July2017Wednesday, 5 July 17

/15

CMSH->tau,b:run1legacy

Evidencetodown-typefermions

currentmeasurementmainlyconstraintthecouplingtoup-typetopquark

- combineonlyVHbbandHττ

- drivenbyHττevidence

2

CMS-HIG-13-033Nature Phys. 10 (2014) 557-560

(GeV)Hm110 115 120 125 130 135

Loca

l p-v

alue

-610

-510

-410

-310

-210

-110

1

10

210

σ 0σ 1

σ 2

σ 3

σ 4

b b→VH (exp.) (obs.)ττ →VH (exp.) (obs.) (non-VH)ττ →H (exp.) (obs.)

Combined (exp.) (obs.)

CMS -120 fb− = 8 TeV, L = 19s; -1 = 7 TeV, L = 5 fbs

µ0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8

ln L

∆ 2

−

2

4

6

8

10

12

14

16

18

20

σ 1

σ 2

σ 3

σ 4

σ 5

σ2.1

σ3.2

σ3.8

= 125 GeVHmb b→VH

ττ →H Combined

CMS -120 fb− = 8 TeV, L = 19s; -1 = 7 TeV, L = 5 fbs

modelstandard

Probability for the background-only hypothesisto describe the data

Scan of the profile likelihood as a function of the signal strength

Wednesday, 5 July 17

http://dx.doi.org/10.1038/nphys3005

http://dx.doi.org/10.1038/nphys3005

/15

CMSH->bbrun1

Thethreepublicrun1CMSHbbresultshavebeencombined

VHbb

- updatedresultstoincludeggZHprocessinsignal

ttHbbBDTanalysis

VBFbb

3

Resultssignificance2.6σ(2.7expected)best-fittedµ=1.03+-0.43

CMS-HIG-14-004 10.1103/PhysRevD.92.032088

µ0 5

ln L

∆-2

0

2

4

6

8

Observedb b→H

b b→VH b b→vbf H

b b→ttH

CMS Unpublished (7 TeV)-1 (8 TeV) + 5.1 fb-119.8 fb

68% CL

95% CL

Likelihoodscansoftheobservedbest-fitsignalstrengthμ=σ/σSMforVH,VBFandttH

Higgs boson mass [GeV]115 120 125 130 135

Sign

ifican

ce

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

b b→H ExpectedObserved

CMS Unpublished (7 TeV)-1 (8 TeV) + 5.1 fb-119.8 fb

Expected and observed significances for a SM Higgs boson as a function of MH


http://dx.doi.org/10.1103/PhysRevD.92.032088

http://dx.doi.org/10.1103/PhysRevD.92.032088

/15

Outline

HiggscouplingtofermionsinCMSH->bb

- ggFnewinrun2

H->ττ

Newresultsinrun2andfutureprospect

4

Particle mass (GeV)0.1 1 10 100

1/2

/2v)

V o

r (g

fλ

-410

-310

-210

-110

1WZ

t

bτ

µ) fitε (M,

68% CL95% CL

68% CL95% CLSM Higgs

68% CL95% CLSM Higgs

CMS (7 TeV)-1 (8 TeV) + 5.1 fb-119.7 fb

Decay/Production ggF VBF VH ttH

H->ττ ✓ ✓ ✓ ✓

H->bb ✓ ✓ ✓ ✓

Analysis Document DataH->ττ HIG-16-043 35.9e-1(Full2016Data,run2)

VH->bb HIG-13-012 legacyrun1,run2comingsoon...

VBFH->bb HIG-16-003 2.32e-1run2

ttH->bb HIG-16-038 12.9e-1run2

ggH->bb HIG-17-010 35.9e-1(Full2016Data,run2)

FocusisonmostRecentresults.H->ττhasbeenupdatedwithfull2016luminosityonlySMHresultsherenewCMSggH->bbcoveredintalkbyC.VernierittHbbcoveredinD.Salernotalk

https://arxiv.org/pdf/1610.07922.pdf




/15

H->ττ(HIG-16-043)

H->ττisthecleanestchannelforstudyingtheYukawacouplingslessbackgroundthanH->bb

4taudecaychannels(eτ,μτ,eμ,ττ)eachwith3eventcategories(0-jet,VBF,Boosted).

run2analysisisdoneextractingthesignalin2-dimensionsmττ+2ndchosentargetingspecificprodmodes(τdecay,di-jetmass,higgspT)

VHincludedassignal,butnottargetedbyseparatecategory.FullVHwillcomelater

5


/15

H->ττ:svFitMass

mττisreconstructedusingSVFit(dynamicallikelihoodtechniques)inmostcategories

AllowsforsomeseparationofZ→ττandH→ττ,andshifttheH→ττpeakto125GeV.

inputsare

Missingtransverseenergy(MET)

METuncertainty

eachtaucandidate’sfourvector.

- AssumesallMETintheeventisfromneutrinosintaudecay

6

mass distribution (GeV)ττ→H0 50 100 150 200 250

arbi

trary

uni

ts

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.1813 TeV

CMS SimulationPreliminary vism

ττm


/15

2Dbinneddistributions

7

(GeV)vism60 80 100 120

Prob

abilit

y de

nsity

0.01

0.02

0.03

0.04

0.05

0.06

0.0713 TeVCMS Simulation Preliminary

)hτµ (0jet, ττ→ggH

1 pr

ong

0 π1

pron

g +

3 pr

ongs

(GeV)ττm50 100 150 200

(GeV

)jj

m400

600

800

1000

1200

1400

1600

1800

Prob

abilit

y de

nsity

0

0.01

0.02

0.03

0.04

0.05

13 TeVCMS Simulation Preliminary

)hτµ (VBF, ττ→qqH

(GeV)ττm50 100 150 200

(GeV

)ττ Tp

0

50

100

150

200

250

300

350

400

Prob

abilit

y de

nsity

0

0.005

0.01

0.015

0.02

0.025

0.03

0.03513 TeVCMS Simulation Preliminary

)hτµ (boosted, ττ→ggH

(GeV)vism60 80 100 120

Prob

abilit

y de

nsity

0

0.05

0.1

0.15

0.2

0.25

0.3


)hτµ (0jet, µµ→Z

1 pr

ong

0 π1

pron

g +

3 pr

ongs

(GeV)ττm50 100 150 200

(GeV

)jj

m

400

600

800

1000

1200

1400

1600

1800

Prob

abilit

y de

nsity

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16


)hτµ (VBF, ττ→Z

(GeV)ττm50 100 150 200

(GeV

)ττ Tp

0

50

100

150

200

250

300

350

400

Prob

abilit

y de

nsity

0

0.002

0.004

0.006

0.008

0.01

0.012

0.014

0.016

0.018

0.02

0.022


)hτµW+jets (boosted,


/15

Backgroundsestimation

8

(13 TeV)-1 35.9 fbhτµ

CMSPreliminary

(GeV)Tm0 20 40 60 80 100120140160180

Even

ts

0

10000

20000

30000

40000

50000

60000

70000

80000Observed

ττ→Zµµ→Z

ElectroweakQCD multijettt

(13 TeV)-1 35.9 fbhτµ

CMSPreliminary


/15

Unrolled2D

9

channel category

exampleforττboostedcategory

Redlineispullw.r.t.tobackground

(GeV)ττm

0-40

40-6

060

-70

70-8

080

-90

90-1

0010

0-11

011

0-12

012

0-13

013

0-15

015

0-20

020

0-25

00-

4040

-60

60-7

070

-80

80-9

090

-100

100-

110

110-

120

120-

130

130-

150

150-

200

200-

250

0-40

40-6

060

-70

70-8

080

-90

90-1

0010

0-11

011

0-12

012

0-13

013

0-15

015

0-20

020

0-25

00-

4040

-60

60-7

070

-80

80-9

090

-100

100-

110

110-

120

120-

130

130-

150

150-

200

200-

250Bk

g. u

nc.

(Obs

. - b

kg.)

2−024

Even

ts/b

in

1−10

1

10

210

310

410 < 100 GeVττ

T0 < p < 170 GeVττ

T100 < p < 300 GeVττ

T170 < p > 300 GeVττ

Tp

(13 TeV)-135.9 fbCMS Preliminary , Boostedhτhτ

Observed

= 1.06)µ (ττ→H

ττ→Z

/eeµµ→Z

+jetstt

W+jets

QCD multijet

Others

Total unc.

= 1.06)µ (ττ→H

Bkg. unc.Obs. - bkg.

Bkg. unc.ττ→H

Bkg. unc.

100<ptττ<170 170<pt

ττ<300


/15

H->ττ:results

10

Best Fit signal strength : 1.06 ± 0.25

log(S/S+B) plot has been made from every bin from the unrolled 2-Ddistributions

Expected (postfit) significance is 4.7 σ

Observed significance is 4.9 σ

log(S/(S+B))3− 2.5− 2− 1.5− 1− 0.5− 0

Even

ts

1−10

1

10

210

310

410

510

610

710

ττ→Z µµee/→Z

+jetstt W+jets

QCD multijet Others

=1.06)µ (ττ→H Bkg. unc.

Observed

(13 TeV)-135.9 fb

CMSPreliminary

log(S/(S+B))1.5− 1− 0.5−

00.20.40.60.8

11.21.41.61.8

(Obs. - bkg.)/bkg.)/bkg.ττ→(H

Bkg. unc.

SMσ/σ = µBest fit

0 1 2 3

0-jet -0.82 +0.90.82

Boosted -0.37 +0.41.11

VBF -0.29 +0.311.07

Combined -0.24 +0.251.06

CMSPreliminary

(13 TeV)-135.9 fb


/15

H->bbH->bbhasthelargestbranchingfraction@125GeV:58%

LargeQCD-inducedbbbackgrounds(overwhelmingforggH)

VHandttH:(semi)leptonicdecaychannels

- lowercrosssection,butpureQCDbackgroundisnotdominant

VBF:2q2bfinalstate

- highercrosssection,butQCDbackgroundirreducible

- approachwithdedicatedtriggers

ggH->bbthoughttobeimpossible,

- butnewsophisticatedanalysisinCMSdisproveit,seeC.Vernieri

11 [GeV] HM100 200 300 400 500 1000

H+X

) [pb

]

�(p

p �

-210

-110

1

10= 7 TeVs

LHC

HIG

GS

XS W

G 2

010

H (NNLO+NNLL QCD + NLO EW)

�pp

qqH (NNLO QCD + NLO EW)

�pp

WH (NNLO QCD + NLO EW)

�pp

ZH (NNLO QCD +NLO EW)

�pp

ttH (NLO QCD)

�pp

[GeV]HM80 100 120 140 160 180 200

Hig

gs B

R +

Tot

al U

ncer

t

-410

-310

-210

-110

1

LHC

HIG

GS

XS W

G 2

013

bb

oo

µµ

cc

gg

aa aZ

WW

ZZ


/15

VBF->bbHIG-16-003

12

HIG-16-003Ev

ents

/ 0.

02

-310

-110

10

310

510

710810 (13 TeV)-12.32 fbCMS

SingleBPreliminary

Data

VBF, m(H) = 125 GeV

GF, m(H) = 125 GeV

H, m(H) = 125 GeVtt

1.10)×QCD (

tt

W + jets

Z + jets

Single t

MC stat. unc.

BDT output-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1D

ata

/ MC

- 1

-1-0.5

00.5

1 fit mbb in each category

Even

ts /

5.0

GeV

68

101214161820222426

(GeV)bbm80 100 120 140 160 180 200

Dat

a - B

kg

-15-10-505

1015

CAT 4Data

= 125 GeV)H

(mBkg.QCD

bkg. unc.σ2 bkg. unc.σ1

CMS (13TeV)-12.32 fbPreliminary


/15

run2:H->ττhasbeenupdatedwithfull2016luminosity.

ObservationofStandardModelH->ττwith4.9sigmaexcess!!!

HbbaddingggHtootherprodmodesrun2statisticsonhandwillexceedrun1resultandlikelytocloseuponobservationAnotherproductionyearofLHChasjuststartedwithupgradedPixelandForwardHadronicdetectorsinCMS.

Conclusionsandprospects....

13


BACKUPWednesday, 5 July 17

/15

H->bb:ttHbbHIG-16-038

Searchinleptons+jetsanddileptonchannelMainbackgrounds:tt+(bb/cc/lightquarks/b/t),tt+V,W/Z+jets,diboson&QCD

AnalysisstrategyLookforhighjetmultiplicityandmanybtags,ClassifyeventsinNjetandNbjetsbins

15

see more details in talk by Daniel Salerno


/15

ttH->bbresults

16

see more details in talk by Daniel Salerno


/15

yes,theHiggsbosoninteractswithmatter!

17


ggZH


/15

func(Xsection*BR,eff,bkgs)

19

[GeV] HM100 200 300 400 500 1000

H+X

) [pb

]

�(p

p �

-210

-110

1

10= 7 TeVs

LHC

HIG

GS

XS W

G 2

010

H (NNLO+NNLL QCD + NLO EW)

�pp

qqH (NNLO QCD + NLO EW)

�pp

WH (NNLO QCD + NLO EW)

�pp

ZH (NNLO QCD +NLO EW)

�pp

ttH (NLO QCD)

�pp

AssociationwithZ/W

Associationwithttbar Hàbb

overwhelmingQCD:needtogowithassociatedproduction,§VH-canuselepton/METandtopology§ttH-evenlessrate,lookattopology,butttbarbkgwellunderstood§VBFrecentlyadded

Hàττ§gluonfusiondifficultbutpossible(canuseassociationwithjetsorgotohighptregime)§VBFcleaner§VHandttHalsoaddedveryimportantforstudyHiggsproperties!

Vectorbosonfusion

g-gfusion


/15

[GeV]HM80 100 120 140 160 180 200

Hig

gs B

R +

Tot

al U

ncer

t

-410

-310

-210

-110

1

LHC

HIG

GS

XS W

G 2

013

bb

oo

µµ

cc

gg

aa aZ

WW

ZZ

SM#BR#theory#uncertain1es##245%#for#most#important#ones#

mH=125.09#GeV#Regionofinterest

20

b’sandtau’sßtesttheHiggscouplingstofermionsvsbosons

VitalpartoftheHiggsidentificationandHiggspropertystudies

Butlifeishard…

But σbb(QCD) ~ 107 σxBR(Hàbb)!


/15

VBFaddendum

21


Other production processes •  ggZH:%%

–  O(10%)%effect%on%VHbb%in%SM,%higher%pT%than%qqZH%

%%

%

%

•  tHq%+%tHW%–  Not%really%sensiDve%but%has%larger%effects%for%negaDve%couplings%%

%

%%

•  bbH%–  Similar%to%IH%but%not%really%disDnguishable%from%ggF%

Sep%1,%2015% Marco%Pieri%UC%San%Diego% 11%

otherptoductionmechanisms


/15

VHbbstrategy

23

•5channels:–Z(ll)Hbb–Z(νν)Hbb–W(lν)Hbb

Generalstrategy:

(a)Highboostedvectorbosonanddijet,(b)2b-taggedjets,(c)back-to-backV&H(d)Reconstructmbb

First CMS VHbb 2011 analysis Phys. Lett. B 710(2012) 284-306

ZH->µµbbcandidate

Mbb =128GeVpT(bb)=181GeV

AssociatedProduc.onàfinalstateswithleptons,METandb-jets

b-jetCSV~0.99

b-jetCSV~0.92

H->bb


/15

• alsonew2012– Improved tau ID and new mass reconstructions (20% better mass resolution)

Mττresolution

24

2011analysisinPLB:Phys.Lett.B713(2012)68-90

– Event-by-eventestimatoroftruem(ττ)likelihoodusingmomentaofvisibledecayproducts,anglesandMETdirectionsandexpectedresolution

L= ×

H/Zseparation

[GeV]vism0 50 100 150 200 250

[1/G

eV]

vis

1/dm

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0.2 = 125 GeVH mττ →H

ττ →Z

= 8 TeVsCMS Simulation hτµ

[GeV]ττm0 50 100 150 200 250

[1/G

eV]

ττ1/

dm

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16 = 125 GeVH mττ →H

ττ →Z

= 8 TeVsCMS Simulation hτµ

visible mass

estimated mττ

METx

exp resolution

METy

exp resolution

H->ττ


SM Higgs boson interaction with the Yukawa sector (tau, b) in CMS · 2018. 11. 21. · SM Higgs...

Documents

Transcript of SM Higgs boson interaction with the Yukawa sector (tau, b) in CMS · 2018. 11. 21. · SM Higgs...