22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 1

Overview

bull R-parity violating Supersymmetrybull Cross section and Run I Limitbull Data Selection amp Efficienciesbull Control plotsbull First Results

Search for RPV Susy through the LQD coupling λrsquo211

Christian AutermannIII Physikalisches Institut A

RWTH Aachen

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 2

R-parity Violating Supersymmetry

baiabi

czk

cyj

cxixyzijk

ck

bj

aiabijk

ck

bj

aiabijkR

RMSSM

HLDDUDQLELLW

WWW

P

P

2

2

1

SLBPR 23)1( parity-R

References H Dreiner etal Search for R-Parity Violation at Run-II of the Tevatron hep-ph9906224 NGhodbane SKatsanevas PMorawitz EPerez SUSYGEN 3 hep-ph9909499

ijk = 123 generation indices

Chiral superfieldsL lepton doublet superfieldQ quark doublet superfieldD down-like quark singlet superfield

λ λ` λ`` Yukawa couplings

Resonant production

Assuming a non-zero λ`211 coupling leads to muon (2nd gen) and two jets (1st gen) final states

tri-lepton channelAnne-Marie Daniela

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 2

R-parity Violating Supersymmetry

baiabi

czk

cyj

cxixyzijk

ck

bj

aiabijk

ck

bj

aiabijkR

RMSSM

HLDDUDQLELLW

WWW

P

P

2

2

1

SLBPR 23)1( parity-R

References H Dreiner etal Search for R-Parity Violation at Run-II of the Tevatron hep-ph9906224 NGhodbane SKatsanevas PMorawitz EPerez SUSYGEN 3 hep-ph9909499

ijk = 123 generation indices

Chiral superfieldsL lepton doublet superfieldQ quark doublet superfieldD down-like quark singlet superfield

λ λ` λ`` Yukawa couplings

Resonant production

Assuming a non-zero λ`211 coupling leads to muon (2nd gen) and two jets (1st gen) final states

tri-lepton channelAnne-Marie Daniela

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 3

Neutralino Production amp Decay

production decay

Final statetwo (isolated) muonstwo jets

Other modesbull sneutrino resonance 2 jets MET amp perh 1 μbull neutralino pair production and decay over λ`211

bull t-channel slepton exchange

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 4

Slepton Production x-section

Run I slepton production cross section 334 pb (SUSYGEN λrsquo211=009 mslepton=269GeV)

Susygen with Suspect interface had a bug in older versions ( )σ SUSYGEN 30016 68 pb (SUSPECT) σ=1059 pbσ SUSYGEN 30043 224 pb (SUSPECT) σ= 349 pb

22

2

22

211 )()(

12dxdQQxF

dQdx

Qx

s

For λrsquo211=009 mslepton=269GeV and

σ=296 pbGeV 1800s

σ=347 pbGeV 1960s

GeV 1960s

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 5

Exclusion Contour

DOslash Collaboration PhysRevLetter 89 (2002) hep-ex0111053

This talk

1

02βtan

0A

243m

200m

0

21

0

GeV

GeV

mSUGRA parametersm0 universal soft breaking mass parameter for scalars m12 universal soft braking mass parameter for gauginosA0 trilinear coupling term sign(μ) higgs mass mixing parametertan(β) ratio of the vacuum expectation of the neutral higgs fields

m0 m12 and A0 are defined at the GUT scale

DOslash Run I

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 4

Slepton Production x-section

Run I slepton production cross section 334 pb (SUSYGEN λrsquo211=009 mslepton=269GeV)

Susygen with Suspect interface had a bug in older versions ( )σ SUSYGEN 30016 68 pb (SUSPECT) σ=1059 pbσ SUSYGEN 30043 224 pb (SUSPECT) σ= 349 pb

22

2

22

211 )()(

12dxdQQxF

dQdx

Qx

s

For λrsquo211=009 mslepton=269GeV and

σ=296 pbGeV 1800s

σ=347 pbGeV 1960s

GeV 1960s

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 5

Exclusion Contour

DOslash Collaboration PhysRevLetter 89 (2002) hep-ex0111053

This talk

1

02βtan

0A

243m

200m

0

21

0

GeV

GeV

mSUGRA parametersm0 universal soft breaking mass parameter for scalars m12 universal soft braking mass parameter for gauginosA0 trilinear coupling term sign(μ) higgs mass mixing parametertan(β) ratio of the vacuum expectation of the neutral higgs fields

m0 m12 and A0 are defined at the GUT scale

DOslash Run I

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 5

Exclusion Contour

DOslash Collaboration PhysRevLetter 89 (2002) hep-ex0111053

This talk

1

02βtan

0A

243m

200m

0

21

0

GeV

GeV

mSUGRA parametersm0 universal soft breaking mass parameter for scalars m12 universal soft braking mass parameter for gauginosA0 trilinear coupling term sign(μ) higgs mass mixing parametertan(β) ratio of the vacuum expectation of the neutral higgs fields

m0 m12 and A0 are defined at the GUT scale

DOslash Run I

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 6

Data Sample amp Preselection

bull Total delivered L=209pb-1 good amp reconstructed L=154pb-1 bull Data taking period April 2002 ndash September 2003bull Di-muon data sample ~4 of all data

bull Re-skim (6 of di-muon sample 297k events) 2 muons with ptgt5 GeV and ptgt3 GeV and a good central track match Anti cosmic cuts |t_A|lt10ns -15nslt|t_B|lt10ns 2 jets with each ptgt10 GeV and |eta|lt25

bull Preselection Di-muon trigger has fired [2MU_A_L2M0 || 2MU_A_L2M0_TRK5 ||

2MU_A_L2M0_TRK10 || 2MU_A_L2M0_L3L6 || 2 MU_A_L2M0_L3L15] goodbad run selection central track match amp isolation for both muons 1 muon ptgt20 GeV 1 muon ptgt8 GeV 1 jet ptgt20 GeV 1 jet ptgt15 GeV di-muon angle ΔRmu1mu2gt10 to reject QCD events 645 events

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 7

Isolation Efficiency

εData = 0942 εMC

εData = 817εMC = 869

cone core

SRC track

hollow cone Σ ET lt Eisoi

i

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 8

Di-Muon Trigger Efficiency

TriggerEfficiency Class(Brigitte Vachon top group)

Weight all MC events with respect to muon jet MET and data luminosity so that all di-muon trigger inefficiencies are described

pT of 2 muon [GeV]

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 9

μ [GeV]

1

1

1

12

1

3

1 10 102 103

k fa

ctor

2

)(

3

41

3

41 2 Sk

x-sections from Pythia is only LOThe ldquok factorrdquo is a common correction

weight Z-MC events with k(Mμμ)

LONLOk

additional correction

LONLOk

References bull R Hamberg et al A COMPLETE CALCULATION OF THE ORDER ALPHA-S2 CORRECTION TO THE DRELL-YAN K FACTOR NuclPhysB359343-4051991 bull K Hagiwara et al Particle Data Group Phys Rev D 66 010001 (2002)

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 7

Isolation Efficiency

εData = 0942 εMC

εData = 817εMC = 869

cone core

SRC track

hollow cone Σ ET lt Eisoi

i

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 8

Di-Muon Trigger Efficiency

TriggerEfficiency Class(Brigitte Vachon top group)

Weight all MC events with respect to muon jet MET and data luminosity so that all di-muon trigger inefficiencies are described

pT of 2 muon [GeV]

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 9

μ [GeV]

1

1

1

12

1

3

1 10 102 103

k fa

ctor

2

)(

3

41

3

41 2 Sk

x-sections from Pythia is only LOThe ldquok factorrdquo is a common correction

weight Z-MC events with k(Mμμ)

LONLOk

additional correction

LONLOk

References bull R Hamberg et al A COMPLETE CALCULATION OF THE ORDER ALPHA-S2 CORRECTION TO THE DRELL-YAN K FACTOR NuclPhysB359343-4051991 bull K Hagiwara et al Particle Data Group Phys Rev D 66 010001 (2002)

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 8

Di-Muon Trigger Efficiency

TriggerEfficiency Class(Brigitte Vachon top group)

Weight all MC events with respect to muon jet MET and data luminosity so that all di-muon trigger inefficiencies are described

pT of 2 muon [GeV]

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 9

μ [GeV]

1

1

1

12

1

3

1 10 102 103

k fa

ctor

2

)(

3

41

3

41 2 Sk

x-sections from Pythia is only LOThe ldquok factorrdquo is a common correction

weight Z-MC events with k(Mμμ)

LONLOk

additional correction

LONLOk

References bull R Hamberg et al A COMPLETE CALCULATION OF THE ORDER ALPHA-S2 CORRECTION TO THE DRELL-YAN K FACTOR NuclPhysB359343-4051991 bull K Hagiwara et al Particle Data Group Phys Rev D 66 010001 (2002)

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 9

μ [GeV]

1

1

1

12

1

3

1 10 102 103

k fa

ctor

2

)(

3

41

3

41 2 Sk

x-sections from Pythia is only LOThe ldquok factorrdquo is a common correction

weight Z-MC events with k(Mμμ)

LONLOk

additional correction

LONLOk

References bull R Hamberg et al A COMPLETE CALCULATION OF THE ORDER ALPHA-S2 CORRECTION TO THE DRELL-YAN K FACTOR NuclPhysB359343-4051991 bull K Hagiwara et al Particle Data Group Phys Rev D 66 010001 (2002)

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 10

Control Plots of the Data Sample (1)

PT for the most energetic muon Invariant di-muon mass

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 11

Control Plots of the Data Sample (2)

PT for the most energetic jet Inv mass of muon1 muon2 jet1 amp jet2

After pre-selection amp corrections485 data events487 background events expected426 signal events expected

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 12

Signal MonteCarlo (SUSYGEN)

Invariant mass of2 jets and 2 muons

Invariant mass of2 jets and the lower energetic muon

muon is from -decaymuon is from μ-decayneither nor

~~

Generated with Susygenand passed throughfull detector simulation ampreconstruction

mass = 102 GeVmass μ = 262 GeV

~~

01

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 13

Final Cuts

variable cut background

rejection

signal

loss

μ1 pT 20 GeV 40 GeV 276 24

μ2 pT 8 GeV 10 GeV 24 20

jet1 pT 20 GeV 25 GeV 204 10

M (μ1 μ2) excl Z0 (76 GeV ndash 106 GeV) 737 275

M (jet1 jet2) 30 lt M lt infin GeV 125 34

M (μ1 jet1 jet2) 130 lt M lt 300 GeV 465 84

M (μ2 jet1 jet2) [0] 70 lt M lt 130 GeV 556 162

M (μ1 μ2 jet1 jet2) [μ] 190 lt M lt 300 GeV 583 253

total [relative to preselection] 991 705

~1

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 14

Signal Region (preliminary)

good agreement between data and standard model background

Inv di-muon mass Inv mass of muon1 muon2 jet1 amp jet2

Final cut to remove the remainingZ0 background

42 events expected3 data events found(124 signal events)

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 15

Conclusion And Plans

bull Preselected data agrees reasonable well with background

described by Pythia ZDY incl MC

bull In the final sample 54 background events are expected and

3 data events have been found

Donrsquot reject QCD events by cutting on the angle between the

two muons in the pre-selection Scan Susy parameter space Apply a more ldquosophisticatedrdquo final selection

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 11

Control Plots of the Data Sample (2)

PT for the most energetic jet Inv mass of muon1 muon2 jet1 amp jet2

After pre-selection amp corrections485 data events487 background events expected426 signal events expected

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 12

Signal MonteCarlo (SUSYGEN)

Invariant mass of2 jets and 2 muons

Invariant mass of2 jets and the lower energetic muon

muon is from -decaymuon is from μ-decayneither nor

~~

Generated with Susygenand passed throughfull detector simulation ampreconstruction

mass = 102 GeVmass μ = 262 GeV

~~

01

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 13

Final Cuts

variable cut background

rejection

signal

loss

μ1 pT 20 GeV 40 GeV 276 24

μ2 pT 8 GeV 10 GeV 24 20

jet1 pT 20 GeV 25 GeV 204 10

M (μ1 μ2) excl Z0 (76 GeV ndash 106 GeV) 737 275

M (jet1 jet2) 30 lt M lt infin GeV 125 34

M (μ1 jet1 jet2) 130 lt M lt 300 GeV 465 84

M (μ2 jet1 jet2) [0] 70 lt M lt 130 GeV 556 162

M (μ1 μ2 jet1 jet2) [μ] 190 lt M lt 300 GeV 583 253

total [relative to preselection] 991 705

~1

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 14

Signal Region (preliminary)

good agreement between data and standard model background

Inv di-muon mass Inv mass of muon1 muon2 jet1 amp jet2

Final cut to remove the remainingZ0 background

42 events expected3 data events found(124 signal events)

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 15

Conclusion And Plans

bull Preselected data agrees reasonable well with background

described by Pythia ZDY incl MC

bull In the final sample 54 background events are expected and

3 data events have been found

Donrsquot reject QCD events by cutting on the angle between the

two muons in the pre-selection Scan Susy parameter space Apply a more ldquosophisticatedrdquo final selection

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 12

Signal MonteCarlo (SUSYGEN)

Invariant mass of2 jets and 2 muons

Invariant mass of2 jets and the lower energetic muon

muon is from -decaymuon is from μ-decayneither nor

~~

Generated with Susygenand passed throughfull detector simulation ampreconstruction

mass = 102 GeVmass μ = 262 GeV

~~

01

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 13

Final Cuts

variable cut background

rejection

signal

loss

μ1 pT 20 GeV 40 GeV 276 24

μ2 pT 8 GeV 10 GeV 24 20

jet1 pT 20 GeV 25 GeV 204 10

M (μ1 μ2) excl Z0 (76 GeV ndash 106 GeV) 737 275

M (jet1 jet2) 30 lt M lt infin GeV 125 34

M (μ1 jet1 jet2) 130 lt M lt 300 GeV 465 84

M (μ2 jet1 jet2) [0] 70 lt M lt 130 GeV 556 162

M (μ1 μ2 jet1 jet2) [μ] 190 lt M lt 300 GeV 583 253

total [relative to preselection] 991 705

~1

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 14

Signal Region (preliminary)

good agreement between data and standard model background

Inv di-muon mass Inv mass of muon1 muon2 jet1 amp jet2

Final cut to remove the remainingZ0 background

42 events expected3 data events found(124 signal events)

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 15

Conclusion And Plans

bull Preselected data agrees reasonable well with background

described by Pythia ZDY incl MC

bull In the final sample 54 background events are expected and

3 data events have been found

Donrsquot reject QCD events by cutting on the angle between the

two muons in the pre-selection Scan Susy parameter space Apply a more ldquosophisticatedrdquo final selection

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 13

Final Cuts

variable cut background

rejection

signal

loss

μ1 pT 20 GeV 40 GeV 276 24

μ2 pT 8 GeV 10 GeV 24 20

jet1 pT 20 GeV 25 GeV 204 10

M (μ1 μ2) excl Z0 (76 GeV ndash 106 GeV) 737 275

M (jet1 jet2) 30 lt M lt infin GeV 125 34

M (μ1 jet1 jet2) 130 lt M lt 300 GeV 465 84

M (μ2 jet1 jet2) [0] 70 lt M lt 130 GeV 556 162

M (μ1 μ2 jet1 jet2) [μ] 190 lt M lt 300 GeV 583 253

total [relative to preselection] 991 705

~1

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 14

Signal Region (preliminary)

good agreement between data and standard model background

Inv di-muon mass Inv mass of muon1 muon2 jet1 amp jet2

Final cut to remove the remainingZ0 background

42 events expected3 data events found(124 signal events)

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 15

Conclusion And Plans

bull Preselected data agrees reasonable well with background

described by Pythia ZDY incl MC

bull In the final sample 54 background events are expected and

3 data events have been found

Donrsquot reject QCD events by cutting on the angle between the

two muons in the pre-selection Scan Susy parameter space Apply a more ldquosophisticatedrdquo final selection

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 14

Signal Region (preliminary)

good agreement between data and standard model background

Inv di-muon mass Inv mass of muon1 muon2 jet1 amp jet2

Final cut to remove the remainingZ0 background

42 events expected3 data events found(124 signal events)

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 15

Conclusion And Plans

bull Preselected data agrees reasonable well with background

described by Pythia ZDY incl MC

bull In the final sample 54 background events are expected and

3 data events have been found

Donrsquot reject QCD events by cutting on the angle between the

two muons in the pre-selection Scan Susy parameter space Apply a more ldquosophisticatedrdquo final selection

22 April 2004 New Phenomena Meeting Christian Autermann - Resonant Slepton Production 15

Conclusion And Plans

bull Preselected data agrees reasonable well with background

described by Pythia ZDY incl MC

bull In the final sample 54 background events are expected and

3 data events have been found

Donrsquot reject QCD events by cutting on the angle between the

two muons in the pre-selection Scan Susy parameter space Apply a more ldquosophisticatedrdquo final selection