Christian Autermann III. Physikalisches Institut A RWTH Aachen · July 2004, New Phenomena Meeting...

1 July 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 Distribution after final cutsbull Results

Search for RPV Susy through the LQD coupling λrsquo211

Christian AutermannIII Physikalisches Institut A

RWTH Aachen


R-parity Violating Supersymmetry

baiabi

czk

cyj

cxixyzijk

ck

bj

aiabijk

ck

bj

aiabijkR

RMSSM

HLDDUDQLELLW

WWW

P

P

2

2

1 εκελελελ +++=

+=

SLBPR 23)1( parity-R ++minus=

ReferencesH 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


Neutralino Production amp Decay

production decay

Final statetwo (isolated) muonstwo jets

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

bull t-channel slepton exchange


Run I Exclusion Contour

DOslash Collaboration PhysRevLetter 89 (2002) hep-ex0111053

( )

1

02βtan

0A0

minus=

==

micromicro

mSUGRA parametersm0 universal soft breaking mass

parameter for scalars m12 universal soft braking mass

parameter for gauginosA0 trilinear coupling term sign(micro) 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

Plots for this point

Limits forMχ = 75 100 GeV ampMmicro = 200 300 GeV

~

~


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 PreselectionDi-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 selectioncentral track match amp isolation for both muons1 muon ptgt20 GeV 1 muon ptgt8 GeV1 jet ptgt15 GeV 1 jet ptgt10 GeV di-muon angle ∆Rmu1mu2gt10 to reject QCD events

rarr 666 events


Isolation Efficiency

εData = 0942 εMC

εData = 817εMC = 869

cone core

SRC track

hollow cone Σ ET lt Eisoi

i


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

Estimate systematic error by varying the correction factor by plusmn1 σ

pT of 2 muon [GeV]


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

rarr weight Z-MC events with k(Mmicromicro)

L ONL Ok σσ sdot=

additional correction

[GeV])γ(Z10 10

210

3

k-fa

cto

r

1

12

14

16

18

2

+ 100 MeVΛNLO

= 209 MeVΛNLO

- 100 MeVΛNLO

NNLO CTEQ6

NNLO CTEQ5

Correction Factor K for LO ZDY x-section

πmicroαπ

2

)(

3

41

3

41 2 S

NLOk sdot

++=

LONLOk σσ sdot=

Referencesbull 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) bull T Nunnemann D0 Note 4476

NNLO

NNLO correction with CTEQ6is used to weight the Zγ


Control Plots of the Data Sample (1)

PT for the most energetic muon PT for the second energetic muon sum of PT of muon

Angle between both muons Angle between both muons






Final Cuts

cut range pT micro1 gt 2125 GeV + 1580 (Mmicro - Mχ)pT micro1 + pT micro2 gt 60 GeVjet1 pT gt 25 GeVmissing ET lt 60 GeV

π ndash 1 lt ∆φ (micro1jeti) lt π + 105 lt ∆φ (micro2jeti) lt 2591 GeV-5Mχ lt inv Mmicromicro lt 91 GeV+5MχMχ ndash 30 GeV lt inv Mmicro2jet1jet2 lt Mχ + 30 GeVMmicro ndash 02Mmicro lt inv Mmicro1micro2jet1jet2lt Mmicro + 02Mmicro

Details on the cut flow can be found in Note 4485bull There remain about 20 more data events than expected SM events

after the cut on the inv di-muon mass is appliedbull I am investigating this currently


Signal MonteCarlo (SUSYGEN)

Invariant mass of2 jets and 2 muons

Invariant mass of2 jets and the lower energetic muon

muon is from χ-decaymuon is from micro-decayneither nor

~

~

Generated with Susygenand passed throughfull detector simulation ampreconstruction

mass χ = 102 GeVmass micro = 262 GeV

~~

01


Signal Region (mχ=102GeV mmicro=263GeV)

rarr good agreement between data and standard model background

Cut to remove the remainingZ0 background

~ ~1

Inv di-muon mass

After all cuts for thismSUGRA point21 events expected1 data events found(37 signal events)

Inv mass of muon1 muon2 jet1 amp jet2


Signal Efficiencies

constant slepton mass (200 300 GeV) constant neutralino mass (75 100 GeV)

The neutralino decays only with ~50 prop to two muons and two jets


Signal x-section and Limit

mmicrolt265 GeV~


Conclusion And Plans

bull Preselected data agrees well with background

described by Pythia (Zγ) incl MC

bull Exclusion Limits with 95 CL have been presented in

absence of an excess in the data

rarr Consider the systematic error of muon and jet pt smearing

rarr Improve signal efficiency Optimize cuts

rarr Donrsquot reject QCD events by cutting on the angle between the

two muons in the pre-selection

rarr Apply a more ldquosophisticatedrdquo final selection

DOslash Note 4485 with more detailed information is available


R-parity Violating Supersymmetry

baiabi

czk

cyj

cxixyzijk

ck

bj

aiabijk

ck

bj

aiabijkR

RMSSM

HLDDUDQLELLW

WWW

P

P

2

2

1 εκελελελ +++=

+=

SLBPR 23)1( parity-R ++minus=

ReferencesH 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



production decay







( )

1

02βtan

0A0

minus=

==

micromicro






DOslash Run I



~

~







rarr 666 events



εData = 0942 εMC


cone core

SRC track


i






pT of 2 muon [GeV]




L ONL Ok σσ sdot=


[GeV])γ(Z10 10

210

3

k-fa

cto

r

1

12

14

16

18

2

+ 100 MeVΛNLO

= 209 MeVΛNLO

- 100 MeVΛNLO

NNLO CTEQ6

NNLO CTEQ5


πmicroαπ

2

)(

3

41

3

41 2 S

NLOk sdot

++=

LONLOk σσ sdot=



NNLO











Final Cuts










~

~



~~

01





~ ~1

Inv di-muon mass




Signal Efficiencies





mmicrolt265 GeV~















production decay







( )

1

02βtan

0A0

minus=

==

micromicro






DOslash Run I



~

~







rarr 666 events



εData = 0942 εMC


cone core

SRC track


i






pT of 2 muon [GeV]




L ONL Ok σσ sdot=


[GeV])γ(Z10 10

210

3

k-fa

cto

r

1

12

14

16

18

2

+ 100 MeVΛNLO

= 209 MeVΛNLO

- 100 MeVΛNLO

NNLO CTEQ6

NNLO CTEQ5


πmicroαπ

2

)(

3

41

3

41 2 S

NLOk sdot

++=

LONLOk σσ sdot=



NNLO











Final Cuts










~

~



~~

01





~ ~1

Inv di-muon mass




Signal Efficiencies





mmicrolt265 GeV~
















( )

1

02βtan

0A0

minus=

==

micromicro






DOslash Run I



~

~







rarr 666 events



εData = 0942 εMC


cone core

SRC track


i






pT of 2 muon [GeV]




L ONL Ok σσ sdot=


[GeV])γ(Z10 10

210

3

k-fa

cto

r

1

12

14

16

18

2

+ 100 MeVΛNLO

= 209 MeVΛNLO

- 100 MeVΛNLO

NNLO CTEQ6

NNLO CTEQ5


πmicroαπ

2

)(

3

41

3

41 2 S

NLOk sdot

++=

LONLOk σσ sdot=



NNLO











Final Cuts










~

~



~~

01





~ ~1

Inv di-muon mass




Signal Efficiencies





mmicrolt265 GeV~



















rarr 666 events



εData = 0942 εMC


cone core

SRC track


i






pT of 2 muon [GeV]




L ONL Ok σσ sdot=


[GeV])γ(Z10 10

210

3

k-fa

cto

r

1

12

14

16

18

2

+ 100 MeVΛNLO

= 209 MeVΛNLO

- 100 MeVΛNLO

NNLO CTEQ6

NNLO CTEQ5


πmicroαπ

2

)(

3

41

3

41 2 S

NLOk sdot

++=

LONLOk σσ sdot=



NNLO











Final Cuts










~

~



~~

01





~ ~1

Inv di-muon mass




Signal Efficiencies





mmicrolt265 GeV~















εData = 0942 εMC


cone core

SRC track


i






pT of 2 muon [GeV]




L ONL Ok σσ sdot=


[GeV])γ(Z10 10

210

3

k-fa

cto

r

1

12

14

16

18

2

+ 100 MeVΛNLO

= 209 MeVΛNLO

- 100 MeVΛNLO

NNLO CTEQ6

NNLO CTEQ5


πmicroαπ

2

)(

3

41

3

41 2 S

NLOk sdot

++=

LONLOk σσ sdot=



NNLO











Final Cuts










~

~



~~

01





~ ~1

Inv di-muon mass




Signal Efficiencies





mmicrolt265 GeV~


















pT of 2 muon [GeV]




L ONL Ok σσ sdot=


[GeV])γ(Z10 10

210

3

k-fa

cto

r

1

12

14

16

18

2

+ 100 MeVΛNLO

= 209 MeVΛNLO

- 100 MeVΛNLO

NNLO CTEQ6

NNLO CTEQ5


πmicroαπ

2

)(

3

41

3

41 2 S

NLOk sdot

++=

LONLOk σσ sdot=



NNLO











Final Cuts










~

~



~~

01





~ ~1

Inv di-muon mass




Signal Efficiencies





mmicrolt265 GeV~
















L ONL Ok σσ sdot=


[GeV])γ(Z10 10

210

3

k-fa

cto

r

1

12

14

16

18

2

+ 100 MeVΛNLO

= 209 MeVΛNLO

- 100 MeVΛNLO

NNLO CTEQ6

NNLO CTEQ5


πmicroαπ

2

)(

3

41

3

41 2 S

NLOk sdot

++=

LONLOk σσ sdot=



NNLO











Final Cuts










~

~



~~

01





~ ~1

Inv di-muon mass




Signal Efficiencies





mmicrolt265 GeV~






















Final Cuts










~

~



~~

01





~ ~1

Inv di-muon mass




Signal Efficiencies





mmicrolt265 GeV~


















~

~



~~

01





~ ~1

Inv di-muon mass




Signal Efficiencies





mmicrolt265 GeV~

















~ ~1

Inv di-muon mass




Signal Efficiencies





mmicrolt265 GeV~














Signal Efficiencies





mmicrolt265 GeV~















mmicrolt265 GeV~













Christian Autermann III. Physikalisches Institut A RWTH Aachen · July 2004, New Phenomena Meeting...

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Transcript of Christian Autermann III. Physikalisches Institut A RWTH Aachen · July 2004, New Phenomena Meeting...