Resonant Slepton Production

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1 Overvew III. Physkalsches Insttut A Resonant Slepton Producton Chrstan Autermann III. Phys. Inst. A, RWTH Aachen The Sgnal Processes Lmt Calculaton Model-Independent Lmts Combned Lmts Supported by Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5

2 R-party Volatng Supersymmetry III. Physkalsches Insttut A R - party : W W R/ P R P = W MSSM = ( ) + W R/ P 3B+ L+ S ' '' = λ L L E + λ L Q D + λ U jk j k jk j k jk S s the partcle spn, B s the baryon number, L s the lepton number D j D k R-party volatng extenson of the MSSM,j,k =,,3 generaton ndces R-party conservng producton assocated/par producton of gaugnos decay va λ jk nto 4 charged leptons requre 3 charged leptons for analyss + X : Danela Käfer (λ ) Resonant producton va λ of smuon or sneutrno Cascade decay to LSP (neutralno) decay va λ nto jets & lepton Chral superfelds: L: lepton doublet superfeld E: lepton snglet superfeld Q: quark doublet superfeld D: down-lke quark snglet superfeld λ, λ`, λ``: Yukawa couplngs Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5

3 A typcal sgnal process III. Physkalsches Insttut A Slepton producton va LQD couplng λ Slepton decays to a gaugno and an assocated muon Cascade decay of the gaugno nto neutralno Decay of the neutralno va LQD couplng λ nto another muon and two quarks u DØ Detector jet muon χ ~ λ d χ ~ d jet u λ ~ Z? (jets, leptons or mssng E T ) muon Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5

4 Sgnal Branchng Ratos III. Physkalsches Insttut A no muon one muon two muons ( golden channel ) Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5

5 Data Sample & Preselecton III. Physkalsches Insttut A Data from Aprl August 4 good recorded Lumnosty: ~347 pb - (prelmnary) Preselecton Sample Any D-muon trgger has fred Veto aganst cosmc muons (Scntllator tmngs) good muons wth pt > GeV, pt > 8 GeV central track match & solaton for both muons 6 events, expected background: ~ 984±67(stat)±54(syst) event Corrected for - Dmuon Trgger effcency - Muon reconstructon effcences - Isolaton effcences - Track fndng & matchng - Muon momentum smearng - Jet energy scale Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5

6 Sgnal Channels III. Physkalsches Insttut A After applyng the -muon -jet preselecton there are three remanng sgnal channels:.. 3. ~ ~ χ ~ χ ~ ~ ν χ ±,3,4 ~, Analyze each channel separately Gve lmt on σ BR for each channel, depends only on masses, not Model! Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5

7 Data Consstency: Preselecton () III. Physkalsches Insttut A number of events /. GeV Reconstructed Z-mass DO RunII prelmnary Data χ, #58 χ, #58 ν χ ±, #58 QCD from Data tt Z/γ -> Z/γ ->ττ Y Domnant SM MC s Z/γ QCD s estmated from Data by a) usng data events wth lke-sgn, nearly solated muons b) data events wth b-tag Best agreement wth method (b). Sgnal channels x ~ ~ χ ~ χ ~,3,4 ~ ~ χ ± ν, nv. d-muon mass [GeV] Other consdered but neglgble SM backgrounds: ttbar ll, ttbar l jet Z ττ Y(s), Y(s) W ν ZZ, WZ, WW Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5

8 Data Consstency: Preselecton () III. Physkalsches Insttut A Preselecton & jet p T > 5 GeV Transverse Momentum of jet Transverse Momentum of jet number of events / 3. GeV 9 DO RunII prelmnary Data data χ, #58 8 χ, #58 sgnal x ν χ ±, #58 QCD from Data Z/γ 6-3 GeV tt Z/γ -> Z/γ ->ττ Y Z/γ 5-6 GeV QCD, b-tag data tt ll number of events /.5 GeV data sgnal x Statstcs Data Sgnal, pont #56 SM ± syst. ± stat. sytematc uncertanty jet p T [GeV] ~ ~ χ ~ χ ~ ~ ν ~ χ ±,3,4, jet p T [GeV] (m χ =GeV, m =63GeV) Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5

9 Data Consstency: Preselecton (3) III. Physkalsches Insttut A number of events / 6. GeV Reconstructed χ Preselecton & jet p T > 5 GeV & jet p T > 5 GeV nd Mass wth data sgnal x DO RunII prelmnary Data χ, pont #58 χ, pont #58 ν χ ±, pont #58 QCD from Data tt Z/γ -> Z/γ 5-6 GeV Z/γ ->ττ Y Z/γ 6-3 GeV QCD tt ll number of events / 8. GeV Reconstructed χ Mass wth st Statstcs Data Sgnal, pont #56 SM ± syst. ± stat. data sgnal x sytematc uncertanty nv. mass of, jet, jet [GeV] ~ ~ χ ~ χ ~ ~ ν ~ χ ±,3,4, nv. mass of, jet, jet [GeV] Sgnal unscaled (m χ =GeV, m =63GeV) Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5

10 Constant Correctons () III. Physkalsches Insttut A MC eff. Data eff. correcton Muon Reconstructon.938±..93±..973±.7 Muon central track fndng & matchng.97±..988±..6±.6 Muon track solaton.956±..944±..989±. Medum Muon.956±..97±..6±.6 Method: Tag & Probe Data: -muon sample MC: Z-peak 6-3 GeV (Pytha) Data eff. / MC eff. s flat for p T, η, φ and nv. -mass Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5

11 p T Constant Correctons () φ III. Physkalsches Insttut A η reco correcton muon reconstructon.8.6 mean.973 ±.7 reco correcton.8.6 mean.973 ±.7 reco correcton.8.6 mean.973 ±.7 muon trackmatch muon solaton track correcton solaton correcton.4..8 murecoeff Data / Z/γ (6-3 GeV) p T [GeV] mean.9 ±.9 mean.989 ±. MU Data / Z/γ (6-3 GeV) p T [GeV].4 track correcton solaton correcton.4..8 murecoeff Data / Z/γ (6-3 GeV) φ mean.9 ±.9 mean.989 ±. MU Data / Z/γ (6-3 GeV) φ track correcton solaton correcton mean.7 ±.7 murecoeff Data / Z/γ (6-3 GeV) MU Data / Z/γ (6-3 GeV) η mean.989 ±. η... MU Data / Z/γ (6-3 GeV) MU Data / Z/γ (6-3 GeV) MU Data / Z/γ (6-3 GeV) p T [GeV] φ η Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5

12 D Cuts Fnal selecton III. Physkalsches Insttut A Fnal sgnal selecton on Preselecton & wth d-jets: slepton neutralno mass plane good separaton other D cuts n planes wth -d- mass - p T + p T - nv. d-jet mass - sum of jet p T - R(jet jet ) Each D cut s optmzed wth respect to sgnal effcency purty [GeV] nv. mass of, jet, jet Sgnal (m χ =GeV, m =63GeV) DO RunII prelmnary Data χ QCD from Data tt Z/γ -> Z/γ ->ττ Y, pont # nv. mass of,, jet, jet [GeV] Hgh sgnal purty can be acheved Strong dependence on msugra pont Optmze all cut parameters for each D cut and each msugra pont Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5

13 Prelmnary Results III. Physkalsches Insttut A for λ =.7 75 msugra ponts analyzed ~3M sgnal events Scans for tan β = 5, 5 and both sgn of Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5

14 Consstency of found data and SM expectaton III. Physkalsches Insttut A Analyzed ~75 SUSY ponts and 3 dfferent channels Fll devaton [Λ] nto hstogram d b Λ σ + b b # sgnal ponts 5 5 Combned channel ~ l X sgma =.7 mean =. The mean (~ ) s a sgn for the general agreement The wdth (~ ) characterzes the correctness of the estmated systematc errors. The measured data s fluctuatng wthn these errors devaton [σ] tanβ=5, sgn =- [Λ] Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5

15 Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5 III. Physkalsches Insttut A Lmt Calculaton wth TLmt!! ) ( ) ( d b d b s d b e d b s e X + + = = = n X X Lkelhood test statstc X: dscrmnates sgnal-lke outcomes from background multple channels: Probablty, assumng presence of sgnal and background: = = ) ( ) ' ( ' ) (! ' ) ( d X d X n d b s b s d b s e CL Cross secton Lmt: Scale sgnal expectaton (sgnal cross secton) so that ( CL s )= 95%. b b s s CL CL CL + = (TJunk, NIM A434, p , 999)

16 III. Physkalsches Insttut A Model-Independent Lmts on σ BR [pb] (all prelmnary) Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5

17 mass [GeV] ~ ~ χ ) [pb] χ ) BR( Lmt σ(qq III. Physkalsches Insttut A D RunII prelmnary Generated ponts χ mass [GeV] Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5

18 mass [GeV] ~ ~ χ,3, III. Physkalsches Insttut A ) [pb] χ,3,4 Lmt σ(qq ) BR( 5 4 D RunII prelmnary Generated ponts χ mass [GeV] Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5

19 ~ ~ χ III. Physkalsches Insttut A mass [GeV] χ mass [GeV] D RunII prelmnary Generated ponts χ mass [GeV] ) [pb] χ ) BR( Lmt σ(qq Combnaton of ~ ~ and ~ ~ χ under the constrant, that ( ~ ) ( ~ m χ m ) χ χ Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5

20 ν mass [GeV] ~ ν ~ χ ± III. Physkalsches Insttut A ) [pb] χ ± Lmt σ(qq ν ) BR(ν D RunII prelmnary Generated ponts χ mass [GeV] ± Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5

21 III. Physkalsches Insttut A Combned Lmts wth the assumpton of msugra Excluded areas for specfc couplngs λ (prelmnary) Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5

22 Excluson Contour for λ n msugra III. Physkalsches Insttut A [GeV] m / m m / plane ~ l= GeV D RunII prelmnary ~ l=3 GeV χ = GeV χ =75 GeV Generated ponts [GeV] m % CL Excluson Contour for λ mass [GeV] ~ l slepton-mass gaugno-mass plane ± χ, χ mass [GeV] Not allowed D RunII prelmnary Generated ponts χ mass [GeV] λ msugra A=, tan(β)=5, sgn()= Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5

23 -dm Projecton on const. slepton mass III. Physkalsches Insttut A slepton-mass = GeV slepton-mass = 3 GeV lmt,σ [pb] 8 6 D RunII prelmnary ~ σ tot, l=gev, tan(β)=5 Lmt 95% CL Expected Lmt lmt,σ [pb] λ =.9 D RunII prelmnary ~ σ tot, l=3gev, tan(β)=5 Lmt 95% CL Expected Lmt 4 8 λ =.8 λ =.7 λ =.6 Not allowed λ =.8 λ =.7 λ =.6 Not allowed 6 λ =.5.5 λ =.5 4 λ =.4 λ =.4 λ =.3.5 λ = Neutralno mass χ [GeV] Neutralno mass χ [GeV] msugra A=, tan(β)=5, sgn()= Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5

24 -dm Projecton on const. neutralno mass III. Physkalsches Insttut A neutralno mass = 75 GeV neutralno mass = GeV lmt,σ [pb] Not allowed λ =.7 λ =.6 λ =.5 λ =.4 D RunII prelmnary σ tot, χ =75GeV, tan(β)=5 Lmt 95% CL Expected Lmt lmt,σ [pb] Not allowed λ =.8 λ =.7 λ =.6 λ =.5 D RunII prelmnary σ tot, χ =GeV, tan(β)=5 Lmt 95% CL Expected Lmt 4 λ =.3 λ = ~ Slepton mass l [GeV] ~ Slepton mass l [GeV] msugra A=, tan(β)=5, sgn()= Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5

25 Conclusons III. Physkalsches Insttut A Search for RPV SUSY through the LQD couplng λ Well understood -muon Preselecton data sample Model-Independent Lmts for ~ ~ χ, ~ ~ χ and ~ ν ~ χ ±,3,4, Combned Lmts for resonant slepton producton ~ l X A problem wth the Generator needs further studes Analyss s n the process of gettng publshed Chrstan Autermann Graduertenkollegsemnar Bad Honnef, / 5

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