SESAPS November 11, B. Scurlock, University of Florida1 Bobby Scurlock Darin Acosta Paolo Bartalini Richard Cavanaugh Alexey Drozdetskiy Guenakh Mitselmakher Yuriy Pakhotin Preparations for Inclusive Searches for Supersymmetry in the Leptons + Jets + MET Topology at CMS

SESAPS November 11, B. Scurlock, University of Florida2 Outline The Large Hadron Collider The Compact Muon Solenoid Triggers at CMS SuperSymmetry –Signatures –Fast CMS Simulation results –New Study using full CMS detector simulation Study systematic effects and ways to deal with them Establish new reach scenarios Develop tools for analysis with real data Conclusions The Large Hadron Collider The Compact Muon Solenoid Triggers at CMS SuperSymmetry –Signatures –Fast CMS Simulation results –New Study using full CMS detector simulation Study systematic effects and ways to deal with them Establish new reach scenarios Develop tools for analysis with real data Conclusions

SESAPS November 11, B. Scurlock, University of Florida3 The Large Hadron Collider R = 4.5 km E = 7 TeV CMS Two proton rings housed in same tunnel as LEP Design luminosity: L = cm –2 s –1 = 100 fb -1 /year (Pile up: ~20 collisions/crossing) Start-up luminosity: L ~ cm –2 s –1 = 10 fb -1 /year Completion: mid 2007 Two proton rings housed in same tunnel as LEP Design luminosity: L = cm –2 s –1 = 100 fb -1 /year (Pile up: ~20 collisions/crossing) Start-up luminosity: L ~ cm –2 s –1 = 10 fb -1 /year Completion: mid 2007

SESAPS November 11, B. Scurlock, University of Florida4 The Compact Muon Solenoid

SESAPS November 11, B. Scurlock, University of Florida5 SuperSymmetry Minimal Gravity Mediated Supersymmetry (mSUGRA): – –Universal gravitational interactions break SUSY at scale F ~ (10 11 GeV) 2 – –Reduces number of free parameters from 105 to 5 m 0 : Common scalar mass m 1/2 : Common gaugino mass A 0 : Common scalar trilinear coupling tan  : Ratio of v.e.v. of Higgs doublets Sign(  ) : sign of Higgsino mixing parameter Minimal Gravity Mediated Supersymmetry (mSUGRA): – –Universal gravitational interactions break SUSY at scale F ~ (10 11 GeV) 2 – –Reduces number of free parameters from 105 to 5 m 0 : Common scalar mass m 1/2 : Common gaugino mass A 0 : Common scalar trilinear coupling tan  : Ratio of v.e.v. of Higgs doublets Sign(  ) : sign of Higgsino mixing parameter

SESAPS November 11, B. Scurlock, University of Florida6 SUSY Event Rates and Cross-sections Sparticle Production ~ events/year Low mass SUSY ~ few Hz  Should be observable in early LHC running Sparticle Production ~ events/year Low mass SUSY ~ few Hz  Should be observable in early LHC running SUSY Production Rates at full design Luminosity 100 fb -1 /year

SESAPS November 11, B. Scurlock, University of Florida7 Jet and Lepton Triggers Low lumi High lumi Jet Trigger: If Single Jet Trigger Budget is ~few Hz implies an inclusive single jet threshold of 400– 600 GeV Inclusive Jet Rate (cone algorithm, R=0.5): Single Jet HLT Rate vs JetE T Cut Decreasing Rate Muon Trigger: If Muon Trigger Budget is ~ 30 Hz implies: 1  : PT > 20 GeV 2  : PT > 10 GeV NB: May be more advantageous to use Lepton Triggers because they are less systematically challenging than JetMET Triggers See K. Kotov’s Talk

SESAPS November 11, B. Scurlock, University of Florida8 SUSY Signature Squark/gluino production dominates the total cross-section for low energy SUSY Complex squark/gluino decay chains – –Many high-E T jets – –Heavy-flavor (  and b, especially at large tan  ) – –Leptons From sleptons, charginos, W/Z, and b-jets – –Missing transverse energy (MET) From LSP and neutrinos from taus, sneutrinos Squark/gluino production dominates the total cross-section for low energy SUSY Complex squark/gluino decay chains – –Many high-E T jets – –Heavy-flavor (  and b, especially at large tan  ) – –Leptons From sleptons, charginos, W/Z, and b-jets – –Missing transverse energy (MET) From LSP and neutrinos from taus, sneutrinos We are conducting a reach study for a few bench mark points in mSUGRA space using full detector simulation e.g. LM1 – –Includes systematic effects – – Other points in parameter space will be probed using fast simulation – – Results will be published in CMS Physics Technical Design Report next year We are conducting a reach study for a few bench mark points in mSUGRA space using full detector simulation e.g. LM1 – –Includes systematic effects – – Other points in parameter space will be probed using fast simulation – – Results will be published in CMS Physics Technical Design Report next year LM1 mSUGRA Parameters: – –m o = 60 GeV – –m 1/2 = 250 GeV – –tan  = 10 – –sign(  ) = +1 – –Ao = 0 – –  = 50 pb (NLO) LM1 mSUGRA Parameters: – –m o = 60 GeV – –m 1/2 = 250 GeV – –tan  = 10 – –sign(  ) = +1 – –Ao = 0 – –  = 50 pb (NLO) See Y. Pakhotin’s Talk

SESAPS November 11, B. Scurlock, University of Florida9 SUSY Study using Full Detector Simulation Previous study used fast CMS detector simulation CMSJET –No systematic uncertainties were included –Now including systematic effects on reach JetMET energy scale and resolution, Muon fake rates and ID, trigger efficiencies, etc Previous study used fast CMS detector simulation CMSJET –No systematic uncertainties were included –Now including systematic effects on reach JetMET energy scale and resolution, Muon fake rates and ID, trigger efficiencies, etc Example…systematic effects due to Calorimeter Calibration Uncertainty Raw MET from Full Simulation SM Background LM1 Signal Steeply falling BG Flatter Signal L=10 fb -1 Number of Background events passing a MET cut will be very sensitive to shifts in MET See M. Schmitt’s Talk S/√(S+B) S/√(S+B +  (Systematic i ) 2 ) METcut (GeV) Example

SESAPS November 11, B. Scurlock, University of Florida10 Jets+MET Reach vs. Luminosity (Fast Simulation) ~1 L=10 34 ~1 L=10 33 ~1 33 Tevatron reach < 0.5 TeV Squarks/gluinos probed to ~1.5 TeV with 1 fb -1 Up to 2.5 TeV at design luminosity (100 fb -1 ) Results using old fast simulation. No systematic effects included

SESAPS November 11, B. Scurlock, University of Florida11 Conclusions Discovery of SUSY, if it exists, is almost assured at the LHC –Inclusive mSUGRA squark/gluino discovery reach to 1.5 TeV with 1 fb –1, 2.5 TeV with 100 fb –1 Conducting a careful study of SUSY using full CMS detector simulation –Including potential systematic effects Discovery of SUSY, if it exists, is almost assured at the LHC –Inclusive mSUGRA squark/gluino discovery reach to 1.5 TeV with 1 fb –1, 2.5 TeV with 100 fb –1 Conducting a careful study of SUSY using full CMS detector simulation –Including potential systematic effects

SESAPS November 11, B. Scurlock, University of Florida12 Backup slides start here…

SESAPS November 11, B. Scurlock, University of Florida13 Example High Level Trigger Table Using Lepton Triggers for SUSY may be systematically less challenging than calorimeter based triggers  May be useful to use lepton triggers for early physics at CMS

SESAPS November 11, B. Scurlock, University of Florida14 SUSY – –Symmetry between bosons and fermions Squarks/sleptons: scalar counterparts to the fermions Charginos/neutralinos/gluinos: fermion counterparts to SM gauge bosons At least two Higgs doublets (5 scalars): – –Avoids fine-tuning of SM, can lead to GUTs Minimal Supersymmetric Standard Model (MSSM) – –Usually consider R P  (-1) 3(B-L)+2S conserved  LSP is stable – –105 new parameters Minimal Gravity Mediated Supersymmetry (mSUGRA): – –Require SUSY to be a local symmetry – –Universal gravitational interactions break SUSY at scale F ~ (10 11 GeV) 2 – –5 free parameters m 0 : Common scalar mass m 1/2 : Common gaugino mass A 0 : Common scalar trilinear coupling tan  : Ratio of v.e.v. of Higgs doublets Sign(  ) : sign of Higgsino mixing parameter – –Typically: SUSY – –Symmetry between bosons and fermions Squarks/sleptons: scalar counterparts to the fermions Charginos/neutralinos/gluinos: fermion counterparts to SM gauge bosons At least two Higgs doublets (5 scalars): – –Avoids fine-tuning of SM, can lead to GUTs Minimal Supersymmetric Standard Model (MSSM) – –Usually consider R P  (-1) 3(B-L)+2S conserved  LSP is stable – –105 new parameters Minimal Gravity Mediated Supersymmetry (mSUGRA): – –Require SUSY to be a local symmetry – –Universal gravitational interactions break SUSY at scale F ~ (10 11 GeV) 2 – –5 free parameters m 0 : Common scalar mass m 1/2 : Common gaugino mass A 0 : Common scalar trilinear coupling tan  : Ratio of v.e.v. of Higgs doublets Sign(  ) : sign of Higgsino mixing parameter – –Typically: Minimal SuperSymmetry

SESAPS November 11, B. Scurlock, University of Florida15 mSUGRA Cross-section LM1 mSUGRA Parameters: – –m o = 60 GeV – –m 1/2 = 250 GeV – –tan  = 10 – –sign(  ) = +1 – –Ao = 0 – –  = 50 pb (NLO) LM1 mSUGRA Parameters: – –m o = 60 GeV – –m 1/2 = 250 GeV – –tan  = 10 – –sign(  ) = +1 – –Ao = 0 – –  = 50 pb (NLO) Some Branching Ratios: dominate x-section Some Branching Ratios: dominate x-section – –Squark/gluino production dominates the total cross-section for low energy SUSY – –Cross sections don’t vary much with , tan 

SESAPS November 11, B. Scurlock, University of Florida16 SUSY Signatures Complex squark/gluino decay chains – –Many high-E T jets – –Heavy-flavor (  and b, especially at large tan  ) – –Leptons From sleptons, charginos, W/Z, and b-jets – –Missing transverse energy (MET) From LSP and neutrinos from taus, sneutrinos Complex squark/gluino decay chains – –Many high-E T jets – –Heavy-flavor (  and b, especially at large tan  ) – –Leptons From sleptons, charginos, W/Z, and b-jets – –Missing transverse energy (MET) From LSP and neutrinos from taus, sneutrinos One might expect: 3-4 Hard Jets Leading Jet E T  250 GeV MET  200 GeV One might expect: 3-4 Hard Jets Leading Jet E T  250 GeV MET  200 GeV LM1

SESAPS November 11, B. Scurlock, University of Florida17 Fast CMS Detector Simulation SUSY Study Counting excess events over SM background – –Discovery mode SUSY search at LHC – –Explicit sparticle reconstruction not done 6 Analyses: – –E T miss : jets+MET, no lepton requirements – –O l : no leptons – –1 l : 1 lepton – –2 l OS: 2 leptons, opposite sign – –2 l SS: 2 leptons, same sign – –3 l : 3 leptons Plot 5  sensitivity contours Counting excess events over SM background – –Discovery mode SUSY search at LHC – –Explicit sparticle reconstruction not done 6 Analyses: – –E T miss : jets+MET, no lepton requirements – –O l : no leptons – –1 l : 1 lepton – –2 l OS: 2 leptons, opposite sign – –2 l SS: 2 leptons, same sign – –3 l : 3 leptons Plot 5  sensitivity contours

SESAPS November 11, B. Scurlock, University of Florida18 Fast CMS Detector Simulation SUSY Study E T miss : jets+MET, no lepton requirements O l : no leptons 1 l : 1 lepton 2 l OS: 2 leptons, opposite sign 2 l SS: 2 leptons, same sign 3 l : 3 leptons E T miss : jets+MET, no lepton requirements O l : no leptons 1 l : 1 lepton 2 l OS: 2 leptons, opposite sign 2 l SS: 2 leptons, same sign 3 l : 3 leptons Highest mass scale achieved using jets+MET with no explicit lepton requirement Current study requires lepton trigger  Reach about 2 TeV Systematic effects expected to shift 5  contours lower Highest mass scale achieved using jets+MET with no explicit lepton requirement Current study requires lepton trigger  Reach about 2 TeV Systematic effects expected to shift 5  contours lower

SESAPS November 11, B. Scurlock, University of Florida19