1. SUSY Discovery at 10 TeV? UCL Atlas Meeting 2 nd May 2008

2. Introduction  10 TeV run coming soon (3-4 months long? Could get 100 pb -1 ?)  Our low-jet-multiplicity SUSY studies have potential for early data - so what about at 10TeV… could we hope to see something?  Currently no Monte Carlo…… BUT can reweight existing 14TeV MC For particular configuration with s,t,u should just need to change the probablity that incoming partons had that configuration i.e. just a PDF reweight x i : x of parton i at 14TeV x i ’: x of parton i at 10TeV

3. Check of Method Example Check: SU3 SUSY events generated in ATLFAST  pretty good agreement!  weights all < 1 Red is the reweighted sample

4. Event Selection CSC5 2-/3-Jet+0lepton+MET SUSY analyses: Cut No. 2-Jet3-Jet 0J70-XE70 triggerJ70_XE70 trigger 1p T Jet,1 > 150 GeV 2p T Jet,2 > 100 GeVp T Jet,3 > 100 GeV 3MET>max(100,0.3*M eff )MET>max(100,0.25*M eff ) 4 |phi(Jet1,2)-phi(MET)| > 0.2|phi(Jet1,2,3)-phi(MET)| > 0.2 5no isolated lepton For simplicity, just use our CSC5-style 2- and 3-Jet analyses – full details in note Effective Mass: M eff = ∑ p T Jet,i + MET (sum runs over 2(3) highest-pT jets)

5. Results: 2-Jet+0-lepton+MET CSC5 analysis: 14 TeV, 100pb -1  s = 14 TeV

6. REWEIGHTED to: 10 TeV  SUSY signal (SU3) reduced by factor of ~ 2.9  SM background reduced by factor of ~ 2.3  s = 14 TeV  s = 10 TeV Results: 2-Jet+0-lepton+MET CSC5 analysis: 14 TeV, 100pb -1 Compared to 14 TeV

7. REWEIGHTED to: 10 TeV  a few other mSUGRA points  s = 14 TeV  s = 10 TeV Results: 2-Jet+0-lepton+MET CSC5 analysis: 14 TeV, 100pb -1 14TeV10TeV SU12312 SU2< 1 SU33922 SU410667 SU6168 SU82412

8. BackUps

9. REWEIGHTED to: 10 TeVCSC5 analysis: 14 TeV, 100pb -1 Results: 3-Jet+0-lepton+MET  s = 14 TeV  s = 10 TeV

10. REWEIGHTED to: 10 TeVCSC5 analysis: 14 TeV, 100pb -1 Results: 3-Jet+0-lepton+MET  s = 14 TeV  s = 10 TeV 14TeV10TeV SU111 SU2< 1 SU3 SU4 SU6 SU8