Transcript Slide 1
Data results for inclusive all-hadronic (RAp) with 318 nb-1 Data Plots Towards Jamboree SUSY Hadronic/GMSB Meeting 27-08-10 [email protected] [C. Rogan et al.] Introduction and full analysis path + full MC analysis shown by Chris yesterday http://indico.cern.ch/conferenceDisplay.py?confId=105112 AN- will appear very soon (possibly next week) Fully-Inclusive Hadronic SUSY Search [C.Rogan et. al.] New variables to be used together for discovery and characterization of SUSY Dimension-less - for S/B discrimination Suppresses backgrounds and shapes distributions in the variable in a predictable and wellunderstood way - the Razor Doesn’t involve MET Uses both transverse and longitudinal information Peaks for signal events falls exponentially for backgrounds N.B. Good Data/MC agreement w/ ALPGEN NOT w/ Pythia (see backup) http://indico.cern.ch/conferenceDisplay.py?confId=95896 http://indico.cern.ch/conferenceDisplay.py?confId=93857 http://indico.cern.ch/conferenceDisplay.py?confId=105112 http://arxiv.org/abs/1006.2727 SUSY LM1 Alpgen QCD CMS DATA Analysis using these variables sensitive to SUSY LM1 with ~10 pb-1 of data for PF jet, Calo jet and/or Track jet analysis (JPT in progress) MR Peaks for signal events - falls exponentially for backgrounds in all cases (see also back-up) PF Jets Track Jets Calo Jets Min-Bias data from June 16th ReReco Variables robust against detector mis-measurements/noise/spurious effects Exponential behavior invariant under cleaning procedure Data/MC comparisons in control regions towards background estimations (Loose R cuts + different control regions = overconstrained bkg yields in signal region) 4 BACK-UP SLIDES Selection/Sample Details For everything shown in this talk: 7 TeV MC (see back-up slide for list of samples) 7 TeV Data (up to run 140387 right now ~318 nb-1) OR of HT200 and Jet110 triggers (for the moment) PF MET used (tcMET or corrected caloMET fine too) Require di-jets satisfying (parallel analyses): Corrected Calo jets Loose jet ID Corrected PF jets Loose jet ID Uncorrected Track jets Only high quality tracks w/ vertex consistent with reco PV considered for clustering NO explicit lepton/photon reco or ID in constructing these variables If > 2 reco jets, form two hemispheres by minimizing invariant masses added in quadrature (see back-up slides) 6 PF jets The Razor in data (I) 7 MR and R in Data (II) Alpgen QCD MC CMS DATA Behavior of MR and R is confirmed with data both qualitatively and quantitatively 8 Loose R, PF Jet Analysis (318 nb-1) 9 Loose R, PF Jet Analysis (318 nb-1, ) 10 Tighter R, PF Jet Analysis (318 nb-1) 11 Tighter R, PF Jet Analysis (318 nb-1) 12 Towards Backgrounds Estimations QCD background control sample from data Using a loose R-cuts we have a QCD dominated sample which we can use to measure the QCD slope, as a function of R-cut, in the low MR region Can do this in any region with QCD population in low MR 13 SUPER-PRELIMINARY Discovery Potential 3 Observation 5 Discovery Here, we look at estimated sensitivity for a PF Jets based search, doing a counting experiment and estimating systematic uncertainty assuming ratios of events in control regions to signal region (conservative estimate) Sensitivity comparable for each jet type considered 14