-- MatthiasHamer - 2015-03-16

Long Lived Gluino Analysis

A summary of our studies so far

Summary of the Model

* hard process: producing a gluino pair and additional jets

* gluino has significant livetime and forms an R-Hadron

* the R-Hadron decays into 3 or 4 partons and a neutralino

* 1 or 2 of the partons are extremely soft ( typically pT < 2 GeV )

* the remainig 2 partons can have a significant transverse momentum, depending on the mass splitting between the Gluino and the Neutralino

* aiming for the production of a simplified model grid

  • pure Bino LSP
  • squark masses set to 40 TeV
  • all other superpartners, except for gluino and neutralino1, decoupled
  • 2 Parameters: gluino mass and mass difference between gluino and LSP
    • currently aiming for mGluino = 250, 500, 750, 1000 GeV, DeltaM = 40, 60, 80, 100 GeV

Analysis Idea

* use the ISR jet and/or the MET from the neutralinos to trigger on the events

  • so far we have identified HLT_PFJet260_v1 and HLT_PFMET170_NoiseCleaned_v1 as potentially interesting triggers
  • we hope to be able to use mulitjet-triggers and/or secondary vertex Triggers

* use reconstructed vertices and MET to separate signal from background processes

  • QCD (?)
  • top/single top production (?)
  • W/Z + jets (?)

Private MC

* so far we have used private MC for preliminary feasibility study

* used MadGraph5 2.1.2 for the hard process

  • so far, we have only generated pp -> go go jet / where jet is g u ~u d ~d c ~c s ~s b ~b

* using fragent MadGraph_matching_13TeV_cfi_py_GEN_SIM_cfg.py for running Pythia8 on the output

* have matching efficiency of roughly 10%

* using CMSSW_7_2_2_patch1 for the reconstruction

* see attached files for configuration files and MadGraph input cards

* started at new production for mGluino = 1000 GeV, DeltaM = 60 GeV

Topic attachments
I AttachmentSorted ascending History Action Size Date Who Comment
Texttxt addNonCHSJets_v2.py.txt r2 r1 manage 2.3 K 2015-04-02 - 18:23 MatthiasHamer  
Texttxt addNonCHSJets.py.txt r1 manage 1.4 K 2015-03-17 - 15:34 MatthiasHamer  
Texttxt crab_config_addNonCHSJets.py.txt r1 manage 0.7 K 2015-03-18 - 16:59 MatthiasHamer  
Unknown file formatlhe lhe_file_1000_60_large.lhe r1 manage 79737.9 K 2015-03-17 - 15:59 MatthiasHamer  
Texttxt MadGraph_matching_13TeV_cfi_py_GEN_SIM_1000_60_large.py.txt r2 r1 manage 5.3 K 2015-03-17 - 15:54 MatthiasHamer  
Texttxt miniAOD-prod_PAT.py.txt r1 manage 3.3 K 2015-03-17 - 15:34 MatthiasHamer  
Texttxt newMiniAOD.py.txt r1 manage 4.7 K 2015-04-02 - 18:23 MatthiasHamer  
Unknown file formatdat param_card.dat r1 manage 28.1 K 2015-03-17 - 14:55 MatthiasHamer  
Unknown file formatdat proc_card_mg5.dat r1 manage 1.8 K 2015-03-17 - 14:55 MatthiasHamer  
Unknown file formatdat run_card.dat r1 manage 15.9 K 2015-03-17 - 14:55 MatthiasHamer  
Texttxt step1_DIGI_L1_DIGI2RAW_HLT.py.txt r1 manage 3.8 K 2015-03-17 - 15:34 MatthiasHamer  
Texttxt step2_RAW2DIGI_L1Reco_RECO_EI_DQM.py.txt r1 manage 3.9 K 2015-03-17 - 15:34 MatthiasHamer  
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Topic revision: r7 - 2015-04-02 - MatthiasHamer
 
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