Changes between Version 18 and Version 19 of Korea2017-01-CMS-EXO16-022


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Timestamp:
Aug 24, 2017, 10:38:22 AM (8 years ago)
Author:
Jung Chang
Comment:

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  • Korea2017-01-CMS-EXO16-022

    v18 v19  
    1010Long lived particles
    1111
     12A search for new long-lived particles decaying to electrons and muons is presented using data from proton-proton collisions produced in 2015 by the LHC. Events are selected with an electron and muon that both have transverse impact parameter values between 200 μm and 10 cm. Since no significant excess is observed, limits are set on the Displaced Supersymmetry model, with pair production of top squarks decaying into an e-μ final state via R-parity-violating interactions. The results are the most restrictive to date on this model.
     13
    1214== 2. Analysis global information ==
    1315
    1416*  CMS contact person:
    15 *  Center of mass energy:
    16 *  Integrated luminosity:
     17*  Center of mass energy: 13 TeV
     18*  Integrated luminosity: 2.6  fb^-1
    1719*  Link to arXiv: none
    1820*  Link to the collaboration page: http://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/EXO-16-022/
    … …  
    2830
    2931=== 3.1 Trigger selection ===
     32The events in the search sample are collected by a dedicated targets displaced e-mu pairs.
     33
     34Muons :  with momentum perpendicular to the beam axis,  pT> 38 GeV
     35Electrons : electromagnetic calorimeter with pT > 38 Gev
     36
     37To increase the acceptance,
     38
     39Muons : no cuts on the impact parameter or matching to a primary vertex are required for the muon leg of the trigger
     40Electrons : no tracking information is used in the electron leg of the trigger.
     41
    3042
    3143PS: This part cannot usually be described by the fast-simulation of detector.
    3244
    3345=== 3.2 Object definition ===
     46
     47* Electrons
     48   * |eta| < 2.4
     49   * pT > 42 GeV
     50   * separated by ΔR > 0.5
     51
     52* Muons
     53   * |eta| <2.4
     54   * pT > 40 GeV
     55   * separated by ΔR > 0.5
     56
     57* Jets
     58   * |eta| < 2.4
     59   * pT > 30 GeV
     60   * medium CSV b-tag (at least one of the two)
    3461
    3562Explained here how the objects are defined.
    … …  
    6794== 6. Questions / issues ==
    6895
     96== 7. Contact information ==
     97* J. Chang [mail: lovejesus99wwjd@gmail.com]
     98* D.Kang   [mail: dayou17@gmail.com]
     99* P.Wu     [mail: peiwen.wu123@gmail.co]
     100* S.Yang   [mail: slowmoyang@gmail.com]