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  • “School of Particles”

     
    Paper   IPM / Particles / 12382
       School of Particles and Accelerator
      Title: Search for microscopic black holes in pp collisions at sqrt(s) = 7 TeV
      Author(s):
    1 . Hessamadin Arfaei
    2 . Hamed Bakhshiansohi
    3 . Seyed Mohsen Etesami
    4 . Ali Fahim
    5 . Majid Hashemi
    6 . Hoda Hesari
    7 . Abideh Jafari
    8 . Mohsen Khakzad
    9 . A Mohammadi
    10 . Mojtaba Mohammadi Najafabadi
    11 . Saeid Paktinat
    12 . Batool Safarzadeh
    13 . Maryam Zeinali
      Status: Published
      Journal: JHEP
      No.: 061
      Vol.: 1204
      Year: 2012
      Supported by: IPM
      Abstract:
    A search for microscopic black holes in pp collisions at a center-of-mass energy of 7 TeV is presented. The data sample corresponds to an integrated luminosity of 4.7 inverse femtobarns recorded by the CMS experiment at the LHC in 2011. Events with large total transverse energy have been analyzed for the presence of multiple energetic jets, leptons, and photons, which are typical signals of evaporating semiclassical and quantum black holes, and string balls. Agreement with the expected standard model backgrounds, which are dominated by QCD multijet production, has been observed for various combined multiplicities of jets and other reconstructed objects in the final state. Model-independent limits are set on new physics processes producing high-multiplicity, energetic final states. In addition, new model-specific indicative limits are set excluding semiclassical and quantum black holes with masses below 3.8 to 5.3 TeV and string balls with masses below 4.6 to 4.8 TeV. The analysis has a substantially increased sensitivity compared to previous searches

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