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  • “School of Particles”

     
    Paper   IPM / Particles / 11563
       School of Particles and Accelerator
      Title: Search for Quark Compositeness with the Dijet Centrality Ratio in pp Collisions at sqrt(s)=7 TeV
      Author(s):
    1 . Hessamaddin Arfaei
    2 . Hamed Bakhshiansohi
    3 . Seyed Mohsen Etesami
    4 . Ali Fahim
    5 . Majid Hashemi
    6 . Abideh Jafari
    7 . Mohsen Khakzad
    8 . A Mohammadi
    9 . Mojtaba Mohammadi Najafabadi
    10 . Saeid Paktinat Mehdiabadi
    11 . Batool Safarzadeh
    12 . Maryam Zeinali
      Status: Published
      Journal: Phys. Rev. Lett.
      No.: 262001
      Vol.: 105
      Year: 2010
      Pages: 22
      Supported by: IPM
      Abstract:
    A search for quark compositeness in the form of quark contact interactions, based on hadronic jet pairs (dijets) produced in proton-proton collisions at sqrt(s)=7 TeV, is described. The data sample of the study corresponds to an integrated luminosity of 2.9 inverse picobarns collected with the CMS detector at the LHC. The dijet centrality ratio, which quantifies the angular distribution of the dijets, is measured as a function of the invariant mass of the dijet system and is found to agree with the predictions of the Standard Model. A statistical analysis of the data provides a lower limit on the energy scale of quark contact interactions. The sensitivity of the analysis is such that the expected limit is 2.9 TeV; because the observed value of the centrality ratio at high invariant mass is below the expectation, the observed limit is 4.0 TeV at the 95

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