Search for direct top squark pair production in events with a Z boson, b-jets and missing transverse momentum in sqrt(s)=8 TeV pp collisions with the ATLAS detector

  • Brian Cox (Contributor)
  • Cinzia Da Via (Contributor)
  • Alessandra Forti (Contributor)
  • Frederick Loebinger (Contributor)
  • Jiri Masik (Contributor)
  • Alexander Oh (Contributor)
  • Joleen Pater (Contributor)
  • Yvonne Peters (Contributor)
  • Andrew Pilkington (Contributor)
  • Darren Price (Contributor)
  • Yang Qin (Contributor)
  • Savanna Shaw (Contributor)
  • Stephen Watts (Contributor)
  • Terence Wyatt (Contributor)
  • The ATLAS Collaboration (Contributor)

    Dataset

    Description

    CERN-LHC. A search is presented for direct top squark pair production using events with at least two leptons including a same-flavour opposite-sign pair with invariant mass consistent with the Z boson mass, jets tagged as originating from b-quarks and missing transverse momentum. The analysis is performed with proton-proton collision data at sqrt(s) = 8 TeV collected with the ATLAS detector at the LHC in 2012 corresponding to an integrated luminosity of 20.3 fb^-1. No excess beyond the Standard Model expectation is observed. Interpretations of the results are provided in models based on the direct pair production of the heavier top squark state (t2) followed by the decay to the lighter top squark state (t1) via t2 --> Z t1, and for t1 pair production in natural gauge-mediated supersymmetry breaking scenarios where the neutralino (chi1^0) is the next-to-lightest supersymmetric particle and decays producing a Z boson and a gravitino (G) via the chi1^0 --> Z G process.
    Date made available4 Jan 2014
    PublisherHEPData

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