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Scientific article
Open access
English

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

ContributorsATLAS Collaboration
Published inEuropean physical journal. C, Particles and fields, vol. 74, no. 6, 2883
Collection
  • Open Access - SCOAP3
Publication date2014
Abstract

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 s=8TeV 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 ( t~2 ) followed by the decay to the lighter top squark state ( t~1 ) via t~2→Zt~1 , and for t~1 pair production in natural gauge-mediated supersymmetry breaking scenarios where the neutralino ( χ~10 ) is the next-to-lightest supersymmetric particle and decays producing a Z boson and a gravitino ( G~ ) via the χ~10→ZG~ process.

Citation (ISO format)
ATLAS Collaboration. Search for direct top squark pair production in events with a Z boson, b -jets and missing transverse momentum in √s=8 TeV pp collisions with the ATLAS detector. In: European physical journal. C, Particles and fields, 2014, vol. 74, n° 6, p. 2883. doi: 10.1140/epjc/s10052-014-2883-6
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Article (Published version)
Identifiers
ISSN of the journal1434-6044
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