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
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 wit...
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| Formato: | JOUR |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_14346044_v74_n6_p_Aad |
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| Sumario: | 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 = 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 (t<inf>2</inf>) followed by the decay to the lighter top squark state (t<inf>1</inf>) via t<inf>2</inf> → Zt<inf>1</inf>, and for t<inf>1</inf> pair production in natural gaugemediated supersymmetry breaking scenarios where the neutralino (χ <inf>01</inf>) is the next-to-lightest supersymmetric particle and decays producing a Z boson and a gravitino (G ) via the χ <inf>01</inf> → Z G process. © 2014, CERN for the benefit of the ATLAS collaboration 2014. |
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