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��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 (����1 0) is the next-to-lightest supersymmetric particle and decays producing a Z boson and a gravitino (G��) via the ����1 0 ��� ZG�� process. �� 2014 CERN for the benefit of the 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

ALOISIO, ALBERTO;ALVIGGI, MARIAGRAZIA;CANALE, VINCENZO;CHIEFARI, GIOVANNI;DELLA VOLPE, DOMENICO;MEROLA, LEONARDO;DELLA PIETRA, MASSIMO;GIORDANO, RAFFAELE;Rossi, Elvira;SANCHEZ PINEDA, ARTURO RODOLFO;
2014

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 = 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��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 (����1 0) is the next-to-lightest supersymmetric particle and decays producing a Z boson and a gravitino (G��) via the ����1 0 ��� ZG�� process. �� 2014 CERN for the benefit of the ATLAS collaboration.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/587460
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