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 / Aad, G; Aloisio, Alberto; Alviggi, Mariagrazia; Canale, Vincenzo; Chiefari, Giovanni; DELLA VOLPE, Domenico; Merola, Leonardo; Conventi, Francesco; DELLA PIETRA, Massimo; Giordano, Raffaele; Rossi, Elvira; SANCHEZ PINEDA, ARTURO RODOLFO; Carlino, Gianpaolo; de Asmundis, Riccardo; Di Donato, Camilla; Doria, Alessandra; Iengo, Paolo; Izzo, Vincenzo; Sekhniaidze, Givi; Et, Al. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 74:2883(2014), pp. 1-25. [10.1140/epjc/s10052-014-2883-6]
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
