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, A., Alviggi, M., Canale, V., Chiefari, G., DELLA VOLPE, D., Merola, L., Conventi, F., DELLA PIETRA, M., Giordano, R., Rossi, E., SANCHEZ PINEDA, A.R., Carlino, G., de Asmundis, R., Di Donato, C., Doria, A., Iengo, P., Izzo, V., Sekhniaidze, G., Et, A.l.. - 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.
