The results of a search for direct pair production of the scalar partner to the top quark using an integrated luminosity of 20.1 fb−1 of proton-proton collision data at. √s = 8 TeV recorded with the ATLAS detector at the LHC are reported. The top squark is assumed to decay via t → tX0<inf>i</inf> or t → bX±<inf>1</inf> → bW(*)X0<inf>1</inf>, where X0<inf>1</inf> (X±<inf>1</inf>) denotes the lightest neutralino (chargino) in supersymmetric models. The search targets a fully- hadronic final state in events with four or more jets and large missing transverse momentum. No significant excess over the Standard Model background prediction is observed, and exclusion limits are reported in terms of the top squark and neutralino masses and as a function of the branching fraction of t → tX0<inf>1</inf>. For a branching fraction of 100\%, top squark masses in the range 270–645 GeV are excluded for X0<inf>1</inf> masses below 30GeV. For a branching fraction of 50\% to either t → tX0<inf>1</inf> or t → bX±<inf>1</inf>, and assuming the X±<inf>1</inf> mass to be twice the X0<inf>1</inf> mass, top squark masses in the range 250–550 GeV are excluded for X0<inf>1</inf> masses below 60 GeV © 2014, CERN, for the benefit of the ATLAS Collaboration.

Search for direct pair production of the top squark in all-hadronic final states in proton-proton collisions at √s = 8 TeV 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; Giordano, Raffaele. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1126-6708. - 2014:9(2014), pp. 1-50. [10.1007/JHEP09(2014)015]

Search for direct pair production of the top squark in all-hadronic final states in proton-proton collisions at √s = 8 TeV with the ATLAS detector

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

Abstract

The results of a search for direct pair production of the scalar partner to the top quark using an integrated luminosity of 20.1 fb−1 of proton-proton collision data at. √s = 8 TeV recorded with the ATLAS detector at the LHC are reported. The top squark is assumed to decay via t → tX0i or t → bX±1 → bW(*)X01, where X01 (X±1) denotes the lightest neutralino (chargino) in supersymmetric models. The search targets a fully- hadronic final state in events with four or more jets and large missing transverse momentum. No significant excess over the Standard Model background prediction is observed, and exclusion limits are reported in terms of the top squark and neutralino masses and as a function of the branching fraction of t → tX01. For a branching fraction of 100\%, top squark masses in the range 270–645 GeV are excluded for X01 masses below 30GeV. For a branching fraction of 50\% to either t → tX01 or t → bX±1, and assuming the X±1 mass to be twice the X01 mass, top squark masses in the range 250–550 GeV are excluded for X01 masses below 60 GeV © 2014, CERN, for the benefit of the ATLAS Collaboration.
2014
Search for direct pair production of the top squark in all-hadronic final states in proton-proton collisions at √s = 8 TeV 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; Giordano, Raffaele. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1126-6708. - 2014:9(2014), pp. 1-50. [10.1007/JHEP09(2014)015]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/616463
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