A measurement of the mass difference between top and anti-top quarks is presented.In a 4.7fb−1 data sample of proton–proton collisions at √s=7TeV recorded with the ATLAS detector at the LHC, events consistent with t¯t production and decay into a single charged lepton final state are reconstructed. For each event,the mass difference between the top and anti-top quark candidate is calculated. A two b-tag requirement is used in order to reduce the background contribution. A maximum likelihood fit to these per-event mass differences yieldsm≡mt−m¯t=0.67±0.61(stat)±0.41(syst)GeV,consistent with CPT invariance.

Measurement of the mass difference between top and anti-top quarks in pp collisions at √s=7TeV using the ATLAS detector

CONTA, CLAUDIO;FRANCHINO, SILVIA;FRATERNALI, MARCO;LIVAN, MICHELE;NEGRI, ANDREA;REBUZZI, DANIELA MARCELLA;RIMOLDI, ADELE;
2014-01-01

Abstract

A measurement of the mass difference between top and anti-top quarks is presented.In a 4.7fb−1 data sample of proton–proton collisions at √s=7TeV recorded with the ATLAS detector at the LHC, events consistent with t¯t production and decay into a single charged lepton final state are reconstructed. For each event,the mass difference between the top and anti-top quark candidate is calculated. A two b-tag requirement is used in order to reduce the background contribution. A maximum likelihood fit to these per-event mass differences yieldsm≡mt−m¯t=0.67±0.61(stat)±0.41(syst)GeV,consistent with CPT invariance.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11571/785647
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