# Measurement of the mass difference between top and anti-top quarks in pp collisions at $\sqrt(s) = 7$ TeV using the ATLAS detector

Philip James Clark, Victoria Jane Martin, Corrinne Mills, Atlas Collaboration

Research output: Contribution to journalArticlepeer-review

## Abstract

A measurement of the mass difference between top and anti-top quarks is presented. In a 4.7 fb−1 data sample of proton–proton collisions at s=7 TeV recorded with the ATLAS detector at the LHC, events consistent with tt¯ 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 yields Δm≡mt−mt¯=0.67±0.61(stat)±0.41(syst) GeV , consistent with CPT invariance.
Original language English Aad:2013eva 363-379 Physics Letters B B728 https://doi.org/10.1016/j.physletb.2013.12.010 Published - 20 Jan 2014

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