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Measurement of the mass difference between top quark and antiquark in pp collisions at $\sqrt{s} = 8$ TeV


Abstract

The invariance of the standard model (SM) under the CPT transformation predicts equality of particle and antiparticle masses. This prediction is tested by measuring the mass difference between the top quark and antiquark ($Δm_t=m_t−m_\overline t$) that are produced in pp collisions at a center-of-mass energy of 8 TeV, using events with a muon or an electron and at least four jets in the final state. The analysis is based on data corresponding to an integrated luminosity of 19.6 $fb^{−1}$collected by the CMS experiment at the LHC, and yields a value of $Δm_t=−0.15±0.19(stat)±0.09(syst)$ GeV, which is consistent with the SM expectation. This result is significantly more precise than previously reported measurements.

Abstract

The invariance of the standard model (SM) under the CPT transformation predicts equality of particle and antiparticle masses. This prediction is tested by measuring the mass difference between the top quark and antiquark ($Δm_t=m_t−m_\overline t$) that are produced in pp collisions at a center-of-mass energy of 8 TeV, using events with a muon or an electron and at least four jets in the final state. The analysis is based on data corresponding to an integrated luminosity of 19.6 $fb^{−1}$collected by the CMS experiment at the LHC, and yields a value of $Δm_t=−0.15±0.19(stat)±0.09(syst)$ GeV, which is consistent with the SM expectation. This result is significantly more precise than previously reported measurements.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Uncontrolled Keywords:Nuclear and High Energy Physics
Language:English
Date:2017
Deposited On:11 Dec 2017 13:53
Last Modified:19 Aug 2018 10:40
Publisher:Elsevier
ISSN:0370-2693
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1016/j.physletb.2017.04.028

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