Measurement of the mass difference between top and antitop quarks

Details Measurement of the mass difference between top and antitop quarks Measurement of the mass difference between top and antitop quarks

2012-04-12

arxiv.org/abs/1204.2807v1

Physics

High Energy Physics

High Energy Physics - Experiment

Submitted to the Journal of High Energy Physics

Scientific paper

A measurement of the mass difference between the top and the antitop quark (Delta m(t) = m(t) - m(anti-t)) is performed using events with a muon or an electron and at least four jets in the final state. The analysis is based on data collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 4.96 +/- 0.11 inverse femtobarns, and yields the value of Delta m(t) = -0.44 +/- 0.46 (stat) +/- 0.27 (syst) GeV. This result is consistent with equality of particle and antiparticle masses required by CPT invariance, and provides a significantly improved precision relative to existing measurements.

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