Measurement of the mass difference between top and antitop quarks

Authors

The CMS Collaboration
S. Chatrchyan, Yerevan Physics Institute
V. Khachatryan, Yerevan Physics Institute
Marc M. Baarmand, Florida Institute of Technology
B. Dorney, Florida Institute of Technology
Marcus Hohlmann, Florida Institute of Technology
Himali Kalakhety, Florida Institute of Technology
Igor Vodopiyanov, Florida Institute of Technology

Document Type

Article

Publication Title

Journal of High Energy Physics

Abstract

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.

DOI

doi.org/10.1007/JHEP06(2012)109

Publication Date

2012

Recommended Citation

The CMS collaboration., Chatrchyan, S., Khachatryan, V. et al. Measurement of the mass difference between top and antitop quarks. J. High Energ. Phys. 2012, 109 (2012). https://doi.org/10.1007/JHEP06(2012)109