Measurement of the mass difference between top and antitop quarks

Journal Article · Fri Jun 01 00:00:00 EDT 2012 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP06(2012)109· OSTI ID:1155788

Chatrchyan, Serguei ^[1]

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1. Yerevan Physics Inst. (Armenia)

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.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Contributing Organization: CMS Collaboration
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1155788
• Report Number(s): FERMILAB-PUB-12-701-CMS; CMS-TOP-11-019; CERN-PH-EP-2012-104; arXiv eprint number arXiv:1204.2807
• Journal Information: Journal of High Energy Physics (Online), Vol. 2012, Issue 6; ISSN 1029-8479
• Publisher: Springer Berlin
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS