Measurement of the Mass Difference between t and t[over-bar] Quarks
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Aaltonen-2011-Measurement of the M.pdf
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Author(s)
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Paus, Christoph M. E.
Bauer, Gerry P
Makhoul, Khaldoun
Alternative Title
Measurement of the Mass Difference between t and t̅ Quarks
Date Issued
April 2011
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
T. Aaltonen et al. (CDF Collaboration). "Measurement of the Mass Difference between t and t[over-bar] Quarks." Phys. Rev. Lett. 106, 152001 (2011) [7 pages] © 2011 American Physical Society.
Version
Final published version
Abstract
We present a direct measurement of the mass difference between t and t[over-bar] quarks using tt[over-bar] candidate events in the lepton+jets channel, collected with the CDF II detector at Fermilab’s 1.96 TeV Tevatron pp[over-bar] Collider. We make an event by event estimate of the mass difference to construct templates for top quark pair signal events and background events. The resulting mass difference distribution of data is compared to templates of signals and background using a maximum likelihood fit. From a sample corresponding to an integrated luminosity of 5.6 fb[superscript -1], we measure a mass difference, DeltaMtop=Mt-Mt[over-bar] =-3.3±1.4(stat)±1.0(syst) GeV/c[superscript 2], approximately 2 standard deviations away from the CPT hypothesis of zero mass difference.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.106.152001
