Measurement of the Mass Difference between t and [overline t] Quarks
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PhysRevLett.106.152001.pdf
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Author(s)
CDF Collaboration
Bauer, Gerry P
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Makhoul, Khaldoun
Paus, Christoph M. E.
Date Issued
April 2011
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Aaltonen, T. et al. “Measurement of the Mass Difference betweentandt¯Quarks.” Physical Review Letters 106, 15 (April 2011): 152001 © 2011 American Physical Society
Version
Final published version
Abstract
We present a direct measurement of the mass difference between t and t̄ quarks using tt̄ candidate events in the lepton+jets channel, collected with the CDFII detector at Fermilab's 1.96 TeV Tevatron pp̄ 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 5.6fb ⁻¹, we measure a mass difference, ΔM top =M t -M t̄ =-3.3±1.4(stat) ±1.0(syst)GeV/c², approximately 2standard deviations away from the CPT hypothesis of zero mass difference.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.106.152001
