Measurement of the Mass Difference Between Top and Anti-top Quarks at CDF

Abstract

We present a measurement of the mass difference between top ($t$) and anti-top ($\bar{t}$) quarks using $t\bar{t}$ candidate events reconstructed in the final state with one lepton and multiple jets. We use the full data set of Tevatron $\sqrt{s}=1.96$ TeV proton-antiproton collisions recorded by the CDF II detector, corresponding to an integrated luminosity of 8.7 fb${}^{-1}$. We estimate event-by-event the mass difference to construct templates for top-quark signal events and background events. The resulting mass difference distribution of data compared to signal and background templates using a likelihood fit yields $\Delta M_{top}=M_t-M_{\bar{t}}=-1.95$pm$1.11(stat)$pm$0.59(syst)$ and is in agreement with the standard model prediction of no mass difference.

Accepted in Phys. Rev. D

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Cited by in corpus (5)

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• The Top Quark
• Measurement of the mass difference between top quark and antiquark in pp collisions at sqrt(s) = 8 TeV
• Combination of D0 measurements of the top quark mass