Measurement of the mass difference between $t$ and $\bar{t}$ quarks

Details Measurement of the mass difference between $t$ and $\bar{t}$ quarks Measurement of the mass difference between $t$ and $\bar{t}$ quarks

2011-03-14

arxiv.org/abs/1103.2782v2

Phys.Rev.Lett.106:152001,2011

Physics

High Energy Physics

High Energy Physics - Experiment

submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.106.152001

We present a direct measurement of the mass difference between $t$ and $\bar{t}$ quarks using $\ttbar$ candidate events in the lepton+jets channel, collected with the CDF II detector at Fermilab's 1.96 TeV Tevatron \ppbar 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 \invfb{5.6}, we measure a mass difference, $\dmt = \mathrm{M}_{t} - \mathrm{M}_{\bar{t}} = -3.3 \pm 1.4(stat) \pm 1.0(syst)}$, approximately two standard deviations away from the CPT hypothesis of zero mass difference. This is the most precise measurement of a mass difference between $t$ and its $\bar{t}$ partner to date.

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