Measurement of the mass difference between $t$ and $\bar{t}$ quarks
Abstract
We present a direct measurement of the mass difference between and quarks using 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 and its partner to date.
Keywords
Cite
@article{arxiv.1103.2782,
title = {Measurement of the mass difference between $t$ and $\bar{t}$ quarks},
author = {CDF Collaboration and T. Aaltonen},
journal= {arXiv preprint arXiv:1103.2782},
year = {2011}
}
Comments
submitted to Phys. Rev. Lett