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

Journal article

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.

Authors: Aaltonen, T; Gonzalez, B; Amerio, S; Amidei, D; Anastassov, A

• Publication status: Published
• Journal: Phys. Rev. D
• Volume: 87
• Issue: 6
• Pages: 052013
• Publication date: 2012-10-23
• DOI: 10.1103/PhysRevD.87.052013
• EISSN: 1029-8479
• ISSN: 1029-8479
• Keywords: hep-ex