Measurement of the Mass Difference Between Top and Anti-top Quarks at CDF
Creators: name: Aaltonen, T.
name: Gonzalez, B. Alvarez
name: Amerio, S.
name: Amidei, D.
name: Anastassov, A.
name: Annovi, A.
name: Antos, J.
name: Apollinari, G.
name: Appel, J. A.
name: Apresyan, A.
name: Arisawa, T.
name: Artikov, A.
name: Asaadi, J.
name: Ashmanskas, W.
name: Auerbach, B.
name: Aurisano, A.
name: Azfar, F.
name: Badgett, W.
name: Barbaro-Galtieri, A.
name: Barnes, V. E.
name: Barnett, B. A.
name: Barria, P.
name: Bartos, P.
name: Bauce, M.
name: Bauer, G.
name: Bedeschi, F.
name: Beecher, D.
name: Behari, S.
name: Bellettini, G.
name: Bellinger, J.
name: Benjamin, D.
name: Beretvas, A.
name: Bhatti, A.
name: Binkley, M.
name: Bisello, D.
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name: Blumenfeld, B.
name: Bocci, A.
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name: Boveia, A.
name: Brigliadori, L.
name: Brisuda, A.
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name: Bucciantonio, M.
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name: Canelli, F.
name: Carls, B.
name: Carlsmith, D.
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name: Carrillo, S.
name: Carron, S.
name: Casal, B.
name: Casarsa, M.
name: Castro, A.
name: Catastini, P.
name: Cauz, D.
name: Cavaliere, V.
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name: Cerri, A.
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name: Chen, Y. C.
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name: Chlebana, F.
name: Cho, K.
name: Chokheli, D.
name: Chou, J. P.
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name: Ciocci, M. A.
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Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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 $ΔM_{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.
description: Accepted in Phys. Rev. D