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Measurement of the mass difference between top and antitop quarks


CDF Collaboration; et al; Canelli, F; Kilminster, B (2013). Measurement of the mass difference between top and antitop quarks. Physical Review D (Particles, Fields, Gravitation and Cosmology), 87(5):052013.

Abstract

We present a measurement of the mass difference between top (t) and antitop (t¯) quarks using tt¯ candidate events reconstructed in the final state with one lepton and multiple jets. We use the full data set of Tevatron 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 pair signal events and background events. The resulting mass difference distribution in data compared to signal and background templates using a likelihood fit yields ΔMtop=Mt−Mt¯=−1.95±1.11(stat)±0.59(syst)  GeV/c2 and is in agreement with the standard model prediction of no mass difference.

Abstract

We present a measurement of the mass difference between top (t) and antitop (t¯) quarks using tt¯ candidate events reconstructed in the final state with one lepton and multiple jets. We use the full data set of Tevatron 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 pair signal events and background events. The resulting mass difference distribution in data compared to signal and background templates using a likelihood fit yields ΔMtop=Mt−Mt¯=−1.95±1.11(stat)±0.59(syst)  GeV/c2 and is in agreement with the standard model prediction of no mass difference.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2013
Deposited On:20 Feb 2014 09:05
Last Modified:13 Dec 2017 06:46
Publisher:American Physical Society
ISSN:1550-2368
Publisher DOI:https://doi.org/10.1103/PhysRevD.87.052013

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