Measurement of the mass difference between top and antitop quarks

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Identificadores
URI: https://hdl.handle.net/10902/28865
ISSN: 1550-7998
ISSN: 1550-2368
ISSN: 2470-0010
ISSN: 2470-0029
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Autoría
Aaltonen, Timo Antero; Casal Laraña, Bruno; Cuevas Maestro, Francisco Javier; Gómez Gramuglio, GervasioAutoridad Unican; Palencia Cortezón, José Enrique; Ruiz Jimeno, AlbertoAutoridad Unican; Scodellaro, LucaAutoridad Unican; Vilar Cortabitarte, RocíoAutoridad Unican; Vizán García, Jesús ManuelAutoridad Unican
Fecha
2013
Derechos
© 2013 American Physical Society
Publicado en
Physical Review D, 2013, 87(5), 052013
Editorial
American Physical Society
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Resumen/Abstract
We present a measurement of the mass difference between top (t) and antitop (¯t) quarks using t¯t 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−M¯t=−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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