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Title

Measurement of the Mass Difference between t and t̅ Quarks

AuthorsAaltonen, T.; Álvarez González, B.; Casal, Bruno ; Cuevas, Javier ; Gómez, G. ; Palencia, Enrique ; Rodrigo, Teresa ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Vila, Iván ; Vilar, Rocío
Issue DateApr-2011
PublisherAmerican Physical Society
CitationPhysical Review Letters 106(15): 152001 (2011)
AbstractWe present a direct measurement of the mass difference between t and t̅ quarks using tt̅ candidate events in the lepton+jets channel, collected with the CDF II detector at Fermilab’s 1.96 TeV Tevatron pp̅ 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 5.6  fb-1, we measure a mass difference, ΔMtop=Mt-Mt̅ =-3.3±1.4(stat)±1.0(syst)  GeV/c2, approximately 2 standard deviations away from the CPT hypothesis of zero mass difference.
Description7 páginas, 1 figura, 2 tablas.-- PACS numbers: 14.65.Ha, 12.15.Ff, 13.85.Ni, 13.85.Qk.-- CDF Collaboration: et al.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.106.152001
URIhttp://hdl.handle.net/10261/46270
DOI10.1103/PhysRevLett.106.152001
ISSN0031-9007
E-ISSN1079-7114
Appears in Collections:(IFCA) Artículos
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