Exclusion of an Exotic Top Quark with -4/3 Electric Charge Using Soft Lepton Tagging

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Aaltonen , T , Mehtälä , P , Orava , R , Saarikko , H , Österberg , K & CDF Collaboration 2010 , ' Exclusion of an Exotic Top Quark with -4/3 Electric Charge Using Soft Lepton Tagging ' Physical Review Letters , vol. 105 , no. 10 , pp. 101801 . DOI: 10.1103/PhysRevLett.105.101801

Title: Exclusion of an Exotic Top Quark with -4/3 Electric Charge Using Soft Lepton Tagging
Author: Aaltonen, Timo; Mehtälä, Petteri; Orava, Risto; Saarikko, Heimo; Österberg, Kenneth; CDF Collaboration
Contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Department of Physics
University of Helsinki, Doc­toral Pro­gramme in At­mo­spheric Sci­ences
University of Helsinki, Department of Physics
Date: 2010
Language: eng
Number of pages: 7
Belongs to series: Physical Review Letters
ISSN: 0031-9007
URI: http://hdl.handle.net/10138/24033
Abstract: We present a measurement of the electric charge of the top quark using $\ppbar$ collisions corresponding to an integrated luminosity of 2.7~fb$^{-1}$ at the CDF II detector. We reconstruct $\ttbar$ events in the lepton+jets final state and use kinematic information to determine which $b$-jet is associated with the leptonically- or hadronically-decaying $t$-quark. Soft lepton taggers are used to determine the $b$-jet flavor. Along with the charge of the $W$ boson decay lepton, this information permits the reconstruction of the top quark's electric charge. Out of 45 reconstructed events with $2.4\pm0.8$ expected background events, 29 are reconstructed as $\ttbar$ with the standard model $+$2/3 charge, whereas 16 are reconstructed as $\ttbar$ with an exotic $-4/3$ charge. This is consistent with the standard model and excludes the exotic scenario at 95\% confidence level. This is the strongest exclusion of the exotic charge scenario and the first to use soft leptons for this purpose.
Subject: 114 Physical sciences
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