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

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URI: http://hdl.handle.net/10902/1861
ISSN: 0031-9007
ISSN: 1079-7114
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Author
Aaltonen, Timo Antero; Adelman, Jahred; Álvarez González, Bárbara; Amerio, Silvia; Amidei, Dante; Anastassov, Anton; Annovi, Alberto; Antos, Jaroslav; Apollinari, Giorgio; Appel, Jeffrey A.; Apresyan, Artur; Casal Laraña, Bruno; Cuevas Maestro, Francisco Javier; Gómez Gramuglio, Gervasio; Rodrigo Anoro, Teresa; Ruiz Jimeno, Alberto; Scodellaro, Luca; Vila Álvarez, Iván; Vilar Cortabitarte, Rocío; [et al.]
Date
2010-08-31
Derechos
© 2010 The American Physical Society
Publicado en
Physical Review Letters, vol 105, iss. 10, art. num. 101801 (2010)
Publisher
American Physical Society
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Abstract:
We present a measurement of the electric charge of the top quark using pp̅ collisions corresponding to an integrated luminosity of 2.7  fb-1 at the CDF II detector. We reconstruct tt̅ events in the lepton+jets final state. We use soft lepton taggers to determine the flavor of the b jets, which we use to reconstruct the top quark’s electric charge and exclude an exotic top quark with -4/3 charge at 95% confidence level. This is the strongest exclusion of the exotic charge scenario and the first to use soft leptons for this purpose.
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