Search for New Bottomlike Quark Pair Decays Q Q-Bar to (T W- ) (T-Bar W -) in Same-Charge Dilepton Events

We report the most restrictive direct limits on masses of fourth-generation down-type quarks b{prime}, and quark-like composite fermions (B or T{sub 5/3}), decaying promptly to tW{sup {-+}}. We search for a significant excess of events with two same-charge leptons (e, {mu}), several hadronic jets, a...

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Veröffentlicht in:	Physical review letters 2012-04, Vol.104 (9)
Hauptverfasser:	Aaltonen, T., /Helsinki Inst. of Phys, Adelman, J., /Chicago U., EFI, Alvarez Gonzalez, B., /Cantabria Inst. of Phys, Amerio, S., /INFN, Padua, Amidei, D., /Michigan U., Anastassov, A., /Northwestern U., Annovi, A., /Frascati, Antos, J., /Comenius U., Apollinari, G., /Fermilab, Apresyan, A., /Purdue U., Arisawa, T., /Waseda U., Artikov, A., /Dubna, JINR, Asaadi, J., /Texas A-M, Ashmanskas, W., Attal, A., /Barcelona, IFAE, Aurisano, A., Azfar, F., /Oxford U., Badgett, W., Barbaro-Galtieri, A., /LBL, Berkeley, Barnes, V.E., Barnett, B.A., /Johns Hopkins U. /INFN, Pisa /Comenius U. /MIT /TRIUMF /INFN, Pisa /University Coll. London /Johns Hopkins U. /INFN, Pisa /Wisconsin U., Madison /Duke U. /Fermilab /CERN /Rockefeller U. /Fermilab /INFN, Padua /University Coll. London /Argonne, HEP /Brandeis U. /Johns Hopkins U. /Duke U. /Rochester U. /Rochester U. /Purdue U. /Pittsburgh U. /UC, Santa Barbara /UC, Santa Barbara /Illinois U., Urbana /INFN, Bologna /Michigan State U. /Chicago U., EFI /Dubna, JINR, /more authors
Format:	Artikel
Sprache:	eng
Schlagworte:	Experiment-HEP,HEPEX FERMILAB FERMILAB COLLIDER DETECTOR FERMIONS LEPTONS LUMINOSITY PARTICLE ACCELERATORS QUARKS TRANSVERSE ENERGY
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Zusammenfassung:	We report the most restrictive direct limits on masses of fourth-generation down-type quarks b{prime}, and quark-like composite fermions (B or T{sub 5/3}), decaying promptly to tW{sup {-+}}. We search for a significant excess of events with two same-charge leptons (e, {mu}), several hadronic jets, and missing transverse energy. An analysis of data from p{bar p} collisions with an integrated luminosity of 2.7 fb{sup -1} collected with the CDF II detector at Fermilab yields no evidence for such a signal, setting mass limits m{sub b{prime}}, m{sub B} > 338 GeV/c{sup 2} and m{sub T{sub 5/3}} > 365 GeV/c{sup 2} at 95% confidence level.
ISSN:	0031-9007 1079-7114