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Search for the production of an excited bottom quark decaying to tW in proton-proton collisions at s=8 √s=8 TeV

CMS Collaboration; Khachatryan, V.; Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M.; Friedl, M.; Frühwirth, R.; Ghete, V.M.; Hartl, C.; Hörmann, N.; Hrubec, J.; Jeitler, M.; Knünz, V.; ... mehr

Abstract (englisch): A search is presented for a singly produced excited bottom quark (b * ) decaying to a top quark and a W boson in the all-hadronic, lepton+jets, and dilepton final states in proton-proton collisions at s = 8 s√=8 TeV recorded by the CMS experiment at the CERN LHC. Data corresponding to an integrated luminosity of 19.7 fb −1 are used. No significant excess of events is observed with respect to standard model expectations. We set limits at 95% confidence on the product of the b * quark production cross section and its branching fraction to tW. The cross section limits are interpreted for scenarios including left-handed, right-handed, and vector-like couplings of the b * quark and are presented in the two-dimensional coupling plane based on the production and decay coupling constants. The masses of the left-handed, right-handed, and vector-like b * quark states are excluded at 95% confidence below 1390, 1430, and 1530 GeV, respectively, for benchmark couplings. This analysis gives the most stringent limits on the mass of the b ∗ quark to date.

Zugehörige Institution(en) am KIT Institut für Experimentelle Kernphysik (IEKP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1007/JHEP01(2016)166
ISSN: 1126-6708
URN: urn:nbn:de:swb:90-540047
KITopen ID: 1000054004
Erschienen in Journal of High Energy Physics
Band 2016
Heft 1
Seiten 1-44
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
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