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

Abstract : 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 sqrt(s) = 8 TeV recorded by the CMS experiment at the CERN LHC. Data corresponding to an integrated luminosity of 19.7 inverse-femtobarns 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.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-01206391
Contributor : Sylvie Flores <>
Submitted on : Tuesday, September 29, 2015 - 7:17:00 AM
Last modification on : Tuesday, November 19, 2019 - 2:40:26 AM

### Citation

V. Khachatryan, M. Besançon, F. Couderc, M. Dejardin, D. Denegri, et al.. Search for the production of an excited bottom quark decaying to tW in proton-proton collisions at sqrt(s) = 8 TeV. Journal of High Energy Physics, Springer Verlag (Germany), 2016, 2016(01), pp.166. ⟨10.1007/JHEP01(2016)166⟩. ⟨in2p3-01206391⟩

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