Combined search for the quarks of a sequential fourth generation

CMS Collaboration; Chatrchyan, S; Khachatryan, V; Sirunyan, A M; Tumasyan, A; Amsler, C; Chiochia, V; De Visscher, S; Favaro, C; Ivova Rikova, M; Millan Mejias, B; Otiougova, P; Robmann, P; Snoek, H; Tupputi, S; Verzetti, M

doi:10.1103/PhysRevD.86.112003

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CMS Collaboration, Chatrchyan, S., Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Amsler, C., Chiochia, V., De Visscher, S., Favaro, C., Ivova Rikova, M., Millan Mejias, B., Otiougova, P., Robmann, P., Snoek, H., Tupputi, S., & Verzetti, M. (2012). Combined search for the quarks of a sequential fourth generation. Physical Review. D, Particles, Fields, Gravitation and Cosmology, 86(11), 112003. https://doi.org/10.1103/PhysRevD.86.112003

Abstract

Results are presented from a search for a fourth generation of quarks produced singly or in pairs in a data set corresponding to an integrated luminosity of 5 fb-1 recorded by the CMS experiment at the LHC in 2011. A novel strategy has been developed for a combined search for quarks of the up and down type in decay channels with at least one isolated muon or electron. Limits on the mass of the fourth-generation quarks and the relevant Cabibbo-Kobayashi-Maskawa matrix elements are derived in the context of a simple extension of the st