Search for vector-like light-flavor quark partners in proton-proton collisions at √s = 8 TeV

CMS Collaboration, Shimaa Abu Zeid, Freya Blekman, Jorgen D'Hondt, Isabelle Helena De Bruyn, Kevin Deroover, Steven Lowette, Seth Moortgat, Lieselotte Moreels, Quentin Python, Kirill Skovpen, Stefaan Tavernier, Walter Van Doninck, Petra Van Mulders, Isis Marina Van Parijs, Annik Olbrechts, Nadir Daci

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


A search is presented for heavy vector-like quarks (VLQs) that couple only to light quarks in proton-proton collisions at √s = 8TeV at the LHC. The data were collected by the CMS experiment during 2012 and correspond to an integrated luminosity of 19.7fb−1. Both single and pair production of VLQs are considered. The singleproduction search is performed for down-type VLQs (electric charge of magnitude 1/3), while the pair-production search is sensitive to up-type (charge of magnitude 2/3) and down-type VLQs. Final states with at least one muon or one electron are considered. No significant excess over standard model expectations is observed, and lower limits on the mass of VLQs are derived. The lower limits range from 400 to 1800GeV, depending on the single-production cross section and the VLQ branching fractions B to W, Z, and Higgs bosons. When considering pair production alone, VLQs with masses below 845GeV are excluded forB(W) = 1.0, and below 685GeV for B(W) = 0.5, B(Z) = B(H) = 0.25. The results are more stringent than those previously obtained for single and pair production of VLQs coupled to light quarks.
Original languageEnglish
Article number072008
Number of pages68
JournalPhysical Review D
Issue number7
Publication statusPublished - 11 Apr 2018


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