TY - JOUR
T1 - Search for vector-like light-flavor quark partners in proton-proton collisions at √s = 8 TeV
AU - CMS Collaboration
AU - Abu Zeid, Shimaa
AU - Blekman, Freya
AU - D'Hondt, Jorgen
AU - De Bruyn, Isabelle Helena
AU - Deroover, Kevin
AU - Lowette, Steven
AU - Moortgat, Seth
AU - Moreels, Lieselotte
AU - Python, Quentin
AU - Skovpen, Kirill
AU - Tavernier, Stefaan
AU - Van Doninck, Walter
AU - Van Mulders, Petra
AU - Van Parijs, Isis Marina
AU - Olbrechts, Annik
AU - Daci, Nadir
PY - 2018/4/11
Y1 - 2018/4/11
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85046816352&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.97.072008
DO - 10.1103/PhysRevD.97.072008
M3 - Article
VL - 97
JO - Physical Review D
JF - Physical Review D
SN - 2470-0010
IS - 7
M1 - 072008
ER -