Search for vectorlike light-flavor quark partners in proton-proton collisions at s =8 TeV

Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Asilar, Ece and Bergauer, Thomas and Md. Ali, Mohd. Adli (2018) Search for vectorlike light-flavor quark partners in proton-proton collisions at s =8 TeV. Physical Review D, 97 (7). 072008-1-072008-36. ISSN 2470-0010 E-ISSN 2470-0029

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Abstract

A search is presented for heavy vectorlike quarks (VLQs) that couple only to light quarks in protonproton collisions at ffiffi s p ¼ 8 TeV at the LHC. The data were collected by the CMS experiment during 2012 and correspond to an integrated luminosity of 19.7 fb−1. Both single and pair production of VLQs are considered. The single-production 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 1800 GeV, 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 845 GeV are excluded for BðWÞ ¼ 1.0, and below 685 GeV for BðWÞ ¼ 0.5, BðZÞ ¼ BðHÞ ¼ 0.25. The results are more stringent than those previously obtained for single and pair production of VLQs coupled to light quarks.

Item Type:	Article (Journal)
Additional Information:	7861/65674
Uncontrolled Keywords:	Vectorlike light-flavor; Quark partners; Proton-proton collisions at ffiffi s p = 8 TeV
Subjects:	Q Science > Q Science (General) Q Science > QC Physics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science Kulliyyah of Science > Department of Physics
Depositing User:	Dr Mohd Adli MD Ali
Date Deposited:	14 Aug 2018 09:43
Last Modified:	14 Aug 2018 09:43
URI:	http://irep.iium.edu.my/id/eprint/65674

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