Search for Single Production of a Vector-Like T Quark Decaying to a Z Boson and a Top Quark in Proton–proton Collisions at √s = 13 TeV
Name
1-s2.0-S0370269318303204-main.pdf
Size
1.47 MB
Format
Adobe PDF
Checksum (MD5)
0ebcba8713c7e4e0170e67a7f622ea34
Author(s)
CMS Collaboration
Abercrombie, Daniel Robert
Allen, Brandon Leigh
Azzolini, Virginia
Barbieri, Richard Alexander
Baty, Austin Alan
Bi, Ran
Brandt, Stephanie Akemi
Busza, Wit
Cali, Ivan Amos
Date Issued
April 2018
Journal
Physics Letters B
Publisher
Elsevier
Citation
Sirunyan, A.M. et al. “Search for Single Production of a Vector-Like T Quark Decaying to a Z Boson and a Top Quark in Proton–proton Collisions at √s = 13 TeV.” Physics Letters B 781 (June 2018): 574–600 © 2018 The Author(s)
Version
Final published version
Abstract
A search is presented for single production of a vector-like quark (T) decaying to a Z boson and a top quark, with the Z boson decaying leptonically and the top quark decaying hadronically. The search uses data collected by the CMS experiment in proton–proton collisions at a center-of-mass energy of 13 TeV in 2016, corresponding to an integrated luminosity of 35.9fb⁻¹. The presence of forward jets is a particular characteristic of single production of vector-like quarks that is used in the analysis. For the first time, different T quark width hypotheses are studied, from negligibly small to 30% of the new particle mass. At the 95% confidence level, the product of cross section and branching fraction is excluded above values in the range 0.26–0.04 pb for T quark masses in the range 0.7–1.7 TeV, assuming a negligible width. A similar sensitivity is observed for widths of up to 30% of the T quark mass. The production of a heavy Z′ boson decaying to Tt, with T→ tZ, is also searched for, and limits on the product of cross section and branching fractions for this process are set between 0.13 and 0.06 pb for Z′ boson masses in the range from 1.5 to 2.5 TeV. Keywords: CMS; Physics; Vector-like quarks
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Creative Commons Attribution 4.0 International License
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1016/J.PHYSLETB.2018.04.036
