Evidence for the Associated Production of a Single Top Quark and a Photon in Proton-Proton Collisions at √s = 13 TeV
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PhysRevLett.121.221802.pdf
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Author(s)
CMS Collaboration
Abercrombie, Daniel Robert
Allen, Brandon Leigh
Azzolini, Virginia
Baty, Austin Alan
Bauer, Gerry P
Bi, Ran
Brandt, Stephanie Akemi
Busza, Wit
Cali, Ivan Amos
Date Issued
November 2018
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Sirunyan, A. M. et al. “Evidence for the Associated Production of a Single Top Quark and a Photon in Proton-Proton Collisions at √s = 13 TeV.” Physical Review Letters 121, 22 (November 2018): 221802 © 2018 CERN for the CMS Collaboration
Version
Final published version
Abstract
The first evidence of events consistent with the production of a single top quark in association with a photon is reported. The analysis is based on proton-proton collisions at √s = 13 TeV and recorded by
the CMS experiment in 2016, corresponding to an integrated luminosity of 35.9 fb⁻¹. Events are selected by requiring the presence of a muon (μ), a photon (γ), an imbalance in transverse momentum from an undetected neutrino (ν), and at least two jets (j) of which exactly one is identified as associated with the hadronization of a b quark. A multivariate discriminant based on topological and kinematic event properties is employed to separate signal from background processes. An excess above the background only hypothesis is observed, with a significance of 4.4 standard deviations. A fiducial cross section is measured for isolated photons with transverse momentum greater than 25 GeV in the central region of the detector. The measured product of the cross section and branching fraction is σ(pp → tγj)B(t → μνb) 115 ± 17(stat) ± 30(syst) fb, which is consistent with the standard model prediction.
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
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.121.221802
