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Evidence for the associated production of a single top quark and a photon in proton-proton collisions at s =13 TeV

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 ffiffi s p ¼ 13 TeV and recorded by the CMS experiment in 2016, corresponding to an integrated luminosity of 35.9 fb−1....

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Main Authors: Sirunyan, A. M., Tumasyan, A. R., Adam, Wolfgang, Ambrogi, Federico, Asilar, Ece, Md. Ali, Mohd. Adli
Format: Article
Language:English
English
Published: American Physical Society 2018
Subjects:
Q Science (General)
QC Physics
Online Access:http://irep.iium.edu.my/70235/1/70235_Evidence%20for%20the%20Associated%20Production%20of%20a%20Single%20Top_article.pdf
http://irep.iium.edu.my/70235/8/70235_Evidence%20for%20the%20Associated%20Production_scopus.pdf
http://irep.iium.edu.my/70235/
https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.121.221802
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spelling my.iium.irep.702352019-07-15T01:39:20Z http://irep.iium.edu.my/70235/ Evidence for the associated production of a single top quark and a photon in proton-proton collisions at s =13 TeV Sirunyan, A. M. Tumasyan, A. R. Adam, Wolfgang Ambrogi, Federico Asilar, Ece Md. Ali, Mohd. Adli Q Science (General) QC Physics 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 ffiffi s p ¼ 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 backgroundonly 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 σðpp → tγjÞBðt → μνbÞ ¼ 115 17ðstatÞ 30ðsystÞ fb, which is consistent with the standard model prediction. American Physical Society 2018-11-29 Article NonPeerReviewed application/pdf en http://irep.iium.edu.my/70235/1/70235_Evidence%20for%20the%20Associated%20Production%20of%20a%20Single%20Top_article.pdf application/pdf en http://irep.iium.edu.my/70235/8/70235_Evidence%20for%20the%20Associated%20Production_scopus.pdf Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Ambrogi, Federico and Asilar, Ece and Md. Ali, Mohd. Adli (2018) 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). pp. 1-18. ISSN 0031-9007 https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.121.221802 10.1103/PhysRevLett.121.221802
institution Universiti Islam Antarabangsa Malaysia
building IIUM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider International Islamic University Malaysia
content_source IIUM Repository (IREP)
url_provider http://irep.iium.edu.my/
language English
English
topic Q Science (General)
QC Physics
spellingShingle Q Science (General)
QC Physics
Sirunyan, A. M.
Tumasyan, A. R.
Adam, Wolfgang
Ambrogi, Federico
Asilar, Ece
Md. Ali, Mohd. Adli
Evidence for the associated production of a single top quark and a photon in proton-proton collisions at s =13 TeV
description 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 ffiffi s p ¼ 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 backgroundonly 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 σðpp → tγjÞBðt → μνbÞ ¼ 115 17ðstatÞ 30ðsystÞ fb, which is consistent with the standard model prediction.
format Article
author Sirunyan, A. M.
Tumasyan, A. R.
Adam, Wolfgang
Ambrogi, Federico
Asilar, Ece
Md. Ali, Mohd. Adli
author_facet Sirunyan, A. M.
Tumasyan, A. R.
Adam, Wolfgang
Ambrogi, Federico
Asilar, Ece
Md. Ali, Mohd. Adli
author_sort Sirunyan, A. M.
title Evidence for the associated production of a single top quark and a photon in proton-proton collisions at s =13 TeV
title_short Evidence for the associated production of a single top quark and a photon in proton-proton collisions at s =13 TeV
title_full Evidence for the associated production of a single top quark and a photon in proton-proton collisions at s =13 TeV
title_fullStr Evidence for the associated production of a single top quark and a photon in proton-proton collisions at s =13 TeV
title_full_unstemmed Evidence for the associated production of a single top quark and a photon in proton-proton collisions at s =13 TeV
title_sort evidence for the associated production of a single top quark and a photon in proton-proton collisions at s =13 tev
publisher American Physical Society
publishDate 2018
url http://irep.iium.edu.my/70235/1/70235_Evidence%20for%20the%20Associated%20Production%20of%20a%20Single%20Top_article.pdf
http://irep.iium.edu.my/70235/8/70235_Evidence%20for%20the%20Associated%20Production_scopus.pdf
http://irep.iium.edu.my/70235/
https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.121.221802
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score 13.211869

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