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/ http://irep.iium.edu.my/70235/ http://irep.iium.edu.my/70235/ 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

id	iium-70235
recordtype	eprints
spelling	iium-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 E-ISSN 1079-7114 https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.121.221802 10.1103/PhysRevLett.121.221802
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
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/ http://irep.iium.edu.my/70235/ http://irep.iium.edu.my/70235/ 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
first_indexed	2023-09-18T21:39:42Z
last_indexed	2023-09-18T21:39:42Z
_version_	1777413057236959232

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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