Observation of the Z →ψ + - decay in pp collisions at s =13 TeV

This Letter presents the observation of the rare Z boson decay Z → ψlþl−. Here, ψ represents contributions from direct J=ψ and ψð2SÞ → J=ψX, lþl− is a pair of electrons or muons, and the J=ψ meson is detected via its decay to μþμ−. The sample of proton-proton collision data, collected by the CMS...

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Main Authors:	Sirunyan, A.M., Tumasyan, A. R., Adam, Wolfgang, Asilar, Ece, Bergauer, Thomas, 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/70337/ http://irep.iium.edu.my/70337/ http://irep.iium.edu.my/70337/ http://irep.iium.edu.my/70337/1/70337_Observation%20of%20the%20Z%20%E2%86%92%20%CF%88l%2Bl%E2%88%92%20Decay%20in%20pp%20Collisions_article.pdf http://irep.iium.edu.my/70337/2/70337_Observation%20of%20the%20Z%20%E2%86%92%20%CF%88l%2Bl%E2%88%92%20Decay%20in%20pp%20Collisions_scopus.pdf

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spelling	iium-703372019-07-15T01:35:24Z http://irep.iium.edu.my/70337/ Observation of the Z →ψ + - decay in pp collisions at s =13 TeV Sirunyan, A.M. Tumasyan, A. R. Adam, Wolfgang Asilar, Ece Bergauer, Thomas Md. Ali, Mohd. Adli Q Science (General) QC Physics This Letter presents the observation of the rare Z boson decay Z → ψlþl−. Here, ψ represents contributions from direct J=ψ and ψð2SÞ → J=ψX, lþl− is a pair of electrons or muons, and the J=ψ meson is detected via its decay to μþμ−. The sample of proton-proton collision data, collected by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV, corresponds to an integrated luminosity of 35.9 fb−1. The signal is observed with a significance in excess of 5 standard deviations. After subtraction of the ψð2SÞ → J=ψX contribution, the ratio of the branching fraction of the exclusive decay Z → J=ψlþl− to the decay Z → μþμ−μþμ− within a fiducial phase space is measured to be BðZ → J=ψlþl−Þ= BðZ → μþμ−μþμ−Þ ¼ 0.67 0.18ðstatÞ 0.05ðsystÞ. American Physical Society 2018-10-04 Article NonPeerReviewed application/pdf en http://irep.iium.edu.my/70337/1/70337_Observation%20of%20the%20Z%20%E2%86%92%20%CF%88l%2Bl%E2%88%92%20Decay%20in%20pp%20Collisions_article.pdf application/pdf en http://irep.iium.edu.my/70337/2/70337_Observation%20of%20the%20Z%20%E2%86%92%20%CF%88l%2Bl%E2%88%92%20Decay%20in%20pp%20Collisions_scopus.pdf Sirunyan, A.M. and Tumasyan, A. R. and Adam, Wolfgang and Asilar, Ece and Bergauer, Thomas and Md. Ali, Mohd. Adli (2018) Observation of the Z →ψ + - decay in pp collisions at s =13 TeV. Physical Review Letters, 121 (14). pp. 1-17. ISSN 0031-9007 E-ISSN 1079-7114 https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.121.141801 10.1103/PhysRevLett.121.141801
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 Asilar, Ece Bergauer, Thomas Md. Ali, Mohd. Adli Observation of the Z →ψ + - decay in pp collisions at s =13 TeV
description	This Letter presents the observation of the rare Z boson decay Z → ψlþl−. Here, ψ represents contributions from direct J=ψ and ψð2SÞ → J=ψX, lþl− is a pair of electrons or muons, and the J=ψ meson is detected via its decay to μþμ−. The sample of proton-proton collision data, collected by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV, corresponds to an integrated luminosity of 35.9 fb−1. The signal is observed with a significance in excess of 5 standard deviations. After subtraction of the ψð2SÞ → J=ψX contribution, the ratio of the branching fraction of the exclusive decay Z → J=ψlþl− to the decay Z → μþμ−μþμ− within a fiducial phase space is measured to be BðZ → J=ψlþl−Þ= BðZ → μþμ−μþμ−Þ ¼ 0.67 0.18ðstatÞ 0.05ðsystÞ.
format	Article
author	Sirunyan, A.M. Tumasyan, A. R. Adam, Wolfgang Asilar, Ece Bergauer, Thomas Md. Ali, Mohd. Adli
author_facet	Sirunyan, A.M. Tumasyan, A. R. Adam, Wolfgang Asilar, Ece Bergauer, Thomas Md. Ali, Mohd. Adli
author_sort	Sirunyan, A.M.
title	Observation of the Z →ψ + - decay in pp collisions at s =13 TeV
title_short	Observation of the Z →ψ + - decay in pp collisions at s =13 TeV
title_full	Observation of the Z →ψ + - decay in pp collisions at s =13 TeV
title_fullStr	Observation of the Z →ψ + - decay in pp collisions at s =13 TeV
title_full_unstemmed	Observation of the Z →ψ + - decay in pp collisions at s =13 TeV
title_sort	observation of the z →ψ + - decay in pp collisions at s =13 tev
publisher	American Physical Society
publishDate	2018
url	http://irep.iium.edu.my/70337/ http://irep.iium.edu.my/70337/ http://irep.iium.edu.my/70337/ http://irep.iium.edu.my/70337/1/70337_Observation%20of%20the%20Z%20%E2%86%92%20%CF%88l%2Bl%E2%88%92%20Decay%20in%20pp%20Collisions_article.pdf http://irep.iium.edu.my/70337/2/70337_Observation%20of%20the%20Z%20%E2%86%92%20%CF%88l%2Bl%E2%88%92%20Decay%20in%20pp%20Collisions_scopus.pdf
first_indexed	2023-09-18T21:39:52Z
last_indexed	2023-09-18T21:39:52Z
_version_	1777413067715379200

Observation of the Z →ψ + - decay in pp collisions at s =13 TeV

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