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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| Format: | Article |
| Language: | English English |
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American Physical Society
2018
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| Online Access: | 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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| 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. |
| building | IIUM Repository |
| collection | Online Access |
| 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. |
| first_indexed | 2025-11-14T17:22:19Z |
| format | Article |
| id | iium-70337 |
| institution | International Islamic University Malaysia |
| institution_category | Local University |
| language | English English |
| last_indexed | 2025-11-14T17:22:19Z |
| publishDate | 2018 |
| publisher | American Physical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| 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 |
| 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 |
| title | 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_short | 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 |
| topic | Q Science (General) QC Physics |
| 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 |