Observation of proton-tagged, central (semi)exclusive production of high-mass lepton pairs in pp collisions at 13 TeV with the CMS-TOTEM precision proton spectrometer

The process pp → p` +` −p (∗) , with ` +` − a muon or an electron pair produced at midrapidity with mass larger than 110 GeV, has been observed for the first time at the LHC in pp collisions at √ s = 13 TeV. One of the two scattered protons is measured in the CMS-TOTEM precision proton spe...

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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 English
Published:	Springer Verlag 2018
Subjects:	Q Science (General) QC Physics
Online Access:	http://irep.iium.edu.my/70412/ http://irep.iium.edu.my/70412/ http://irep.iium.edu.my/70412/ http://irep.iium.edu.my/70412/1/70412_Observation%20of%20proton-tagged%2C%20central%20%28semi%29exclusive_article.pdf http://irep.iium.edu.my/70412/7/70412_Observation%20of%20proton-tagged%2C%20central%20%28semi%29exclusive_scopus.pdf http://irep.iium.edu.my/70412/8/70412_Observation%20of%20proton-tagged%2C%20central%20%28semi%29exclusive_wos.pdf

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spelling	iium-704122019-02-04T04:21:47Z http://irep.iium.edu.my/70412/ Observation of proton-tagged, central (semi)exclusive production of high-mass lepton pairs in pp collisions at 13 TeV with the CMS-TOTEM precision proton spectrometer Sirunyan, A. M. Tumasyan, A. R. Adam, Wolfgang Ambrogi, Federico Asilar, Ece Md. Ali, Mohd. Adli Q Science (General) QC Physics The process pp → p` +` −p (∗) , with ` +` − a muon or an electron pair produced at midrapidity with mass larger than 110 GeV, has been observed for the first time at the LHC in pp collisions at √ s = 13 TeV. One of the two scattered protons is measured in the CMS-TOTEM precision proton spectrometer (CT-PPS), which operated for the first time in 2016. The second proton either remains intact or is excited and then dissociates into a low-mass state p∗ , which is undetected. The measurement is based on an integrated luminosity of 9.4 fb−1 collected during standard, high-luminosity LHC operation. A total of 12 µ +µ − and 8 e+e − pairs with m(` +` −) > 110 GeV, and matching forward proton kinematics, are observed, with expected backgrounds of 1.49 ± 0.07 (stat) ± 0.53 (syst) and 2.36 ± 0.09 (stat) ± 0.47 (syst), respectively. This corresponds to an excess of more than five standard deviations over the expected background. The present result constitutes the first observation of proton-tagged γγ collisions at the electroweak scale. This measurement also demonstrates that CT-PPS performs according to the design specifications. Springer Verlag 2018-07-01 Article PeerReviewed application/pdf en http://irep.iium.edu.my/70412/1/70412_Observation%20of%20proton-tagged%2C%20central%20%28semi%29exclusive_article.pdf application/pdf en http://irep.iium.edu.my/70412/7/70412_Observation%20of%20proton-tagged%2C%20central%20%28semi%29exclusive_scopus.pdf application/pdf en http://irep.iium.edu.my/70412/8/70412_Observation%20of%20proton-tagged%2C%20central%20%28semi%29exclusive_wos.pdf Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Ambrogi, Federico and Asilar, Ece and Md. Ali, Mohd. Adli (2018) Observation of proton-tagged, central (semi)exclusive production of high-mass lepton pairs in pp collisions at 13 TeV with the CMS-TOTEM precision proton spectrometer. Journal of High Energy Physics, 2018 (7). pp. 1-44. ISSN 1126-6708 E-ISSN 1029-8479 https://link.springer.com/content/pdf/10.1007%2FJHEP07%282018%29153.pdf 10.1007/JHEP07(2018)153
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English 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 Observation of proton-tagged, central (semi)exclusive production of high-mass lepton pairs in pp collisions at 13 TeV with the CMS-TOTEM precision proton spectrometer
description	The process pp → p` +` −p (∗) , with ` +` − a muon or an electron pair produced at midrapidity with mass larger than 110 GeV, has been observed for the first time at the LHC in pp collisions at √ s = 13 TeV. One of the two scattered protons is measured in the CMS-TOTEM precision proton spectrometer (CT-PPS), which operated for the first time in 2016. The second proton either remains intact or is excited and then dissociates into a low-mass state p∗ , which is undetected. The measurement is based on an integrated luminosity of 9.4 fb−1 collected during standard, high-luminosity LHC operation. A total of 12 µ +µ − and 8 e+e − pairs with m(` +` −) > 110 GeV, and matching forward proton kinematics, are observed, with expected backgrounds of 1.49 ± 0.07 (stat) ± 0.53 (syst) and 2.36 ± 0.09 (stat) ± 0.47 (syst), respectively. This corresponds to an excess of more than five standard deviations over the expected background. The present result constitutes the first observation of proton-tagged γγ collisions at the electroweak scale. This measurement also demonstrates that CT-PPS performs according to the design specifications.
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	Observation of proton-tagged, central (semi)exclusive production of high-mass lepton pairs in pp collisions at 13 TeV with the CMS-TOTEM precision proton spectrometer
title_short	Observation of proton-tagged, central (semi)exclusive production of high-mass lepton pairs in pp collisions at 13 TeV with the CMS-TOTEM precision proton spectrometer
title_full	Observation of proton-tagged, central (semi)exclusive production of high-mass lepton pairs in pp collisions at 13 TeV with the CMS-TOTEM precision proton spectrometer
title_fullStr	Observation of proton-tagged, central (semi)exclusive production of high-mass lepton pairs in pp collisions at 13 TeV with the CMS-TOTEM precision proton spectrometer
title_full_unstemmed	Observation of proton-tagged, central (semi)exclusive production of high-mass lepton pairs in pp collisions at 13 TeV with the CMS-TOTEM precision proton spectrometer
title_sort	observation of proton-tagged, central (semi)exclusive production of high-mass lepton pairs in pp collisions at 13 tev with the cms-totem precision proton spectrometer
publisher	Springer Verlag
publishDate	2018
url	http://irep.iium.edu.my/70412/ http://irep.iium.edu.my/70412/ http://irep.iium.edu.my/70412/ http://irep.iium.edu.my/70412/1/70412_Observation%20of%20proton-tagged%2C%20central%20%28semi%29exclusive_article.pdf http://irep.iium.edu.my/70412/7/70412_Observation%20of%20proton-tagged%2C%20central%20%28semi%29exclusive_scopus.pdf http://irep.iium.edu.my/70412/8/70412_Observation%20of%20proton-tagged%2C%20central%20%28semi%29exclusive_wos.pdf
first_indexed	2023-09-18T21:39:58Z
last_indexed	2023-09-18T21:39:58Z
_version_	1777413073736302592

Observation of proton-tagged, central (semi)exclusive production of high-mass lepton pairs in pp collisions at 13 TeV with the CMS-TOTEM precision proton spectrometer

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