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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

SYSNO ASEP	0502336
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
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
Author(s)	Sirunyan, A.M. (AM) Tumasyan, A. (AM) Adam, W. (AT) Kašpar, Jan (FZU-D)_{RID, ORCID} Kundrát, Vojtěch (FZU-D)_{RID, ORCID} Lokajíček, Miloš V. (FZU-D)_{RID, ORCID} Procházka, Jiří (FZU-D)_{RID, ORCID}
Number of authors	2357
Article number	153
Source Title	Journal of High Energy Physics. - : Springer - ISSN 1029-8479 Roč. 2018, č. 7 (2018), s. 1-45
Number of pages	45 s.
Language	eng - English
Country	US - United States
Keywords	forward physics ; proton-proton scattering ; photon-production
Subject RIV	BF - Elementary Particles and High Energy Physics
OECD category	Particles and field physics
Institutional support	FZU-D - RVO:68378271
UT WOS	000440090400002
EID SCOPUS	85051832717
DOI	10.1007/JHEP07(2018)153
Annotation	The process pp → pℓ + ℓ − p () , with ℓ + ℓ − 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(ℓ + ℓ − ) > 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.
Workplace	Institute of Physics
Contact	Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
Year of Publishing	2019

Number of the records: 1