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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
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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, ORCIDNumber of authors 2357 Article number 153 Source Title Journal of High Energy Physics. - : Springer - ISSN 1029-8479
Roč. 2018, č. 7 (2018), s. 1-45Number 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 https://doi.org/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
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