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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 ASEP0502336
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleObservation 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 authors2357
    Article number153
    Source TitleJournal of High Energy Physics. - : Springer - ISSN 1029-8479
    Roč. 2018, č. 7 (2018), s. 1-45
    Number of pages45 s.
    Languageeng - English
    CountryUS - United States
    Keywordsforward physics ; proton-proton scattering ; photon-production
    Subject RIVBF - Elementary Particles and High Energy Physics
    OECD categoryParticles and field physics
    Institutional supportFZU-D - RVO:68378271
    UT WOS000440090400002
    EID SCOPUS85051832717
    DOI10.1007/JHEP07(2018)153
    AnnotationThe 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.
    WorkplaceInstitute of Physics
    ContactKristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
    Year of Publishing2019
Number of the records: 1