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First determination of the ρ parameter at √s=13TeV : probing the existence of a colourless C-odd three-gluon compound state

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    0540658 - FZÚ 2021 RIV DE eng J - Journal Article
    Antchev, G. - Aspell, P. - Atanassov, I. - Kašpar, Jan - Kundrát, Vojtěch - Lokajíček, Miloš V. - Procházka, Jiří
    First determination of the ρ parameter at √s=13TeV : probing the existence of a colourless C-odd three-gluon compound state.
    European Physical Journal C. Roč. 79, č. 9 (2019), s. 1-26, č. článku 785. ISSN 1434-6044. E-ISSN 1434-6052
    R&D Projects: GA MŠk(CZ) LTT17018
    Research Infrastructure: CERN-CZ - 90058
    Institutional support: RVO:68378271
    Keywords : elastic proton-proton scattering * LHC * Coulomb-hadronic interference
    Subject RIV: BF - Elementary Particles and High Energy Physics
    OBOR OECD: Particles and field physics
    Impact factor: 4.389, year: 2019
    http://hdl.handle.net/11104/0318297

    The TOTEM experiment at the LHC has performed the first measurement at √s = 13 TeV of the ρ parameter, obtaining the following results: ρ =0.09±0.01 and ρ =0.10±0.01, depending on different physics assumptions and mathematical modelling. The unprecedented precision of the ρ measurement, combined with the TOTEM total cross-section measurements in an energy range larger than 10 TeV (from 2.76 to 13 TeV), has implied the exclusion of all the models classified and published by COMPETE. The ρ results obtained by TOTEM are compatible with the theoretical model predictions. The very low-|t| reach allowed also to determine the absolute normalisation using the Coulomb amplitude for the first time at the LHC and obtain a new total proton-proton cross-section measurement σtot = (110.3±3.5) mb, completely independent from the previous TOTEM determination. Combining the two TOTEM results yields σtot = (110.5±2.4) mb.

    Permanent Link: http://hdl.handle.net/11104/0318297
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