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Measurement of the sensitivity of two-particle correlations in pp collisions to the presence of hard scatterings

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    0579138 - FZÚ 2024 RIV US eng J - Journal Article
    Aad, G. - Abbott, B. - Abeling, K. - Chudoba, Jiří - Federičová, Pavla - Hejbal, Jiří - Jačka, Petr - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Latoňová, Věra - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … Total 2930 authors
    Measurement of the sensitivity of two-particle correlations in pp collisions to the presence of hard scatterings.
    Physical Review Letters. Roč. 131, č. 16 (2023), č. článku 162301. ISSN 0031-9007. E-ISSN 1079-7114
    Research Infrastructure: CERN-CZ III - 90240
    Institutional support: RVO:68378271
    Keywords : underlying event * charged particle * jet * angular correlation * sensitivity
    OECD category: Particles and field physics
    Impact factor: 8.6, year: 2022
    Method of publishing: Open access

    A key open question in the study of multiparticle production in high-energy pp collisions is the relationship between the “ridge”—i.e., the observed azimuthal correlations between particles in the underlying event that extend over all rapidities—and hard or semihard scattering processes. In particular, it is not known whether jets or their soft fragments are correlated with particles in the underlying event. To address this question, two-particle correlations are measured in pp collisions at s=13  TeV using data collected by the ATLAS experiment at the LHC, with an integrated luminosity of 15.8  pb-1, in two different configurations. In the first case, charged particles associated with jets are excluded from the correlation analysis, while in the second case, correlations are measured between particles within jets and charged particles from the underlying event. Second-order flow coefficients, v2, are presented as a function of event multiplicity and transverse momentum.

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