Observation of Enhanced Long-Range Elliptic Anisotropies Inside High-Multiplicity Jets in 𝑝⁢𝑝 Collisions at √𝑠=13  TeV

Belyaev, A.; Boos, E.E.; Ershov, A.A.; A, G.; Kaminskiy, A.; Khein, L.; Kodolova, O.L.; Korotkikh, V.L.; Obraztsov, S.V.; Petrushanko, S.V.; Savrin, V.I.; Snigirev, A.M.; Vardanyan, I.; CMS, C.

Авторы: Belyaev Andrey, Boos E.E., Ershov A.A., A Gribushin, Kaminskiy A., Khein L., Kodolova O.L., Korotkikh V.L., Obraztsov S.V., Petrushanko S.V., Savrin V.I., Snigirev A.M., Vardanyan I., CMS Collaboration
Журнал: Physical Review Letters
Том: 133
Год издания: 2024
Издательство: American Physical Society
Местоположение издательства: United States
Номер статьи: 142301
DOI: 10.1103/PhysRevLett.133.142301
Аннотация: A search for partonic collective effects inside jets produced in proton-proton collisions is performed via correlation measurements of charged constituents using the CMS detector at the CERN LHC. The analysis uses data collected at a center-of-mass energy of s√ = 13 TeV, corresponding to an integrated luminosity of 138 fb−1. Jets are reconstructed with the anti-kT algorithm with a distance parameter of 0.8 and are required to have transverse momentum greater than 550 GeV and pseudorapidity |η| < 1.6. Two-particle correlations among the charged constituents within the jets are studied as functions of the particles' azimuthal angle and pseudorapidity separations (Δϕ∗ and Δη∗) in a jet coordinate basis, where constituents' η∗, ϕ∗ are defined relative to the direction of the jet. The correlation functions are studied in classes of in-jet charged-particle multiplicity up to Njch ≈ 100. Fourier harmonics are extracted from long-range azimuthal correlation functions to characterize azimuthal anisotropy for |Δη∗| > 2. For low-Njch, the long-range elliptic anisotropic harmonic, v∗2, is observed to decrease with Njch. This trend is well described by Monte Carlo event generators. However, a rising trend for v∗2 emerges at Njch ≳ 80, hinting at a possible onset of collective behavior, which is not reproduced by the models tested. This observation yields new insights into the dynamics of parton fragmentation processes in the vacuum.
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Observation of Enhanced Long-Range Elliptic Anisotropies Inside High-Multiplicity Jets in 𝑝⁢𝑝 Collisions at √𝑠=13 TeVстатья

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