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oai:ebyu-rdlopen.rawdatalibrary.net:ebyu/113172026-10-18T20:26:23Zopenairedrivercom_ebyu_10000col_ebyu_10001

Observation of Enhanced Long-Range Elliptic Anisotropies Inside High-Multiplicity Jets in pp Collisions at √s = 13 TeVHayrapetyan, A.Tumasyan, A.Adam, W.Andrejkovic, J.W.Bergauer, T.Chatterjee, S.Damanakis, K.Dragicevic, M.Hussain, P.S.Jeitler, M.Krammer, N.Li, A.Liko, D.Mikulec, I.Schieck, J.Schöfbeck, R.Schwarz, D.Sonawane, M.Templ, S.Waltenberger, W.Wulz, C.-E.Darwish, M.R.Janssen, T.Van Mechelen, P.Bols, E.S.D'Hondt, J.Dansana, S.De Moor, A.Delcourt, M.El Faham, H.Lowette, S.Makarenko, I.Müller, D.Sahasransu, A.R.Tavernier, S.Tytgat, M.Van Onsem, G.P.Van Putte, S.Vannerom, D.Clerbaux, B.Das, A.K.De Lentdecker, G.Favart, L.Gianneios, P.Hohov, D.Jaramillo, J.Khalilzadeh, A.Lee, K.Mahdavikhorrami, M.Malara, A.Colliding beam acceleratorsHadronsNegative ionsPhotonsPositive ionsA-centerCenter-of-mass energiesCMS detectorsCollective effectsCorrelation functionCorrelation measurementHigh multiplicityMeasurements ofProton proton collisionsPseudorapiditiesanisotropyarticlecontrolled studyhumanA search for collective effects inside jets produced in proton-proton collisions is performed via correlation measurements of charged particles using the CMS detector at the CERN LHC. The analysis ffiffi 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 (equation presented). Two-particle correlations among the charged particles within the jets are studied as functions of the particles' azimuthal angle and pseudorapidity separations (Δϕ* and Δη*) in a jet coordinate basis, where particles' 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 (equation presented). For low-Njch jets, 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 (equation presented), 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 jet evolution in the vacuum. © 2024 CERN, for the CMS Collaboration.American Physical Society2024Articlehttps://rdlopen.rawdatalibrary.net/r/ebyu/11317https://doi.org/10.1103/physrevlett.133.1423010031-9007enPhysical Review Lettersinfo:eu-repo/semantics/openAccessinfo:eu-repo/semantics/articlehttps://ebyu-rdlopen.rawdatalibrary.net/tr/items/ebyu/11317