Observation of Enhanced Long-Range Elliptic Anisotropies Inside High-Multiplicity Jets in <math display="inline"><mi>p</mi><mi>p</mi></math> Collisions at <math display="inline"><mrow><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></mrow></math> - INSPIRE

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Observation of Enhanced Long-Range Elliptic Anisotropies Inside High-Multiplicity Jets in $p p$ Collisions at $\sqrt{s} = 13 TeV$

CMS

Collaboration

Dec 28, 2023

20 pages

Published in:

Phys.Rev.Lett. 133 (2024) 14, 142301

Published: Sep 30, 2024

e-Print:

2312.17103 [hep-ex]

DOI:

10.1103/PhysRevLett.133.142301 (publication)

Report number:

CMS-HIN-21-013,
CERN-EP-2023-281

Experiments:

CERN-LHC-CMS

View in:

reference search14 citations

Citations per year

Abstract: (APS)

A 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 uses data collected at a center-of-mass energy of

\sqrt{s} = 13 TeV

, corresponding to an integrated luminosity of

138 {fb}^{- 1}

. Jets are reconstructed with the anti-

k_{T}

algorithm with a distance parameter of 0.8 and are required to have transverse momentum greater than 550 GeV and pseudorapidity

| η^{jet} | < 1.6

. Two-particle correlations among the charged particles within the jets are studied as functions of the particles’ azimuthal angle and pseudorapidity separations (

Δ ϕ^{*}

and

Δ η^{*}

) 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

N_{ch}^{j} \approx 100

. Fourier harmonics are extracted from long-range azimuthal correlation functions to characterize azimuthal anisotropy for

| Δ η^{*} | > 2

. For low-

N_{ch}^{j}

jets, the long-range elliptic anisotropic harmonic,

v_{2}^{*}

, is observed to decrease with

N_{ch}^{j}

. This trend is well described by Monte Carlo event generators. However, a rising trend for

v_{2}^{*}

emerges at

N_{ch}^{j} ≳ 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 jet evolution in the vacuum.

Note:

All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-21-013 (CMS Public Pages)

p p: scattering
p p: colliding beams
correlation: two-particle
charged particle: multiplicity
parton: fragmentation
multiplicity: dependence
angular distribution: anisotropy
angular correlation: long-range
correlation function
collective phenomena

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