Projections of two-particle correlations onto transverse rapidity in <math><mi>Au</mi><mo>+</mo><mi>Au</mi></math> collisions at <math><mrow><msqrt><msub><mi>s</mi><mrow><mi>N</mi><mi>N</mi></mrow></msub></msqrt><mo>=</mo><mn>200</mn><mo> </mo><mi>GeV</mi></mrow></math> at STAR

Abdallah, Mohamed; Aboona, Bassam; Adam, Jaroslav; Adamczyk, Leszek; Adams, Joseph; Adkins, Kevin; Agakishiev, Geydar; Aggarwal, Ishu; Aggarwal, Madan; Ahammed, Zubayer

doi:10.1103/PhysRevC.106.044906

Projections of two-particle correlations onto transverse rapidity in $Au + Au$ collisions at $\sqrt{s_{N N}} = 200 GeV$ at STAR

STAR

Collaboration

Apr 25, 2022

23 pages

Published in:

Phys.Rev.C 106 (2022) 4, 044906

Published: Oct 18, 2022

e-Print:

2204.11661 [nucl-ex]

DOI:

10.1103/PhysRevC.106.044906 (publication)

Experiments:

BNL-RHIC-STAR

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Abstract: (APS)

Two-particle correlation measurements projected onto two-dimensional, transverse rapidity coordinates

(y_{T 1}, y_{T 2})

provide an independent, orthogonal view of the multidimensional correlation distribution that is most often studied via angular projections. As such, these independent transverse projections allow access to manifestations of dynamical fluctuations in relativistic heavy-ion collisions that angular-correlation measurements may not be sensitive to. We report nonidentified charged-particle correlations for

Au + Au

minimum-bias collisions at

\sqrt{s_{NN}} = 200

GeV taken by the STAR experiment at the Relativistic Heavy-Ion Collider (RHIC). Correlations are presented as two-dimensional functions of transverse rapidity for like-sign, unlike-sign, and all charged-particle pairs, as well as for particle pairs whose relative azimuthal angles lie on the near-side, the away-side, or at all relative azimuth. The correlations are constructed using charged particles with transverse momentum

p_{T} \geq 0.15

GeV / c

, pseudorapidity from

- 1

to 1, and azimuthal angles from

- π

to

π

. The significant correlation structures that are observed evolve smoothly with collision centrality. The major correlation features include a saddle shape plus a broad peak with maximum near

y_{T} \approx 3

, corresponding to

p_{T} \approx 1.5

GeV / c

. The broad peak is observed in both like- and unlike-sign charge combinations and in near- and away-side relative azimuthal angles. The all-charge, all-azimuth correlation measurements are compared with the predictions of hijing and epos to provide theoretical context for these new measurements. The results indicate that the correlations for peripheral to mid-central collisions can be approximately described as a superposition of nucleon

+

nucleon collisions with minimal effects from the quantum chromodynamics medium. Strong medium effects are indicated in mid- to most-central collisions.

25.75.q
25.75.Gz
rapidity: transverse
correlation: two-particle
matter: effect
charged particle: correlation
heavy ion: scattering
nucleon nucleon: scattering
STAR
quantum chromodynamics

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