Identified charged-hadron production in <math><mrow><mi>p</mi><mo>+</mo><mi>Al</mi></mrow></math>, <math><mrow><mmultiscripts><mi>He</mi><mprescripts/><none/><mn>3</mn></mmultiscripts><mo>+</mo><mi>Au</mi></mrow></math>, and <math><mrow><mi>Cu</mi><mo>+</mo><mi>Au</mi></mrow></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><mspace width="0.16em"/><mi>GeV</mi></mrow></math> and in <math><mrow><mi mathvariant="normal">U</mi><mo>+</mo><mi mathvariant="normal">U</mi></mrow></math> collisions at <math><mrow><msqrt><msub><mi>s</mi><mrow><mi>N</mi><mi>N</mi></mrow></msub></msqrt><mo>=</mo><mn>193</mn><mspace width="0.16em"/><mi>GeV</mi></mrow></math>

Abdulameer, N.J.; Acharya, U.; Adare, A.; Aidala, C.; Ajitanand, N.N.; Akiba, Y.; Akimoto, R.; Alexander, J.; Alfred, M.; Andrieux, V.

doi:10.1103/PhysRevC.109.054910

Identified charged-hadron production in $p + Al$ , ${}^{3}{He} + Au$ , and $Cu + Au$ collisions at $\sqrt{s_{N N}} = 200 GeV$ and in $U + U$ collisions at $\sqrt{s_{N N}} = 193 GeV$

PHENIX

Collaboration

•

N.J. Abdulameer
(
- Debrecen U.
)

Dec 14, 2023

18 pages

Published in:

Phys.Rev.C 109 (2024) 5, 054910

Published: May 20, 2024

e-Print:

2312.09827 [nucl-ex]

DOI:

10.1103/PhysRevC.109.054910 (publication)

Experiments:

BNL-RHIC-PHENIX

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Abstract: (APS)

The PHENIX experiment has performed a systematic study of identified charged-hadron

(π^{\pm},

K^{\pm},

p,

\bar{p})

production at midrapidity in

p + Al

,

{}^{3}{He} + Au

, and

Cu + Au

collisions at

\sqrt{s_{_{N N}}} = 200 GeV

and

U + U

collisions at

\sqrt{s_{_{N N}}} = 193 GeV

. Identified charged-hadron invariant transverse-momentum

(p_{T})

and transverse-mass

(m_{T})

spectra are presented and interpreted in terms of radially expanding thermalized systems. The particle ratios of

K / π

and

p / π

have been measured in different centrality ranges of large (

Cu + Au

and

U + U

) and small (

p + Al

and

{}^{3}{He} + Au

) collision systems. The values of

K / π

ratios measured in all considered collision systems were found to be consistent with those measured in

p + p

collisions. However, the values of

p / π

ratios measured in large collision systems reach the values of

\approx 0.6

, which is a factor of

\approx 2

larger than in

p + p

collisions. These results can be qualitatively understood in terms of the baryon enhancement expected from hadronization by recombination. Identified charged-hadron nuclear-modification factors (

R_{A B}

) are also presented. Enhancement of proton

R_{A B}

values over meson

R_{A B}

values was observed in central

{}^{3}{He} + Au

,

Cu + Au

, and

U + U

collisions. The proton

R_{A B}

values measured in the

p + Al

collision system were found to be consistent with

R_{A B}

values of

ϕ

,

π^{\pm}

,

K^{\pm}

, and

π^{0}

mesons, which may indicate that the size of the system produced in

p + Al

collisions is too small for recombination to cause a noticeable increase in proton production.

Note:

480 authors from 78 institutions, 18 pages, 6 tables, 16 figures. v2 is version accepted for publication in Physical Review C. HEPdata tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html