Evidence for Nonlinear Gluon Effects in QCD and Their Mass Number Dependence at STAR.
Journal
Physical review letters
ISSN: 1079-7114
Titre abrégé: Phys Rev Lett
Pays: United States
ID NLM: 0401141
Informations de publication
Date de publication:
26 Aug 2022
26 Aug 2022
Historique:
received:
19
11
2021
revised:
12
07
2022
accepted:
29
07
2022
entrez:
9
9
2022
pubmed:
10
9
2022
medline:
10
9
2022
Statut:
ppublish
Résumé
The STAR Collaboration reports measurements of back-to-back azimuthal correlations of di-π^{0}s produced at forward pseudorapidities (2.6<η<4.0) in p+p, p+Al, and p+Au collisions at a center-of-mass energy of 200 GeV. We observe a clear suppression of the correlated yields of back-to-back π^{0} pairs in p+Al and p+Au collisions compared to the p+p data. The observed suppression of back-to-back pairs as a function of transverse momentum suggests nonlinear gluon dynamics arising at high parton densities. The larger suppression found in p+Au relative to p+Al collisions exhibits a dependence of the saturation scale Q_{s}^{2} on the mass number A. A linear scaling of the suppression with A^{1/3} is observed with a slope of -0.09±0.01.
Identifiants
pubmed: 36083674
doi: 10.1103/PhysRevLett.129.092501
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM