Evidence for Nonlinear Gluon Effects in QCD and Their Mass Number Dependence at STAR

(STAR Collaboration)

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The STAR Collaboration reports measurements of back-to-back azimuthal correlations of di-π0s 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 π0 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 Qs2 on the mass number A. A linear scaling of the suppression with A1/3 is observed with a slope of -0.09±0.01.

Original languageEnglish (US)
Article number092501
JournalPhysical Review Letters
Volume129
Issue number9
DOIs
StatePublished - Aug 26 2022
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Fingerprint

Dive into the research topics of 'Evidence for Nonlinear Gluon Effects in QCD and Their Mass Number Dependence at STAR'. Together they form a unique fingerprint.

Cite this