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- W4292646884 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.Received 19 November 2021Revised 12 July 2022Accepted 29 July 2022DOI:https://doi.org/10.1103/PhysRevLett.129.092501© 2022 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasHard scatteringParticle correlations & fluctuationsPerturbative QCDNuclear Physics" @default.
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