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American University of Cairo, New Cairo 11835, New Cairo, Egypt.
Texas A&M University, College Station, Texas 77843.
Phys Rev Lett. 2022 Aug 26;129(9):092501. doi: 10.1103/PhysRevLett.129.092501.
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.
STAR合作组报告了在质心能量为200 GeV的质子-质子（p+p）、质子-铝（p+Al）和质子-金（p+Au）碰撞中，前向赝快度（2.6＜η＜4.0）下产生的双π⁰背对背方位角关联的测量结果。我们观察到，与p+p数据相比，p+Al和p+Au碰撞中背对背π⁰对的关联产额明显受到抑制。观察到的背对背粒子对的抑制作为横向动量的函数表明，在高部分子密度下出现了非线性胶子动力学。相对于p+Al碰撞，在p+Au碰撞中发现的更大抑制表现出饱和标度Q_s²对质量数A的依赖性。观察到抑制与A¹/³呈线性标度关系，斜率为-0.09±0.01。
