With the recent observations of collective behavior of produced particles in small collision systems, measurements of the modification of hadron production in small systems have become increasingly relevant. To study the properties of possible quark-gluon plasma and cold nuclear matter effects PHENIX has performed measurements of light flavor hadrons (π , π ⁰, K ^*0, φ, and ) in a broad set of projectile-target combinations including p+Al, p+Au, d+Au and ³He+Au collisions at = 200 GeV. The obtained invariant transverse momentum spectra and nuclear modification factors are presented and compared to theoretical model predictions where available. The observation of baryon enhancement in the new experimental data and the comparisons with different calculations confirm that quark-gluon plasma could be formed in small collision systems. However, the volume and the lifetime of the medium produced in small collision systems might be insufficient for observation of strangeness enhancement and jet quenching effects.

随着最近对小碰撞系统中产生的粒子的集体行为的观察，对小系统中强子产生变化的测量变得越来越重要。为了研究可能的夸克胶子等离子体和冷核物质效应的特性，PHENIX 对光味强子 ( π , π ⁰ , K ^*0 , φ , and ) 在一系列广泛的射弹-目标组合中，包括p +Al、p +Au、d +Au 和³ He+Au 碰撞= 200 GeV。呈现获得的不变横向动量谱和核修改因子，并在可用的情况下与理论模型预测进行比较。新实验数据中对重子增强的观察以及与不同计算的比较证实了夸克-胶子等离子体可以在小型碰撞系统中形成。然而，在小型碰撞系统中产生的介质的体积和寿命可能不足以观察奇异性增强和射流淬火效应。