论文标题
相对论重离子和D+AU碰撞中直接光子的几何缩放
Geometrical Scaling of Direct Photons in Relativistic Heavy Ion and d+Au Collisions
论文作者
论文摘要
在本文中，我们表明在不同的中心性类别和不同能量的A+A和D+AU碰撞中直接光子的多样性光谱表现出几何缩放，{\ em I.E.}，它们取决于参与者数量的特定组合，$ n _ {\ rm part} $ w $ w $ w $ w $ w $ w $ w $ w $ - 变量分别。特别是，依赖于$ n _ {\ rm part} $的碰撞几何形状的依赖性与基于颜色玻璃冷凝物理论的期望一致。
In this paper, we show that multiplicity spectra of direct photons in A+A and d+Au collisions at different centrality classes and different energies exhibit geometrical scaling, {\em i.e.}, they depend on a specific combination of number of participants $N_{\rm part}$, collisions energy $W$, and transverse momentum $p_{T}$ -- called saturation scale -- rather than on all these three variables separately. In particular, the dependence on the geometry of collisions encoded in the dependence on $N_{\rm part}$ is in agreement with the expectations based on the Color Glass Condensate theory.
