论文标题
在$ \ sqrt {s} = 510 $ gev中，极化$ p+p $ collisions中非常向前中性扳手产生的横向单旋旋转不对称性
Transverse single-spin asymmetry for very forward neutral pion production in polarized $p+p$ collisions at $\sqrt{s} = 510$ GeV
论文作者
论文摘要
极化$ p + p $碰撞产生的非常正向中和的横向单旋不对称，使我们能够从扰动和非扰动强相互作用方面理解生产机制。在2017年期间，RHICF合作在相对论重型离子对撞机（RHIC）的星形检测器的零度区域安装了电磁量热，并测量了以$ \ \ sqrt $ \ sqrt {s sqrt {s} $ = 510 gev的伪造$ p $ p $ collisions以高度偏振$ p $ p $ collisions产生的中性尖酸。在纵向动量分数$ x_ {f} $和横向动量$ p_ {t} $中，大型非零的不对称均在低横向动量$ p_ {t} <1 $ gev/$ gev/$ c $中观察到。不对称显示在$ p_ {t} $区域中的大约$ x_ {f} $缩放，其中预期非扰动过程将占主导地位。可能需要从软过程中做出不可忽略的贡献，以解释非零中性锥形不对称。
Transverse single-spin asymmetries of very forward neutral pions generated in polarized $p + p$ collisions allow us to understand the production mechanism in terms of perturbative and non-perturbative strong interactions. During 2017 the RHICf Collaboration installed an electromagnetic calorimeter in the zero-degree region of the STAR detector at the Relativistic Heavy Ion Collider (RHIC) and measured neutral pions produced at pseudorapidity larger than 6 in polarized $p$+$p$ collisions at $\sqrt{s}$ = 510 GeV. The large non-zero asymmetries increasing both in longitudinal momentum fraction $x_{F}$ and transverse momentum $p_{T}$ have been observed at low transverse momentum $p_{T} < 1$ GeV/$c$ for the first time at this collision energy. The asymmetries show an approximate $x_{F}$ scaling in the $p_{T}$ region where non-perturbative processes are expected to dominate. A non-negligible contribution from soft processes may be necessary to explain the nonzero neutral pion asymmetries.
