在$\sqrt{s}=200$和GeV的$\vec{p}+\vec{p}$碰撞中中性π介子和η介子产生的包含双螺旋不对称性
Inclusive double-helicity asymmetries in neutral pion and eta meson production in $\vec{p}+\vec{p}$ collisions at $\sqrt{s}=200$ GeV
摘要：
结果来自2009年在相对论重离子对撞机上的PHENIX实验记录的数据，用于在$\sqrt{s} = 200$ GeV极化$p$ $+$ $p$碰撞中产生$π^0$和$η$的双纵向自旋不对称性$A_{LL}$。比较的$π^0$结果与不同的理论预期的基础上拟合的其他已发表的数据表明，在探测Bjorken $x$范围内的质子的胶子极化，$ΔG$的小正值的偏好。将新的2009年\pz数据添加到最近的偏振散射数据的全球分析的效果也被示出，导致在范围$0.05<x<0.2$中的最佳拟合值$ΔG^{[0.05,0.2]}_{\mbox{DSSV}} = 0.06^{+0.11}_{-0.15}$，当仅考虑统计实验不确定性时，不确定性在$Δχ^2 = 9$。通过系统不确定性移动PHENIX数据点，导致$0.02$和$0.12$之间$ΔG^{[0.05,0.2]}_{\mbox{DSSV}}$的最佳拟合值发生变化，表明需要在未来的全球分析中全面处理实验系统不确定性。
英文摘要：
Results are presented from data recorded in 2009 by the PHENIX experiment at the Relativistic Heavy Ion Collider for the double-longitudinal spin asymmetry, $A_{LL}$, for $π^0$ and $η$ production in $\sqrt{s} = 200$ GeV polarized $p$$+$$p$ collisions. Comparison of the $π^0$ results with different theory expectations based on fits of other published data showed a preference for small positive values of gluon polarization, $ΔG$, in the proton in the probed Bjorken $x$ range. The effect of adding the new 2009 \pz data to a recent global analysis of polarized scattering data is also shown, resulting in a best fit value $ΔG^{[0.05,0.2]}_{\mbox{DSSV}} = 0.06^{+0.11}_{-0.15}$ in the range $0.05<x<0.2$, with the uncertainty at $Δχ^2 = 9$ when considering only statistical experimental uncertainties. Shifting the PHENIX data points by their systematic uncertainty leads to a variation of the best-fit value of $ΔG^{[0.05,0.2]}_{\mbox{DSSV}}$ between $0.02$ and $0.12$, demonstrating the need for full treatment of the experimental systematic uncertainties in future global analyses.
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