论文标题
赫拉领先的中子事件中的几何缩放
Geometric scaling in leading neutron events at HERA
论文作者
论文摘要
该分析提供了GBW模型的新拟合，以及在一个旋转交换近似中，与领先的中子结构函数HEA数据HEA数据相关参数依赖性饱和模型（BSAT或IP-SAT）。偶极子横截面的两个参数化提供了对所考虑数据的良好描述。这里首次显示实验性领先的中子生产HERA数据显示几何缩放，在这种情况下，这意味着总$γ^*π^* $横截面仅是一个无尺寸变量$τ= q^2/q_s^2（x）$的函数。几何缩放区域扩展到$ q^2 $的广泛范围，并且可以归因于饱和边界的存在，该边界表现为$ q^2 \ geq q^2_s $。领先的中子事件中的缩放行为与包容性dis事件的观察到非常相似。
This analysis provides new fits of the GBW model and the impact parameter-dependent saturation model (bSat or IP-Sat) to the leading neutron structure function HERA data in one pion exchange approximation. Both parametrizations of the dipole cross section provide good descriptions of the considered data. It is shown here for the first time that the experimental leading neutron production HERA data exhibits geometric scaling, which in this context means that the total $γ^* π^*$ cross section is a function of only one dimensionless variable $τ= Q^2/Q_s^2(x)$. The geometric scaling region extends over a broad range of $Q^2$ and can be attributed to the presence of a saturation boundary which manifests at $Q^2\geq Q^2_s$. The scaling behaviour in leading neutron events is profoundly similar to what has been observed for the inclusive DIS events.
