标题： F_2在低x处的观察 显示英文标题

标题： An Observation on F_2 at Low x

摘要： HERA的H1和ZEUS数据在x和Q^2范围分别为10^{-4} - 5.10^{-2}和5 - 250 GeV^2的情况下，给出了一个简单的参数化方法。 这个经验表达式基于在e+e-碰撞中，平均带电粒子多重性<n>对质心系能量sqrt{s}的明显相似依赖关系，以及在小x下测得的质子结构函数F_2的x依赖关系。 据我们所知，这种相似性之前尚未被注意到。 显示英文摘要

摘要： A simple parametrisation of H1 and ZEUS data at HERA is given for the ranges in x and Q^2 of 10^{-4} - 5.10^{-2} and 5 - 250 GeV^2, respectively. This empirical expression is based on a strikingly similar dependence of the average charged particle multiplicity <n> on the centre of mass system energy sqrt{s} in e+e- collisions on the one hand, and the x dependence of the proton structure function F_2 as measured at small x on the other hand. To the best of our knowledge, this similarity has not been noted before.