标题： 衍射深度非弹性散射 显示英文标题

标题： Diffractive Deep-Inelastic Scattering

摘要： New results on diffractive deep-inelastic $e p$ scattering at HERA are presented using data taken in 1994 with the H1 detector. The cross section for diffractive deep-inelastic scattering is measured in terms of a diffractive structure function $F_2^{D(3)}(\beta,Q^2,\xpom)$ over an extended kinematic range. The dependence of $F_2^{D(3)}$ on $\xpom$ is found not to depend on $Q^2$, but to depend on $\beta$. Therefore the $\xpom$ dependence no longer factorizes. 在对$\xpom$的依赖性积分后，分析了$F_2^{D(3)}$对$Q^2$和$\beta$的依赖性。 对于固定的$\beta$，观察到随着$\log Q^2$的增加有明显的上升趋势，并持续到$\beta$的高值。 根据 Altarelli-Parisi (DGLAP) QCD 进化方程，这些尺度破缺给出了胶子主导过程的明确指示。 随后尝试使用 DGLAP 进化来量化衍射交换的粒子组成内容。 在初始标度下发现了一个“主导”的胶子分布，它贡献了大约$80 \%$在衍射交换中的动量。 对强子末态的测量（能量流和$D^{*}$介子的产生）被发现与深击穿电子-庞加莱散射模型的预测一致，所使用的部分子内容信息已经获得。 显示英文摘要

摘要： New results on diffractive deep-inelastic $e p$ scattering at HERA are presented using data taken in 1994 with the H1 detector. The cross section for diffractive deep-inelastic scattering is measured in terms of a diffractive structure function $F_2^{D(3)}(\beta,Q^2,\xpom)$ over an extended kinematic range. The dependence of $F_2^{D(3)}$ on $\xpom$ is found not to depend on $Q^2$, but to depend on $\beta$. Therefore the $\xpom$ dependence no longer factorizes. The $Q^2$ and $\beta$ dependence of $F_2^{D(3)}$ is analyzed after an integration over the dependence on $\xpom$. For fixed $\beta$ a clear rise with $\log Q^2$ is observed, persisting up to high values of $\beta$. In terms of the Altarelli-Parisi (DGLAP) QCD evolution equations, these scaling violations give clear indications for a gluon dominated process. Subsequently an attempt is made to quantify the parton content of the diffractive exchange using the DGLAP evolution. At the starting scale a ``leading'' gluon distribution is found which contributes about $80 \%$ of the momentum in the diffractive exchange. Measurements of the hadronic final state (energy flow and production of $D^{*}$ mesons) are found to be consistent with the predictions of a model of deep-inelastic electron pomeron scattering using the information on the parton content obtained.