论文标题
质子热点和独家矢量介子生产
Proton hot spots and exclusive vector meson production
论文作者
论文摘要
我们探讨了质子内gluonic热点存在的后果，以使深度非弹性散射中的连贯和不连贯的独家载体介子生产横截面。通过在颜色玻璃冷凝物框架的稀数极限下工作，以计算波动颜色电荷的高斯热点的横截面，并采用非相关矢量介子波函数，我们能够在分析上进行大部分计算。我们发现相干横截面对目标的大小和探针的结构都敏感。不一致的横截面由小横向动量转移（$ t $）的颜色波动（由质子和热点尺寸）以及探头的结构中的颜色波动（$ t $）主导，并在中等$ t $的情况下，在大$ t $中再次通过颜色波动。虽然横截面的$ t $依赖性在我们的模型中得到了很好的再现，但相干和不一致的横截面之间的相对归一化表明需要在质子中进行额外的波动。
We explore consequences of the existence of gluonic hot spots inside the proton for coherent and incoherent exclusive vector meson production cross sections in deep inelastic scattering. By working in the dilute limit of the Color Glass Condensate framework to compute the cross sections for Gaussian hot spots of fluctuating color charges and employing a non-relativistic vector meson wave function, we are able to perform large parts of the calculation analytically. We find that the coherent cross section is sensitive to both the size of the target and the structure of the probe. The incoherent cross section is dominated by color fluctuations at small transverse momentum transfer ($t$), by proton and hot spot sizes as well as the structure of the probe at medium $t$ and again by color fluctuations at large $t$. While the $t$-dependence of the cross section is well reproduced in our model, the relative normalization between the coherent and the incoherent cross sections points to the need for additional fluctuations in the proton.
