arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1804.06110hep-phnucl-th
收藏

质子的衍射非相干矢量介子产生:胶子涨落效应的夸克模型方法

Diffractive incoherent vector meson production off protons: a quark model approach to gluon fluctuation effects

Marco Claudio Traini, Jean-Paul Blaizot

摘要:

涨落在矢量介子的衍射产生中起着重要的作用。特别是最近提出,基于影响参数依赖的饱和模型(IPSat),质子内的组成夸克的运动引发的几何波动可以解释在HERA观察到的非相干衍射过程。我们提出了一个变体的IPSat模型,其中包括组成夸克之间的空间和对称性相关性,从而减少了描述衍射矢量介子生产所需的参数的数量到一个单一的,每个价夸克周围的胶子云的大小。应用于$J/Ψ$、$ρ$和$ϕ$衍射电子和光子产生截面揭示了几何涨落在非相干通道中的重要作用,而其他涨落源则需要充分考虑轻介子的电产生,以及小动量转移时$J/Ψ$介子的光产生。

英文摘要:

Fluctuations play an important role in diffractive production of vector mesons. It was in particular recently suggested, based on the Impact-Parameter dependent Saturation model (IPSat), that geometrical fluctuations triggered by the motion of the constituent quarks within the protons could explain incoherent diffractive processes observed at HERA. We propose a variant of the IPSat model which includes spatial and symmetry correlations between constituent quarks, thereby reducing the number of parameters needed to describe diffractive vector meson production to a single one, the size of the gluon cloud around each valence quark. The application to $J/Ψ$, $ρ$ and $ϕ$ diffractive electron and photon production cross sections reveal the important role of geometrical fluctuations in incoherent channels, while other sources of fluctuations are needed to fully account for electroproduction of light mesons, as well as photo production of $J/Ψ$ mesons at small momentum transfer.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑