论文标题
Quarkonia的相干光生孕症中的核效应
Nuclear effects in coherent photoproduction of heavy quarkonia
论文作者
论文摘要
在QCD颜色偶极形式主义中研究了重夸克尼亚对核靶标的相干光生源，包括几种主要现象：i）碰撞$ \ vec b $ \ vec b $的影响参数与偶极取向$ \ vec r $之间的相关性； ii）与$ \ bar qq $ fock the Photon状态相关的高扭力核阴影； iii）对应于含有元素的光子的较高的fock成分的领先的gluon阴影； iv）与计算相比，量子相干性在流行的Balitsky-Kovchegov方程中降低了，这些计算经常在文献中呈现。我们对差异截面的计算与最新的爱丽丝有关超期核碰撞中炭的生产的数据非常吻合。我们还提出了其他Quarkonium状态相干光生产的预测（$ψ^{\，\ prime} $（2s），$υ$（1s）和$υ^{\，\，\ prime} $（2S）），可以通过LHC的未来测量值验证。
Coherent photoproduction of heavy quarkonia on nuclear targets is studied within the QCD color dipole formalism including several main phenomena: i) The correlation between impact parameter of a collision $\vec b$ and dipole orientation $\vec r$; ii) The higher-twist nuclear shadowing related to the $\bar QQ$ Fock state of the photon; iii) The leading-twist gluon shadowing corresponding to higher Fock components of the photon containing gluons; iv) Reduced effects of quantum coherence in a popular Balitsky-Kovchegov equation compared to calculations, which are frequently presented in the literature. Our calculations of differential cross sections are in good agreement with recent ALICE data on charmonium production in ultra-peripheral nuclear collisions. We present also predictions for coherent photoproduction of other quarkonium states ($ψ^{\,\prime}$(2S), $Υ$(1S) and $Υ^{\,\prime}$(2S)) that can be verified by future measurements at the LHC.
