论文标题
重Quarkonia在细胞核上的相干光生源
Coherent photoproduction of heavy quarkonia on nuclei
论文作者
论文摘要
在QCD颜色偶极式形式主义中计算了重夸克尼亚在核靶标上相干照相的差分横截面。计算了与光子的$ \ bar Qq $ Fock组件相对应的高扭核阴影，包括偶极取向$ \ vec r $与碰撞$ \ vec B $的影响参数之间的相关性，该参数与横向动量通过傅立叶变换有关。我们还包括对应于含有光子的较高的纤维组件的领先的扭曲阴影，这些胶子具有较短的相干时间，尤其是对于多振子组件，即使在非常高的能量下也是如此。使用路径综合技术计算出这种波动的Gluonic偶极子的贡献。我们的结果与最新的爱丽丝关于超核核冲突中炭的生产的数据非常吻合。
The differential cross section of coherent photo-production of heavy quarkonia on nuclear targets is calculated within the QCD color dipole formalism. The higher-twist nuclear shadowing corresponding to the $\bar QQ$ Fock component of the photon, is calculated including the correlation between dipole orientation $\vec r$ and impact parameter of a collision $\vec b$, which is related to the transverse momentum transfer via Fourier transform. We also included the leading twist gluon shadowing corresponding to higher Fock components of the photon containing gluons, which have specifically short coherence time, especially for multi-gluon components, even at very high energies. The contribution of such fluctuating gluonic dipole is calculated employing the path-integral technique. Our results are in good agreement with recent ALICE data on charmonium production in ultra-peripheral nuclear collisions.
