论文标题
中央快速速度的双$ J/ψ$生产中初始Gluon排放的作用
The role of initial gluon emission in double $J/ψ$ production at central rapidities
论文作者
论文摘要
我们考虑在$ k_t $ factorization方法的框架中，在LHC $ pp $碰撞中的双$ j/ψ$生产的过程。我们专注于与初始状态下多个gluon发射有关的gluon碎片机制。根据Catani-Ciafaloni-Fiorani-Marchesini进化方程对初始状态发射进行处理，并适用于单个和双方散射案例。我们展示了碎片贡献对$ j/ψ$配对生产的重要性，并在理论预测与收集到$ \ sqrt {s} = 8 $ tev的最新Atlas数据之间进行比较。我们发现，多个Gluon发射的影响对于单次和倍年的相互作用过程至关重要。最后，我们强调了根据计算的数值稳定性正确选择分解量表以及与非共线进化方程的一致性的问题。
We consider the process of double $J/ψ$ production in $pp$ collisions at the LHC in the framework of $k_T$-factorization approach. We focus on the gluon fragmentation mechanism which is related to multiple gluon emission in the initial state. The initial state emission is treated according to Catani-Ciafaloni-Fiorani-Marchesini evolution equation, and applies to both single and double parton scattering cases. We show the importance of fragmentation contributions to $J/ψ$ pair production and perform a comparison between theoretical predictions and the latest ATLAS data collected at $\sqrt{s} = 8$ TeV. We find that the effects of multiple gluon emission are essential for both single- and multiparton interaction processes. Finally, we highlight the problem of correct choice of the factorization scale with respect to numerical stability of the calculations and the consistency with non-collinear evolution equations.
