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arXiv 2008.12089hep-ph
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重新审视LHC的$J/ψ$对生产

Revisiting the production of $J/ψ$ pairs at the LHC

A. A. Prokhorov, A. V. Lipatov, M. A. Malyshev, S. P. Baranov

摘要:

在$k_T$ -因子化QCD方法框架下,我们研究了LHC上$pp$碰撞中的双$J/ψ$瞬发产生.使用碎裂机制,我们评估的颜色八隅体的贡献的生产截面考虑到在初始状态下的Ciafaloni-Catani-Fiorani-Marchesini演化方程驱动的多胶子辐射的组合效应。我们证明了这些贡献的重要性,在一定的运动学区域所涵盖的CMS和ATLAS测量。另一方面,LHCb合作组在前向快度和中等横动量下的实验数据可以用${\cal O}(α_s^4)$色单重项和部分子散射机制的贡献很好地描述。有效截面$σ_{\rm eff} = 17.5 \pm 4.1$ ~mb的提取值与基于不同最终状态的许多其他估计兼容。

英文摘要:

We consider the prompt double $J/ψ$ production in $pp$ collisions at the LHC in the framework of $k_T$-factorization QCD approach. Using the fragmentation mechanism, we evaluate the color octet contributions to the production cross sections taking into account the combinatorial effects of multiple gluon radiation in the initial state driven by the Ciafaloni-Catani-Fiorani-Marchesini evolution equation. We demonstrate the importance of these contributions in a certain kinematical region covered by the CMS and ATLAS measurements. On the other hand, the experimental data taken by the LHCb Collaboration at forward rapidities and moderate transverse momenta can be described well by ${\cal O}(α_s^4)$ color singlet terms and contributions from the double parton scattering mechanism. The extracted value of the effective cross section $σ_{\rm eff} = 17.5 \pm 4.1$~mb is compatible with many other estimations based on different final states.

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