J/ψ pair hadroproduction at next-to-leading order in nonrelativistic-QCD at CMS  

作　　者：孙立平 Li-Ping Sun(School of Science,Beijing University of Civil Engineering and Architecture,Beijing 102616,China)

机构地区：[1]School of Science,Beijing University of Civil Engineering and Architecture,Beijing 102616,China

出　　处：《Chinese Physics C》2023年第9期69-72,共4页中国物理C（英文版）

基　　金：Supported by the National Natural Science Foundation of China(11905006)。

摘　　要：We perform a complete study of J/ψ pair hadroproduction at next-to-leading order (NLO) in the nonrelativstic-QCD (NRQCD) framework with the cc¯ pair either in the ^(3)S_(1)^([1]) or ^(1)S_(0)^([8]) fock states. It is found that the ^(1)S_(0)^([8]) channel contribution at NLO is essential. Our results indicate that for the CMS, the NRQCD predictions cannot describe the experimental data at all, and the total cross section predicted via NRQCD is smaller than the experimental data by an order of magnitude. Therefore, new mechanisms are needed to understand the CMS data for J/ψ pair production.

关 键 词：NRQCD next-to-leading order CMS fock state 

分 类 号：O572.243[理学—粒子物理与原子核物理]