Next-to-leading-order QCD corrections to gluon fragmentation into ^(1)S_(0)^((1.8)) quarkonia  

作　　者：冯锋 贾宇 Feng Feng;Yu Jia(China University of Mining and Technology,Beijing 100083,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;School of Physics,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]China University of Mining and Technology,Beijing 100083,China [2]Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [3]School of Physics,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Chinese Physics C》2023年第3期42-48,共7页中国物理C（英文版）

基　　金：supported by the National Natural Science Foundation of China(12275353 and 11875318);.Y.J.is supported in part by the National Natural Science Foundation of China(11475188);CRC110 by DGF and NSFC(11621131001)。

摘　　要：Within the NRQCD factorization framework,we compute the next-to-leading-order QCD corrections to the gluon fragmentation into the ^(1)S_(0)^((1.8)) Fock components of a quarkonium,at the lowest order in velocity expan-sion.We follow the operator definition of the fragmentation function advanced by Collins and Soper.The key tech-nique underpinning our calculation is the sector decomposition method widely used in the area of multi-loop compu-tation.It is found that the NLO QCD corrections have significant effects,and qualitatively modify the profiles of the corresponding leading-order fragmentation functions.

关 键 词：fragmentation function NRQCD NLO 

分 类 号：O572.33[理学—粒子物理与原子核物理]