Relativistic correction to gluon fragmentation function into pseudoscalar quarkonium  

作　　者：高祥瑞 贾宇 李留记 熊小努 

机构地区：[1]Institute of High Energy Physics and Theoretical Physics Center for Science Facilities,Chinese Academy of Sciences [2]Center for High Energy Physics, Peking University [3]Istituto Nazionale di Fisica Nucleare, Sezione di Pavia

出　　处：《Chinese Physics C》2017年第2期55-63,共9页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(11475188,11261130311,11575202,11222549);IHEP Innovation(Y4545170Y2);State Key Lab for Electronics and Particle Detectors

摘　　要：Inspired by the recent measurements of the ηc meson production at LHC experiments, we investigate the relativistic correction effect for the fragmentation functions of gluon/charm quark fragmenting into ηc, which constitute the crucial nonperturbative element for the ηc production at high pT. Employing three distinct methods,we calculate the next-to-leading-order（NLO） relativistic correction to g →ηc fragmentation function in the NRQCD factorization framework, as well as verifying the existing NLO result for the c →ηc fragmentation function. We also study the evolution behavior of these fragmentation functions with the aid of the DGLAP equation.Inspired by the recent measurements of the ηc meson production at LHC experiments, we investigate the relativistic correction effect for the fragmentation functions of gluon/charm quark fragmenting into ηc, which constitute the crucial nonperturbative element for the ηc production at high pT. Employing three distinct methods,we calculate the next-to-leading-order（NLO） relativistic correction to g →ηc fragmentation function in the NRQCD factorization framework, as well as verifying the existing NLO result for the c →ηc fragmentation function. We also study the evolution behavior of these fragmentation functions with the aid of the DGLAP equation.

关 键 词：QCD heavy quarkonium fragmentation function DGLAP equation 

分 类 号：O572.33[理学—粒子物理与原子核物理]