Pion parton distribution function in light-front holographic QCD  

作　　者：Lei Chang Khépani Raya Xiaobin Wang 常雷;Khépani Raya;王晓斌(School of Physics,Nankai University,Tianjin 300071,China)

机构地区：[1]School of Physics,Nankai University,Tianjin 300071,China

出　　处：《Chinese Physics C》2020年第11期163-167,共5页中国物理C（英文版）

基　　金：Supported by the Chinese Government Thousand Talents Plan for Young Professionals。

摘　　要：The valence-quark distribution function of the pion has been of interest for decades;particularly,the profile it should adopt when x→1(the large-x behavior)has been the subject of a long-standing debate.In the light-front holographic QCD(LFHQCD)approach,this behavior is controlled by the so-called reparametrization function,wτ(x),which is not fully determined from first principles.We show that,owing to the flexibility of wτ(x),the large-x profile u^π(x)∼(1−x)^2 can be contained within the LFHQCD formalism.This is in contrast to a previous LFHQCD study(Guy F.de Teramond et al.,Phys.Rev.Lett.,120(18),2018)in which u^π(x)∼(1−x)^1 was found instead.Given our observations,augmented by perturbative QCD and recent lattice QCD results,we state that the large-x exponent of“2”cannot be excluded.

关 键 词：PION parton distribution function QCD 

分 类 号：O572.33[理学—粒子物理与原子核物理]