Extraction of gluon distributions from structure functions at small x in holographic QCD

Physics Letters B

Mei Huang¹  Takahiro Sawada²  Akira Watanabe³ 

[1] Corresponding author.;School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China;Institute of High Energy Physics and Theoretical Physics Center for Science Facilities, Chinese Academy of Sciences, Beijing 100049, People's Republic of China;

关键词: Parton distribution functions;    Gauge/string correspondence;    AdS/CFT correspondence;    Pomeron;   

DOI  :  

来源: DOAJ

【 摘 要 】

We investigate the nucleon and pion gluon distribution functions in the framework of holographic QCD, focusing on the small Bjorken x region. Based on an approximate relation, the gluon distributions are extracted from structure functions of the unpolarized deep inelastic scattering which can be calculated with a holographic QCD model, assuming the Pomeron exchange. All the adjustable parameters of the model are determined with the HERA data of the proton structure functions. We explicitly show that the extracted proton gluon distribution is consistent with results of the recent global QCD analysis. The structure functions of the pion can be computed without any additional parameter, which enables us to predict its gluon distribution also. We find that the resulting pion gluon density is smaller than the proton's, and agrees with the recent global QCD analysis result within the uncertainties.

【 授权许可】

Unknown