The polarized photon structure function g1γ(x,Q2) in massive parton model in NLO

Norihisa Watanabe, Yuichiro Kiyo, Ken Sasaki
2012 Physics Letters B  
We investigate the one-gluon-exchange (αα_s) corrections to the polarized real photon structure function g_1^γ(x,Q^2) in the massive parton model. We employ a technique based on the Cutkosky rules and the reduction of Feynman integrals to master integrals. The NLO contribution is noticeable at large x and does not vanish at the threshold of the massive quark pair production due to the Coulomb singularity. It is found that the first moment sum rule of g_1^γ is satisfied up to the NLO.
doi:10.1016/j.physletb.2011.12.036 fatcat:cmedbqoxybd4bep2wp7w3aowca