Photon structure function in supersymmetric QCD revisited

Abstract

We investigate the virtual photon structure function in the supersymmetric QCD (SQCD), where we have squarks and gluinos in addition to the quarks and gluons. Taking into account the heavy particle mass effects to the leading order in QCD and SQCD we evaluate the photon structure function and numerically study its behavior for the QCD and SQCD cases.

Photon structure functions with heavy particle mass effects

“…There we have also taken into account the threshold effects 0 ≤ x ≤ x max with x max = 1/(1 + P 2 /Q 2 + 4m 2 /Q 2 ). Figure 5: Photon structure function F γ 2 (x, Q 2 , P 2 )/α in supersymmetric QCD where heavy particle mass effects are taken into account [18] We note that at small x there is no significant differ-ence between massless and massive QCD, while there exists a large difference between massless and massive SQCD. At large x, the significant mass-effects exist both for non-SUSY and SUSY QCD.…”

Photon structure functions at the ILC energy range

“…This would be possible using polarized electron and positron beams in the future linear collider. Furthermore, two-photon processes are a background for physical analyses in which signals from the so-called new physics are being searched for, and their evaluation will be important to obtain reliable results [17].…”