[NT/RBRC Seminar] Loops in light cone perturbation theory
by
https://bnl.zoomgov.com/j/1611743505?pwd=VTA5b3lkdDJ1UE15VklrNGtUOHdzdz09
Light cone perturbation theory refers to "old-fashioned" perturbation theory (as opposed to the covariant Feynman theory) with a light-like variable taking the role of time. It is the method of choice for perturbative calculations in the high energy limit of QCD, where a simple probe, e.g. a quark or virtual photon, interacts with a nonperturbative color field. This talk concentrates on recent progress in calculating the total deep inelastic scattering cross section in the color dipole picture at next to leading order in perturbation theory. For massless quarks this cross section has been computed and used to describe HERA data. For massive quarks the calculation is close to being complete, with results for a longitudinally polarized photon already published. The calculation for massive quarks poses both technically and conceptually challenging problems related to mass renormalization in light cone perturbation theory.
Yacine Mehtar-Tani