Relating Hard QCD Processes Through Universality of Mass Singularities

摘要: Abstract Extending previous techniques we obtain at all orders the factorization of mass singularities for every hard QCD process. These appear in a universal factor that can be reabsorbed into standard parton density. Thus suitable ratios cross sections computed by perturbative expansion running coupling constant. Moreover, leading log level obtain, after explicit cancellation infrared divergences, scaling violation operator product expansion.