Factorization Violation and Scale Invariance

Understand

Factorization violating effects in hadron scattering are due mainly to spectator-spectator interactions.

• While it is known that these interactions cancel in inclusive cross sections, like for the Drell-Yan process, not much is known about for what classes of observables factorization is violated.
• We show that for pure Glauber ladder graphs, all amplitude-level factorization violating effects completely cancel at cross section level for any single-scale observable (such as hadronic transverse energy or beam thrust).
• This result disproves previous claims that these pure Glauber graphs are factorization-violating.