Reduction Schemes in Cutoff Regularization and Higgs Decay into Two Photons

Abstract

We present a new systematic method to evaluate one-loop tensor integrals in conventional ultraviolet cutoff regularization. By deriving a new recursive relation that describes the momentum translation variance of ultraviolet integrals, we implement this relation in the Passarino-Veltman reduction method. With this method, we recalculated the Higgs boson decay into two photons process at one-loop level in the Standard Model. We reanalyze this process carefully and clarify some issues arisen recently in cutoff regularization.

Comments: Version published in JHEP, 21 pages, 3 figures, Title changed and contents reorganized, result not changed