Higgs decay into two photons, dispersion relations and trace anomaly

Abstract

We examine the contribution of W boson loops to the amplitude of the process H --> γγwithin the dispersion relation approach, taking up an issue raised in this context recently. We show that the non-vanishing limit of the relevant formfactor for mW --> 0 is due to a finite subtraction induced by the value of the corresponding trace anomaly. The argument can be truned around and one thus arrives at a dispersive ("infrared") derivation of the trace anomaly.

References in corpus (3)

• Two-Photon Decay Widths of Higgs Particles
• Higgs - Two Photon Decay: QCD radiative correction
• RENORMALIZATION and the EQUIVALENCE THEOREM: ON-SHELL SCHEME

Cited by in corpus (5)

• Relativistic corrections to paired production of charmonium and bottomonium in decays of the Higgs boson
• Dispersion theoretic calculation of the $H\to Z+\gamma$ amplitude
• Once more on the W-loop contribution to the Higgs decay into two photons
• Diphoton decay of the higgs from the Epstein--Glaser viewpoint
• The dispersion method and dimensional regularization applied to the decay $H\to Z\gamma$