Higgs decay into two photons, dispersion relations and trace anomaly

Details Higgs decay into two photons, dispersion relations and trace anomaly Higgs decay into two photons, dispersion relations and trace anomaly

1996-03-15

arxiv.org/abs/hep-ph/9603320v1

Phys.Lett. B379 (1996) 159-162

Physics

High Energy Physics

High Energy Physics - Phenomenology

Scientific paper

10.1016/0370-2693(96)00432-7

We examine the contribution of W boson loops to the amplitude of the process H --> \gamma \gamma within 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.

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