One-loop form factors for H→ γ^*γ^* in R_ξ gauge

2021/03/18 by Phan, Khiem Hong, Tran, Dzung Tri
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2103.10045

Abstract

In this paper, we present general one-loop form factors for H→ γ^* γ^* in R_ξ gauge, considering all cases of two on-shell, one on-shell and two off-shell for final photons. The calculations are performed in standard model and in arbitrary beyond the standard models which charged scalar particles may be exchanged in one-loop diagrams. Analytic results for the form factors are shown in general forms which are expressed in terms of the Passarino-Veltman functions. We also confirm the results in previous computations which are available for the case of two on-shell photons. The ξ-independent of the result is also discussed. We find that numerical results are good stability with varying ξ=0,1 and ξ→ ∞.

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