One-loop calculations for $H\rightarrow f\bar{f}\gamma$ in the $U(1)_{B-L}$ extension for Standard Model

TL;DR

This paper calculates one-loop decay form factors for the process $H\rightarrow f\bar{f}\gamma$ within a $U(1)_{B-L}$ extended Standard Model, highlighting potential observable effects at future colliders.

Contribution

It provides analytic one-loop form factors expressed with Passarino-Veltman functions for the $U(1)_{B-L}$ extension, enabling numerical decay rate evaluations with LoopTools.

Findings

The $U(1)_{B-L}$ extension affects decay rates measurably.

Differential decay rates depend on $m_{ff}$, $M_{Z'}$, and $g'$.

Effects are significant for future collider experiments.

Abstract

In this paper, we present the calculations for $H\rightarrow f\bar{f}\gamma$ in the $U(1)_{B-L}$ extension for Standard Model. Analytic results for one-loop form factors in the decay process are expressed in terms of the scalar one-loop Passarino$-$Veltman functions in the conventions of {\tt LoopTools}. Therefore, the decay rates can be evaluated numerically by using this package. In phenomenological results, we show the differential decay rates with respect to invariant mass of fermion pair $m_{ff}$, new neutral gauge mass $M_{Z'}$ and the coupling $g'$ of $U(1)_{B-L}$ gauge group. We find that the contributions of the $U(1)_{B-L}$ extension for Standard Model are visible effects and they must be taken into account at future colliders.