Probing Magnetic Moment Operators in $H \gamma$ Production and $H \to \tau^+ \tau^- \gamma$ Rare Decay

TL;DR

This paper investigates how magnetic and weak magnetic moment operators influence Higgs-related processes at the LHC, proposing new ways to detect physics beyond the Standard Model that previous experiments couldn't explore.

Contribution

It introduces a novel analysis of magnetic moment operators in Higgs production and decay, highlighting processes that can probe new physics beyond LEP measurements.

Findings

Processes $pp\to H\gamma$ and $gg\to H \to \tau^+ \tau^- \gamma$ can explore untested parameter space.

These processes are sensitive to magnetic moment operators not accessible at LEP.

The study demonstrates potential for future LHC measurements to detect new physics effects.

Abstract

The magnetic moment ($a_\gamma$) and weak magnetic moment ($a_W$) of charged leptons and quarks are sensitive to quantum effects of new physics heavy resonances. In effective field theory $a_\gamma$ and $a_W$ are induced by two independent operators, therefore, one has to measure both the $a_\gamma$ and $a_W$ to shed lights on new physics. The $a_W$'s of the SM fermions are measured at the LEP. In this work, we analyze the contributions from magnetic and weak magnetic moment operators in the processes of $pp\to H \gamma$ and $gg\to H \to \tau^+ \tau^- \gamma$ at the High-Luminosity Large Hadron Collider. We demonstrate that the two processes could cover most of the parameter space that cannot be probed at the LEP.