Probing Charged Matter Through Higgs Diphoton Decay, Gamma Ray Lines, and EDMs

TL;DR

This paper investigates how new charged particles at the weak scale could produce detectable signals across collider, astrophysical, and underground experiments, linking Higgs decay, gamma-ray lines, and EDMs through loop effects.

Contribution

It analyzes the interplay of signals from charged particles in various experiments, highlighting potential coincident detections across multiple measurement methods.

Findings

Loop effects relate Higgs diphoton decay and dark matter signals.

Current experiments are sensitive to charged particles at similar mass ranges.

Multiple experimental signals could simultaneously indicate new charged particles.

Abstract

Numerous experiments currently underway offer the potential to indirectly probe new charged particles with masses at the weak scale. For example, the tentative excess in Higgs diphoton decay and the tentative gamma-ray line in Fermi-LAT data have recently attracted attention as possible one-loop signatures of new charged particles. We explore the interplay between such signals, dark matter direct detection through Higgs exchange, and measurements of the electron EDM, by studying the size of these effects in several models. We compute one-loop effects to explore the relationship among couplings probed by different experiments. In particular, models in which dark matter and the Higgs both interact with charged particles at a detectable level typically induce, at loop level, couplings between dark matter and the Higgs that are around the level of current direct detection sensitivity. Intriguingly, one-loop Higgs diphoton decay and DM annihilation into two photons, two-loop EDMs, and loop-induced direct detection rates are all coming within range of existing experiments for approximately the same range of charged particle masses, offering the prospect of an exciting coincidence of signals at collider, astrophysical, underground and atomic physics measurements.