Precise yield of high-energy photons from Higgsino dark matter annihilation

TL;DR

This paper provides the most precise theoretical prediction to date for high-energy gamma-ray yields from Higgsino dark matter annihilation, incorporating advanced resummation techniques and analyzing power corrections.

Contribution

It extends electroweak Sudakov resummation to Higgsino dark matter, achieving NLL' accuracy for gamma-ray spectrum predictions and discussing power correction effects.

Findings

Most accurate prediction for gamma-ray yield from Higgsino annihilation

Resummation accuracy achieved at NLL' level for relevant energy resolutions

Power corrections in $m_W/m_\chi$ are not significant

Abstract

The impact of electroweak Sudakov logarithms on the endpoint of the photon spectrum for wino dark matter annihilation was studied intensively over the last several years. In this work, we extend these results to Higgsino dark matter $\chi_1^0$. We achieve NLL' resummation accuracy for narrow and intermediate spectral energy resolutions, of order $m_W^2 / m_\chi$ and $m_W$, respectively. This is the most accurate prediction to date for the yield of high-energy $\gamma$-rays from $\chi_1^0 \chi_1^0 \to \gamma + X$ annihilation for the energy resolutions realized by current and next-generation telescopes. We also discuss for the first time the effect of power corrections in $m_W/m_\chi$ in this context and argue why they are not sizeable.