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

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.

30 pages, 5 figures, v2: matches published version + typo in (C.23) fixed

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• Relic density of dark matter in the inert doublet model beyond leading order for the low mass region: 1. Renormalisation and constraints
• Dark Matter Line Searches with the Cherenkov Telescope Array
• TeV Dark Matter Searches in the Extragalactic Gamma-Ray Sky
• Electroweak resummation of neutralino dark-matter annihilation into high-energy photons
• NLO electroweak potentials for minimal dark matter and beyond
• Search for gamma-ray spectral lines from dark matter annihilation with the H.E.S.S. Inner Galaxy Survey