Matching resummed endpoint and continuum $\gamma$-ray spectra from dark-matter annihilation

Kai Urban; Martin Beneke; Martin Vollmann

Matching resummed endpoint and continuum $\gamma$-ray spectra from dark-matter annihilation

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arxiv 2203.01692 v1 pith:3EIHW4RI submitted 2022-03-03 hep-ph astro-ph.HE

Martin Beneke , Kai Urban , Martin Vollmann This is my paper · ORCID

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keywords electroweakgammaannihilationdark-matterenergyresummationspectraaccounting

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abstract

For the minimal wino and Higgsino benchmark models we provide accurate energy spectra of high-energy photons from TeV scale dark-matter annihilation $\chi\chi\to \gamma+X$ by merging electroweak Sudakov resummation near maximal energy with the electroweak parton-shower PPPC4DM, and accounting for the Sommerfeld effect. Electroweak resummation significantly changes the shape of the photon-energy spectrum in the wide range $E_\gamma \sim (0.6\ldots 1)\, m_\chi$ and hence the form of the so-called "line-signal".

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