The Suppression of Neutralino Annihilation into Zh

Abstract

The Indirect Detection of neutralino Dark Matter is most promising through annihilation channels producing a hard energy spectrum for the detected particles, such as the neutralino annihilation into $Zh$. A cancellation however makes this particular annihilation channel generically subdominant in the huge parameter space of supersymmetric models. This cancellation requires non-trivial relations between neutralino mixings and masses, which we derive from gauge independence and unitarity of the MSSM. To show how the cancellation overshoots leaving only a subdominant result, we use a perturbative expansion in powers of the electroweak/supersymmetry breaking ratio $m_Z/m_{\chi }$.

arXiv comment10 pages, 5 figures 10 pages, 5 figures

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Cited by in corpus (3)

• High energy neutrinos from neutralino annihilations in the Sun
• Supersymmetric superheavy dark matter
• Gamma ray and Neutrino fluxes from a cosmological dark matter simulation