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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 $m_{Z}/m_{\chi}$.
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Contributor : Jeanine Pellet <>
Submitted on : Wednesday, February 15, 2006 - 5:30:19 PM
Last modification on : Thursday, January 11, 2018 - 6:14:02 AM

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B. Labonne, E. Nezri, Jean Orloff. The Suppression of Neutralino Annihilation into Zh. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2006, 47, pp.805-814. ⟨10.1140/epjc/s2006-02594-6⟩. ⟨in2p3-00025633⟩



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