The Suppression of Neutralino Annihilation into Zh

Details The Suppression of Neutralino Annihilation into Zh The Suppression of Neutralino Annihilation into Zh

2006-02-13

arxiv.org/abs/hep-ph/0602111v5

Eur.Phys.J.C47:805-814,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 5 figures 10 pages, 5 figures

Scientific paper

10.1140/epjc/s2006-02594-6

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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