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Neutralino Annihilation into Two Photons

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arxiv hep-ph/9706538 v1 pith:AKY4ETJC submitted 1997-06-30 hep-ph astro-ph

classification hep-phastro-ph
keywords annihilationgaugeneutralinophotonsbackground-fieldbergstromcalculationscompute
verification ladder T0 review T1 audit T2 compute T3 formal

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We compute the annihilation cross-section of two neutralinos at rest into two photons, which is of importance for the indirect detection of neutralino dark matter in the galactic halo through a quasi-monochromatic gamma-ray line. We include all diagrams to one-loop level in the minimal supersymmetric extension of the standard model. We use the helicity formalism, the background-field gauge, and an efficient loop-integral reduction method. We confirm the result recently obtained by Bergstrom and Ullio in a different gauge, which disagrees with other published calculations.

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  1. Non-factorizable Superamplitudes for Massive N = 1 Superstates

    hep-th 2025-05 conditional novelty 6.0 of 10

    Massive N=1 superamplitudes for chiral multiplets have the universal non-factorizable form δ^(2)(Q†) Q^2 ∏(1 - 1/2 η_i^2), with form factors built from Q and Q† insertions.

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