PAMELA and FERMI limits on the neutralino-chargino mass degeneracy
- LAPTh, U. de Savoie, CNRS, BP 110, Annecy-le-Vieux F-74941 (France)
- Institute for Particle Physics Phenomenology, University of Durham, Durham, DH1 3LE (United Kingdom)
- CERN Theory Division, CH-1211 Genève (Switzerland)
- Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow 119992 (Russian Federation)
Searches for Dark Matter (DM) particles with indirect detection techniques have reached important milestones with the precise measurements of the anti-proton ( p-bar ) and gamma-ray spectra, notably by the PAMELA and FERMI-LAT experiments. While the γ-ray results have been used to test the thermal Dark Matter hypothesis and constrain the Dark Matter annihilation cross section into Standard Model (SM) particles, the anti-proton flux measured by the PAMELA experiment remains relatively unexploited. Here we show that the latter can be used to set a constraint on the neutralino-chargino mass difference. To illustrate our point we use a Supersymmetric model in which the gauginos are light, the sfermions are heavy and the Lightest Supersymmetric Particle (LSP) is the neutralino. In this framework the W{sup +}W{sup −} production is expected to be significant, thus leading to large p-bar and γ-ray fluxes. After determining a generic limit on the Dark Matter pair annihilation cross section into W{sup +}W{sup −} from the p-bar data only, we show that one can constrain scenarios in which the neutralino-chargino mass difference is as large as ≅ 20 GeV for a mixed neutralino (and intermediate choices of the p-bar propagation scheme). This result is consistent with the limit obtained by using the FERMI-LAT data. As a result, we can safely rule out the pure wino neutralino hypothesis if it is lighter than 450 GeV and constitutes all the Dark Matter.
- OSTI ID:
- 22279813
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2012, Issue 11; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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