Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 11, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2012/11/028
Keywords
dark matter theory; cosmic ray experiments; particle physics - cosmology connection; gamma ray experiments
Funding
- INFN
- French national research agency ANR [ANR 2010 BLANC 041301]
- EU ITN network UNILHC
- Russian foundation for Basic Research [RFBR-10-02-01443-a, RFBR-12-02-93108-CNRSLa]
- LIA-TCAP of CNRS
- CMIRA 2011 EXPLO'RA DOC grant
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Searches for Dark Matter (DM) particles with indirect detection techniques have reached important milestones with the precise measurements of the anti-proton ((p) over bar) and gamma-ray spectra, notably by the PAMELA and FERMI-LAT experiments. While the gamma-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+W- production is expected to be significant, thus leading to large (p) over bar and gamma-ray fluxes. After determining a generic limit on the Dark Matter pair annihilation cross section into W+W- from the (p) over bar data only, we show that one can constrain scenarios in which the neutralino-chargino mass difference is as large as similar or equal to 20 GeV for a mixed neutralino (and intermediate choices of the (p) over 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.
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