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Article Dans Une Revue Nuclear Physics B Année : 2012

Cosmic-ray antiproton constraints on light singlino-like dark matter candidates

Résumé

The CoGeNT experiment, dedicated to direct detection of dark matter, has recently released excess events that could be interpreted as elastic collisions of ˜10 GeV dark matter particles, which might simultaneously explain the still mysterious DAMA/LIBRA modulation signals, while in conflict with results from other experiments such as CDMS, XENON-100 and SIMPLE. It was shown that 5-15 GeV singlino-like dark matter candidates arising in singlet extensions of minimal supersymmetric scenarios can fit these data; annihilation then mostly proceeds into light singlet-dominated Higgs (pseudo-)scalar fields. We develop an effective Lagrangian approach to confront these models with the existing data on cosmic-ray antiprotons, including the latest PAMELA data. Focusing on a parameter space consistent with the CoGeNT region, we show that the predicted antiproton flux is generically in tension with the data whenever the produced (pseudo-)scalars can decay into quarks energetic enough to produce antiprotons, provided the annihilation S-wave is significant at freeze out in the early universe. In this regime, a bound on the singlino annihilation cross section is obtained, <σv>≲10‑26 cm3/s, assuming a dynamically constrained halo density profile with a local value of ρ=0.4 GeV/cm3. Finally, we provide indications on how PAMELA or AMS-02 could further constrain or detect those configurations producing antiprotons which are not yet excluded.

Dates et versions

hal-00640514 , version 1 (12-11-2011)

Identifiants

Citer

David G. Cerdeño, Timur Delahaye, Julien Lavalle. Cosmic-ray antiproton constraints on light singlino-like dark matter candidates. Nuclear Physics B, 2012, 854, pp.738-779. ⟨10.1016/J.NUCLPHYSB.2011.09.020⟩. ⟨hal-00640514⟩
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