New positron spectral features from supersymmetric dark matter: A way to explain the PAMELA data?
By L. Bergstrom, T. Bringmann, J. Edsjo. 2008
259 citations recorded by the source corpus.
Department of Physics, Stockholm University, AlbaNova University Center, SE - 106 91 Stockholm, Sweden(Dated: August 27, 2008)The space-borne antimatter experiment PAMELA has recently reported a surprising rise in thepositron to electron ratio at high energies. It has also recently been found that electromagneticradiative corrections in some cases may boost the gamma-ray yield from supersymmetric darkmatter annihilations in the galactic halo by up to three or four orders of magnitude, providingdistinct spectral signatures for indirect dark matter searches to look for. Here, we investigatewhether the same type of corrections can also lead to sizeable enhancements in the positron yield.We find that this is indeed the case, albeit for a smaller region of parameter space than for gammarays; selecting models with a small mass difference between the neutralino and sleptons, like inthe stau coannihilation region in mSUGRA, the effect becomes more pronounced. The resulting,rather hard positron spectrum with a relatively sharp cutoff may potentially fit the rising positronratio measured by the PAMELA satellite. To do so, however, very large “boost factors” have tobe invoked that are not expected in current models of halo structure. If the predicted cutoff wouldalso be confirmed by later PAMELA data or upcoming experiments, one could either assume non-thermal production in the early universe or non-standard halo formation to explain such a spectralfeature as an effect of dark matter annihilation. At the end of the paper, we briefly comment onthe impact of radiative corrections on other annihilation channels, in particular antiprotons andneutrinos.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/4241aeddd8df3e7e79e1f4954e345213dcaff414
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Citations in the corpus
- DarkSUSY 6: an advanced tool to compute dark matter properties numerically (2018, background): “While this may lead to striking spectral features in the spectrum of gamma rays [166] or positrons [167] relevant for indirect detection, the effect on relic density calculations is very small.”
- Gamma Ray Signals from Dark Matter: Concepts, Status and Prospects (2012, background): “Scanning a simple phenomenological MSSM-9 [300], where this assumption is relaxed, we found the top right branch of non-thermally produced models (open red symbols in Fig.”
- Fermi LAT Search for Internal Bremsstrahlung Signatures from Dark Matter Annihilation (2012, background): “The explicit expression for the annihilation cross-section into two massless fermions and one VIB photon is [45, 55]:”
- Galactic electrons and positrons at the Earth: new estimate of the primary and secondary fluxes (2010, background): “…could indeed in some cases manifests itself in this channel (e.g. Baltz & Edsjö 1998; Hooper & Kribs 2004; Lavalle et al. 2007; Asano et al. 2007; Bergström et al. 2008; Cirelli et al. 2008; Delahaye et al. 2008; Pieri et al. 2009; Catena et al. 2009), and the discovery of an exotic…”