A proposed MDM goes beyond the standard model in a minimal way, so as to produce a candidate for dark matter. Here is story from Nature News: http://www.nature.com/news/2008/080902/full/455007a.html Here is a key excerpt: ==quote== ...It now seems that some physicists have taken matters into their own hands. At least two papers recently appeared on the preprint server arXiv.org showing representations of PAMELA's latest findings (M. Cirelli et al. http://arxiv.org/abs/0808.3867 ; 2008, and L. Bergstrom et al. http://arxiv.org/abs/0808.3725 ; 2008). Both have recreated data from photos taken of a PAMELA presentation on 20 August at the Identification of Dark Matter conference in Stockholm, Sweden. "We had our digital cameras ready," says Marco Cirelli,... ==endquote== The ethics of Cirelli breaking the embargo imposed by Nature on the PAMELA satellite data is not the topic here. I disapprove, as perhaps most people do, Cirelli's action. That said, the issue here is what about this proposed MDM extension of the Standard Model? Does it predict an excess of positrons, over what would otherwise be expected, arising from dark matter particle collisions and dark matter annihilation? Does this fit the PAMELA data---rather a lot of positrons observed by a satellite in orbit. The article by Cirelli reproduces preliminary data---so you can see the plots. Here is the article: http://arxiv.org/abs/0808.3867 Minimal Dark Matter predictions and the PAMELA positron excess Marco Cirelli, Alessandro Strumia To appear in the proceedings of the Identification of Dark Matter conference (idm2008), Stockholm, 18-22 August 2008 (Submitted on 28 Aug 2008) "We present Minimal Dark Matter and its univocal predictions for Dark Matter observables. During the idm2008 conference, PAMELA presented preliminary results showing an excess in the positron fraction: we find a good agreement, with a modest astrophysical boost factor."