Friday, 17 April 2015
Antiprotons from AMS
paper today. Predicting the antiproton spectrum is subject to large experimental uncertainties about the flux of cosmic ray proton and about the nuclear cross sections, as well as theoretical uncertainties inherent in models of cosmic ray propagation. The data and the predictions are compared in this Jamaican band plot. Apparently, the new AMS-02 data are situated near the upper end of the predicted range.
hooperon excess in the gamma ray emission from the galactic center.
More experimental input will allow us to tune the models of cosmic ray propagation to better predict the background. That, in turn, should lead to more stringent limits on dark matter. Who knows... maybe a hint for dark matter annihilation will emerge one day from this data; although, given the uncertainties, it's unlikely to ever be a smoking gun.
Thanks to Marco for comments and plots.