Extracting the size of the cosmic electron-positron anomaly

Understand

We isolated the anomalous part of the cosmic electron-positron flux within a Bayesian likelihood analysis.

• Using 219 recent cosmic ray spectral data points, we inferred the values of selected cosmic ray propagation parameters.
• In the context of the propagation model coded in GalProp, we found a significant tension between the electron positron related and the rest of the fluxes.
• Interpreting this tension as the presence of an anomalous component in the electron-positron related data, we calculated background predictions for PAMELA and Fermi-LAT based on the non-electron-positron related fluxes.