Extracting the size of the cosmic electron-positron anomaly
  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. We found a
deviation between the data and the predicted background even when
uncertainties, including systematics, were taken into account. We identified
this deviation with the anomalous electron-positron contribution. We briefly
compared this model independent signal to some theoretical results predicting
such an anomaly.
