Looking for a charge asymmetry in cosmic rays

TL;DR

This paper combines data from PAMELA and FERMI-LAT to test charge symmetry in cosmic ray leptons and predicts positron fractions for future AMS-02 measurements.

Contribution

It introduces a simple sum rule to analyze combined cosmic ray data for charge asymmetry and forecasts positron fractions at higher energies.

Findings

No charge asymmetry detected within current data

Predicted positron fraction at unexplored energies

Method enables future tests with AMS-02 data

Abstract

We combine the data from PAMELA and FERMI-LAT cosmic ray experiments by introducing a simple sum rule. This allows to investigate whether the lepton excess observed by these experiments is charge symmetric or not. We also show how the data can be used to predict the positron fraction at energies yet to be explored by the AMS-02 experiment.