Model independent interpretation of recent CR lepton data after AMS-02
Daniele Gaggero (SISSA, INFN, Trieste), Luca Maccione (LMU and, MPP, Munich)
TL;DR
This paper analyzes cosmic ray lepton data from AMS-02, Fermi-LAT, and PAMELA, proposing a model with a standard and an extra charge symmetric component, and finds compatibility among datasets with some systematic considerations.
Contribution
It introduces a model-independent approach to interpret cosmic ray lepton data, allowing for charge symmetry deviations and systematic effects in the datasets.
Findings
AMS and Fermi-LAT data can be reconciled within uncertainties
No significant evidence for charge asymmetry in the extra component
Energy-dependent effects may explain some systematic discrepancies
Abstract
We model the CR leptonic fluxes above 20 GeV in terms of a superposition of a standard and a charge symmetric extra component, which we generically describe as power-laws in momentum. We investigate under these hypotheses the compatibility between AMS-02, Fermi-LAT and PAMELA datasets on positron fraction, electron+positron spectrum and electron spectrum respectively. We find that it is possible to reconcile AMS and Fermi-LAT data within uncertainties, if energy-dependent effects are present in Fermi-LAT systematics. We also study possible deviations from charge symmetry in the extra component and find no compelling evidence for them.
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