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The AMS-02 has just published the unprecedentedly precise measurement of thecosmic electron and positron spectra. In this paper we try to give aquantitative study on the AMS-02 results by a global fitting to the electronand positron spectra, together with the updated positron fraction data. TheMarkov Chain Monte Carlo algorithm is adopted to do the fitting. The primaryelectron spectrum and the parameters for pulsars or dark matter whichcontribute extra positrons are determined simultaneously. We find that there isa hardening of the primary electron spectrum at $\sim 60$ GeV. With such a newfeature at the background spectrum both the pulsars and dark matter can explainthe AMS-02 results very well. The dark matter scenario shows a drop at positronfraction at $\sim 300$ GeV, however, suffers very strong constraints from Fermi$\gamma$-ray observations. The fitting results also suggest that thepropagation model with convection may be more favored by the lepton data thanthe reacceleration model.

Quantitative study of the AMS-02 electron/positron spectra: implications for the pulsar and dark matter properties