Mr. Valerio Vagelli (Karlsruhe Institute for Technology)Dr. Zhili Weng (Massachusetts Institute of Technology)
Origin of high energy positrons in cosmic rays remains highly uncertain. In addition to being produced in the interactions of cosmic ray nuclei with interstellar media they may be produced in nearby pulsars, in the annihilation of Dark Matter particles or in a yet unknown process. The nature of the production mechanisms are expected to influence the abundance of cosmic-ray positrons and electorns. The Alpha Magnetic Spectrometer (AMS-02) is a general purpose high-energy particle physics detector operational on the International Space Station since May 2011 to conduct fundamental physics research in space. During its unique long duration mission (about 20 years), AMS-02 will collect large amount of data of unparalleled significance to study positron flux and electron flux seperately, as well as their time-dependence and directional-dependence behavior. In this contribution, data sample collected during the first 30 months of operations will be used. We will review the analysis technique used for measuring positron flux and electron flux, as well as positron fraction extending to energies beyond the published results. Anisotropy of individual fluxes will be also discussed.