Speaker
Cheng Zhang
(Institute of High Energy Physics,CAS(CN))
Description
The positron flux measured by the AMS exhibits complex energy dependence. In the entire energy range the positron flux is well described by the sum of a power-law term associated with the positrons produced in the collision of cosmic rays, which dominates at low energies, and a new source term of positrons, which dominates at high energies. This new source has a finite energy cutoff, which is established with a significance of ~5σ. These experimental data on cosmic ray positrons show that, at high energies, they predominantly originate either from dark matter annihilation or from a new astrophysical source.
| Collaboration(s) | AMS |
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Author
Cheng Zhang
(Institute of High Energy Physics,CAS(CN))
