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Cosmic ray positron measurements reveal a new high-energy source, potentially from dark matter annihilation or astrophysical phenomena, with a cutoff around 810 GeV.

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Area of Science:

  • Particle Physics
  • Astrophysics
  • Cosmic Ray Physics

Background:

  • Cosmic rays provide insights into high-energy astrophysical processes.
  • Understanding the origin of cosmic ray positrons is crucial for particle physics and astrophysics.

Purpose of the Study:

  • To present precision measurements of cosmic ray positrons up to 1 TeV.
  • To investigate the energy dependence and origin of cosmic ray positrons.

Main Methods:

  • Analysis of 1.9 million positrons collected by the Alpha Magnetic Spectrometer (AMS) on the International Space Station.
  • Detailed examination of positron flux energy spectrum and its distinctive features.

Main Results:

  • Observed a significant positron excess starting at 25.2±1.8 GeV.
  • Identified a sharp dropoff in flux above 284_{-64}^{+91} GeV.
  • Established a finite energy cutoff for a new positron source term at 810_{-180}^{+310} GeV (significance > 4σ).

Conclusions:

  • The positron flux is consistent with a combination of standard cosmic ray interactions and a new high-energy source.
  • The new source, dominant at high energies, may originate from dark matter annihilation or other astrophysical sources.