Enhancement of dark matter annihilation via Breit-Wigner resonance

Journal Article · Sun Mar 01 00:00:00 EST 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.79.055012· OSTI ID:21260106

Wanlei, Guo; Yueliang, Wu ^[1]

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1. Kavli Institute for Theoretical Physics China, Key Laboratory of Frontiers in Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Science, Beijing 100190 (China)

The Breit-Wigner enhancement of the thermally averaged annihilation cross section <{sigma}v> is shown to provide a large boost factor when the dark matter annihilation process nears a narrow resonance. We explicitly demonstrate the evolution behavior of the Breit-Wigner enhanced <{sigma}v> as the function of universe temperature for both the physical and unphysical pole cases. It is found that both of the cases can lead a large enough boost factor to explain the recent PAMELA, ATIC, and PPB-BETS anomalies. We also calculate the coupling of the annihilation process, which is useful for an appropriate model building to give the desired dark matter relic density.

• OSTI ID: 21260106
• Journal Information: Physical Review. D, Particles Fields, Vol. 79, Issue 5; Other Information: DOI: 10.1103/PhysRevD.79.055012; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
BREIT-WIGNER FORMULA
COMPUTERIZED SIMULATION
COUPLING
CROSS SECTIONS
DENSITY
NONLUMINOUS MATTER
RESONANCE
UNIVERSE