Galactic 511 keV line from MeV millicharged dark matter

Ji Haeng Huh; Jihn E. Kim; Jong Chul Park; Seong Chan Park

doi:10.1103/PhysRevD.77.123503

Galactic 511 keV line from MeV millicharged dark matter

Ji Haeng Huh, Jihn E. Kim, Jong Chul Park, Seong Chan Park

Department of Physics

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58 Citations (Scopus)

Abstract

We present a possible explanation of the recently observed 511 keV γ-ray anomaly with a new "millicharged" fermion. The new fermion is light [O(MeV)] but has never been observed by any collider experiments mainly because of its tiny electromagnetic charge εe. We show that constraints from its relic density in the Universe and collider experiments allow a parameter range such that the 511 keV cosmic γ-ray emission from the galactic bulge may be due to positron production from this millicharged fermion.

Original language	English
Article number	123503
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	77
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevD.77.123503
Publication status	Published - 2008 Jun 3

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Physics and Astronomy (miscellaneous)

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10.1103/PhysRevD.77.123503

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AB - We present a possible explanation of the recently observed 511 keV γ-ray anomaly with a new "millicharged" fermion. The new fermion is light [O(MeV)] but has never been observed by any collider experiments mainly because of its tiny electromagnetic charge εe. We show that constraints from its relic density in the Universe and collider experiments allow a parameter range such that the 511 keV cosmic γ-ray emission from the galactic bulge may be due to positron production from this millicharged fermion.

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Galactic 511 keV line from MeV millicharged dark matter

Abstract

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