Galactic 511 keV line from MeV millicharged dark matter

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dc.creatorHuh, Ji-Haeng
dc.creatorKim, Jihn E.
dc.creatorPark, Jong-Chul
dc.creatorPark, Seong Chan
dc.date2007-11-22
dc.date2008-05-25
dc.date.accessioned2026-07-07T11:38:51Z
dc.date.available2026-07-07T11:38:51Z
dc.descriptionWe present a possible explanation of the recently observed 511 keV $γ$-ray anomaly with a new ``millicharged'' fermion. The new fermion is light (${\cal O}({\rm MeV})$) 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.
dc.description14 pages, 3 figures; To appear in Phys. Rev. D
dc.identifierhttps://arxiv.org/abs/0711.3528
dc.identifierhttp://arxiv.org/abs/0711.3528
dc.identifierPhys.Rev.D77:123503,2008
dc.identifierdoi:10.1103/PhysRevD.77.123503
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/199716
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Phenomenology
dc.titleGalactic 511 keV line from MeV millicharged dark matter
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