Beacom, John F. and Bell, Nicole F. and Bertone, Gianfranco (2005) Gamma-Ray Constraint on Galactic Positron Production by MeV Dark Matter. Physical Review Letters, 94 (17). Art. No. 171301. ISSN 0031-9007 http://resolver.caltech.edu/CaltechAUTHORS:BEAprl05
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The Galactic positrons, as observed by their annihilation gamma-ray line at 0.511 MeV, are difficult to account for with astrophysical sources. It has been proposed that they are produced instead by dark matter annihilation or decay in the inner Galactic halo. To avoid other constraints, these processes are required to occur "invisibly," such that the eventual positron annihilation is the only detectable signal. However, electromagnetic radiative corrections to these processes inevitably produce real gamma rays ("internal bremsstrahlung"); this emission violates COMPTEL and EGRET constraints unless the dark matter mass is less than about 20 MeV.
|Additional Information:||©2005 The American Physical Society (Received 16 September 2004; published 5 May 2005) We are grateful to C. Boehm, S. Boggs, E. Braaten, V. Cirigliano, D. Hartmann, M. Leising, D. Rainwater, and M. Ramsey-Musolf for comments on the manuscript. J.F.B. was supported by funds from The Ohio State University, and N.F.B. and G. B. by Fermilab (operated by URA under DOE Contract No. DE-AC02-76CH03000) and by NASA Grant No. NAG5-10842.|
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