期刊
PHYSICAL REVIEW D
卷 78, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.78.115002
关键词
-
资金
- Department of Energy [DE-AC02-06CH11357, DE-FG02-91ER40684]
A model has been proposed in which neutral scalar particles chi, of mass 1-10 MeV, annihilate through the exchange of a light vector boson U, of mass 10-100 MeV, to produce the 511 keV line observed emanating from the center of the Galaxy. The chi interacts weakly with normal matter and is a viable dark matter candidate. If the U boson couples to quarks as well as to electrons, it could enhance the branching ratio for the rare decay pi(0) -> e(+)e(-). A recent measurement by the KTeV Collaboration lies 3 standard deviations above a prediction by Dorokhov and Ivanov, and we relate this excess to the couplings of the U boson. The values are consistent with other constraints and considerations. We make some comments on possible improvements in the data.
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