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U-boson at BESIII | | Shou-hua Zhu
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29 Dec 2006 | | Abstract: | The $O$(MeV) spin-1 U-boson has been proposed to mediate the interaction among electron-positron and $O$(MeV) dark matter, in order to account for the 511 keV $gamma$-ray observation by SPI/INTEGRAL. In this paper the observability of such kind of U-boson at BESIII is investigated through the processes $e^+e^- o U gamma$ and $e^+e^- o J/Psi o e^+e^- U$. We find that BESIII and high luminosity B-factories have the comparable capacity to detect such U-boson. If U-boson decays mainly into dark matter, i.e. invisibly, BESIII can measure the coupling among U-boson and electron-positron $g_{eR}$ (see text) down to $O(10^{-5})$, and cover large parameter space which can account for 511 keV $gamma$-ray observation. On the other hand, provided that U decays mainly into electron-positron, BESIII can detect $g_{eR}$ down to $O(10^{-3})$, and it is hard to explore 511 keV
$gamma$-ray measurement allowed parameter space due to the irreducible QED backgrounds. | | Source: | arXiv, hep-ph/0701001 | | Services: | Forum | Review | PDF | Favorites | |
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