Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-08-07
Phys.Lett.B663:400-404,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 2 figures, refs. added, final version to appear in PLB
Scientific paper
10.1016/j.physletb.2008.04.053
We show that the very light spin-1 gauge U-boson of the extra $U(1)'$ gauge model in the framework of the supersymmetric standard model extension can be a good candidate of the new light particle suggested by the HyperCP experiment. We demonstrate that the flavor changing neutral currents (FCNCs) for the HyperCP events in the decay of $\Sigma^{+}\to p \mu^{+} \mu^{-}$ can be generated at both tree and loop levels. In particular, we find that the loop induced $s\to d U$ transition due to the tensor-type interaction with the dimension-5 electric dipole operator plays a very important role on the FCNCs. Our explanation of the HyperCP data with the spin-1 U-boson is different from that based on a light pseudoscalar Higgs boson or sgoldstino in the literature. In particular, the U-boson involves a rich phenomenology in particle physics as well as cosmology.
Chen Chuan-Hung
Geng Chao-Qiang
Kao Chung-Wen
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