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 Σ+ → p μ+ μ- can be generated at both tree and loop levels. In particular, we find that the loop induced s → 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.
|Number of pages||5|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2008 Jun 5|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics