U-boson and the HyperCP exotic events

Abstract

We show that the very light spin-1 gauge U-boson of the extra $U(1{)}^{\prime }$ 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 $s\to dU$ 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.

12 pages, 2 figures, refs. added, final version to appear in PLB

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• Search for a light exotic particle in J/psi radiative decays
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• Search for a Low Mass Particle Decaying into mu^+ mu^- in B0-> K*0 X and B0-> rho0 X at Belle
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• CP phase of nonuniversal $Z^{\prime }$ on $\sin {\varphi }_s^{J/\Psi \varphi }$ and T-odd observables of ${\bar{B}}_q\to V_q{\ell }^{+}{\ell }^{-}$
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• Effects of the U-boson on the inner edge of neutron star crusts
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• Decay rate and asymmetries of ${\Sigma }^{+}\to p{\mu }^{+}{\mu }^{-}$
• Observation of the very rare ${\Sigma }^{+}\to p{\mu }^{+}{\mu }^{-}$ decay
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• Implication of the HyperCP boson $X^0$ (214 MeV) in the flavour changing neutral current processes