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arXiv · 1005.1450

Search for a Low Mass Particle Decaying into mu^+ mu^- in B0-> K*0 X and B0-> rho0 X at Belle

H. J. Hyun·H. K. Park·H. O. Kim·H. Park et al.
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Abstract

We search for dimuon decays of a low mass particle in the decays B0->K*0 X and B0->rho X using a data sample of 657x10^6 B Bbar events collected with the Belle detector at the KEKB asymmetric-energy e^+ e^- collider. We find no evidence for such a particle in the mass range from 212 MeV/c2 to 300 MeV/c2, and set upper limits on its branching fractions. In particular, we search for a particle with a mass of 214.3 MeV/c2 reported by the HyperCP experiment, and obtain upper limits on the products B(B0->K*0 X)xB(X->mu^+ mu^-) < 2.26 (2.27)x10^-8 and B(B0->rho0 X)xB(X->mu^+ mu^-) < 1.73 (1.73)x10^-8 at 90% C.L. for a scalar (vector) X particle.

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H. J. Hyun, H. K. Park, H. O. Kim, H. Park et al.. 2010-05-10. Search for a Low Mass Particle Decaying into mu^+ mu^- in B0-> K*0 X and B0-> rho0 X at Belle. https://doi.org/10.1103/physrevlett.105.091801

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