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- W2068663878 abstract "We search for dimuon decays of a low mass particle in the decays B0→K*0X and B0→ρ0X using a data sample of 657×106BB¯ 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 for lifetimes below 10−12 s, 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*0X)×B(X→μ+μ−)<2.26(2.27)×10−8 and B(B0→ρ0X)×B(X→μ+μ−)<1.73(1.73)×10−8 at 90% C.L. for a scalar (vector) X particle.Received 8 May 2010DOI:https://doi.org/10.1103/PhysRevLett.105.091801© 2010 The American Physical Society" @default.
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