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Author Hyun, H. J. ♦ Park, H. K. ♦ Kim, H. O. ♦ Park, H. ♦ Kah, D. H. ♦ Kim, H. J. ♦ Kim, M. J. ♦ Aihara, H. ♦ Arinstein, K. ♦ Bondar, A. ♦ Eidelman, S. ♦ Gabyshev, N. ♦ Kuzmin, A. ♦ Shwartz, B. ♦ Zhilich, V. ♦ Zyukova, O. ♦ Aushev, T. ♦ Bakich, A. M. ♦ McOnie, S. ♦ Varvell, K. E.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ♦ ASYMMETRY ♦ B NEUTRAL MESONS ♦ BRANCHING RATIO ♦ K*-892 MESONS ♦ LIFETIME ♦ MEV RANGE ♦ MULTIPARTICLE SPECTROMETERS ♦ MUONS MINUS ♦ MUONS PLUS ♦ PARTICLE DECAY ♦ PARTICLE IDENTIFICATION ♦ REST MASS ♦ RHO-770 MESONS ♦ ANTILEPTONS ♦ ANTIMATTER ♦ ANTIPARTICLES ♦ B MESONS ♦ BEAUTY MESONS ♦ BEAUTY PARTICLES ♦ BOSONS ♦ DECAY ♦ DIMENSIONLESS NUMBERS ♦ ELEMENTARY PARTICLES ♦ ENERGY RANGE ♦ FERMIONS ♦ HADRONS ♦ LEPTONS ♦ MASS ♦ MATTER ♦ MEASURING INSTRUMENTS ♦ MESONS ♦ MUONS ♦ PSEUDOSCALAR MESONS ♦ SPECTROMETERS ♦ STRANGE MESONS ♦ STRANGE PARTICLES ♦ VECTOR MESONS
Abstract We search for dimuon decays of a low mass particle in the decays B{sup 0{yields}}K{sup *0}X and B{sup 0{yields}{rho}0}X using a data sample of 657x10{sup 6}BB events collected with the Belle detector at the KEKB asymmetric-energy e{sup +}e{sup -} collider. We find no evidence for such a particle in the mass range from 212 MeV/c{sup 2} to 300 MeV/c{sup 2} for lifetimes below 10{sup -12} s, and set upper limits on its branching fractions. In particular, we search for a particle with a mass of 214.3 MeV/c{sup 2} reported by the HyperCP experiment, and obtain upper limits on the products B(B{sup 0}{yields}K{sup *0}X)xB(X{yields}{mu}{sup +}{mu}{sup -})<2.26(2.27)x10{sup -8} and B(B{sup 0}{yields}{rho}{sup 0}X)xB(X{yields}{mu}{sup +}{mu}{sup -})<1.73(1.73)x10{sup -8} at 90% C.L. for a scalar (vector) X particle.
ISSN 00319007
Educational Use Research
Learning Resource Type Article
Publisher Date 2010-08-27
Publisher Place United States
Journal Physical Review Letters
Volume Number 105
Issue Number 9


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