Search for a Low Mass Particle Decaying into mu(+)mu(-) in B(0)-> K*(0)X and B(0)->rho(0)X at Belle

H. J. Hyun,H. K. Park,H. O. Kim,H. Park,Hiroaki Aihara, K. Arinstein, T. Aushev, A. M. Bakich, E. L. Barberio, A. Bay, K. Belous, M. Bischofberger, A.E. Bondar, A. Bozek, M. Bračko,M. C. Chang,P. Chang, Y. Chao,A. Chen,Po-Hsun Chen, B. G. Cheon,I. S. Cho,Y. Choi, J. Dalseno, M. Danilov, M. Dash, A. Drutskoy, S.I. Eidelman, N. Gabyshev, B. Golob, H. Ha, T. Hara, Yasuyuki Horii, Y. Hoshi,W. S. Hou, Y. B. Hsiung, K. Inami, Y. Iwasaki,N. J. Joshi,D. H. Kah,J. H. Kang, P. Kapusta, T. Kawasaki,H. Kichimi, C. Kiesling,H. J. Kim, Jung-Hyun Kim, M. J. Kim, B. R. Ko,Peter Kodys, P. Križan,A.S. Kuzmin, Y. J. Kwon, S. H. Kyeong,J. S. Lange,Sang Hoon Lee,J. Li, D. Liventsev, R. Louvot, A. Matyja, S. McOnie, K. Miyabayashi,H. Miyata, Y. Miyazaki, G. B. Mohanty, E. Nakano, H. Nakazawa, S. Nishida, K. Nishimura,O. Nitoh,T. Ohshima, S. Okuno,S. L. Olsen, H. Palka,C. W. Park, R. Pestotnik,Marko Petrič,L. E. Piilonen,Sunmin Ryu, H. Sahoo, Y. Sakai, O. Schneider, M. E. Sevior, M. Shapkin, J. G. Shiu,B.A. Shwartz,Jasvinder A. Singh,Samo Stanič, M. Starič, T. Sumiyoshi, S. Suzuki, Y. Teramoto, K. Trabelsi, S. Uehara

msra（2010）

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摘要

We search for dimuon decays of a low mass particle in the decays B-0 -> K*X-0 and B-0 -> rho X-0 using a data sample of 657 x 10(6)B (B) over bar 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/c(2) to 300 MeV/c(2) 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/c(2) reported by the HyperCP experiment, and obtain upper limits on the products B(B-0 -> K*X-0) x B(X mu(+)mu(-)) rho X-0) x B(X -> mu(+)mu(-)) < 1.73(1.73) x 10(-8) at 90% C.L. for a scalar (vector) X particle.

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