Search for a low mass particle decaying into μ+μ - in B0→K*0X and B0→ρ0X at Belle

H. J. Hyun, H. K. Park, H. O. Kim, H. Park, H. Aihara, K. Arinstein, T. Aushev, A. M. Bakich, E. Barberio, A. Bay, K. Belous, M. Bischofberger, A. Bondar, A. Bozek, M. Bračko, M. C. Chang, P. Chang, Y. Chao, A. Chen, P. ChenB. G. Cheon, I. S. Cho, Y. Choi, J. Dalseno, M. Danilov, M. Dash, A. Drutskoy, S. Eidelman, N. Gabyshev, B. Golob, H. Ha, T. Hara, Y. 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, J. H. Kim, M. J. Kim, B. R. Ko, P. Kodyš, P. Križan, A. Kuzmin, Y. J. Kwon, S. H. Kyeong, J. S. Lange, S. H. 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, M. Petrič, L. E. Piilonen, S. Ryu, H. Sahoo, Y. Sakai, O. Schneider, M. E. Sevior, M. Shapkin, J. G. Shiu, B. Shwartz, J. B. Singh, S. Stanič, M. Starič, T. Sumiyoshi, S. Suzuki, Y. Teramoto, K. Trabelsi, S. Uehara, Y. Unno, S. Uno, G. Varner, K. E. Varvell, K. Vervink, C. H. Wang, M. Z. Wang, P. Wang, X. L. Wang, R. Wedd, E. Won, B. D. Yabsley, Y. Yamashita, Z. P. Zhang, V. Zhilich, O. Zyukova

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


We search for dimuon decays of a low mass particle in the decays B0→K*0X and B0→ρ0X using a data sample of 657×106BB̄ 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 212MeV/c2 to 300MeV/c2 for lifetimes below 10-12s, and set upper limits on its branching fractions. In particular, we search for a particle with a mass of 214.3MeV/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.

Original languageEnglish
Article number091801
JournalPhysical review letters
Issue number9
Publication statusPublished - 2010 Aug 25

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


Dive into the research topics of 'Search for a low mass particle decaying into μ+μ - in B0→K*0X and B0→ρ0X at Belle'. Together they form a unique fingerprint.

Cite this