Search for a low mass particle decaying into μ+ μ- in B0 → K*0 X and B0 → ρ0 X 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 Bracko; M-C Chang; P Chang; Y Chao; A Chen; P Chen; B 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 Kodys; P Krizan; 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 Petric; 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 Stanic; M Staric; 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; Belle Collaboration

doi:10.1103/PhysRevLett.105.091801

Search for a low mass particle decaying into μ+ μ- in B0 → K*0 X and B0 → ρ0 X at Belle

Phys Rev Lett. 2010 Aug 27;105(9):091801. doi: 10.1103/PhysRevLett.105.091801. Epub 2010 Aug 25.

Authors

H J Hyun¹, 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 Bracko, M-C Chang, P Chang, Y Chao, A Chen, P Chen, B 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 Kodys, P Krizan, 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 Petric, 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 Stanic, M Staric, 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; Belle Collaboration

Affiliation

¹ Kyungpook National University, Taegu.

PMID: 20868151
DOI: 10.1103/PhysRevLett.105.091801

Abstract

We search for dimuon decays of a low mass particle in the decays B0→K*0 X and B0→ρ0 X using a data sample of 657×10(6)BB 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*0 X)×B(X→μ+ μ- )<2.26(2.27)×10(-8) and B(B0→ρ0 X)×B(X→μ+ μ-)<1.73(1.73)×10(-8) at 90% C.L. for a scalar (vector) X particle.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Algorithms
Energy Transfer
Ions
Models, Chemical*
Nanoparticles / chemistry*
Nuclear Physics*
Particle Accelerators

Substances

Ions