Study of J/psi-->pp[over],LambdaLambda[over] and observation of eta(c)-->LambdaLambda[over] at Belle

C-H Wu; M-Z Wang; K Abe; I Adachi; H Aihara; V Aulchenko; T Aushev; S Bahinipati; A M Bakich; V Balagura; A Bay; K Belous; U Bitenc; I Bizjak; S Blyth; A Bondar; A Bozek; T E Browder; Y Chao; A Chen; W T Chen; B G Cheon; Y Choi; Y K Choi; A Chuvikov; S Cole; J Dalseno; M Danilov; M Dash; S Eidelman; N Gabyshev; T Gershon; A Go; G Gokhroo; A Gorisek; H Ha; J Haba; K Hayasaka; H Hayashii; M Hazumi; D Heffernan; T Hokuue; S Hou; W-S Hou; Y B Hsiung; T Iijima; K Inami; A Ishikawa; R Itoh; M Iwasaki; Y Iwasaki; J H Kang; S U Kataoka; N Katayama; H Kawai; T Kawasaki; H R Khan; H Kichimi; H J Kim; H O Kim; Y J Kim; P Krizan; P Krokovny; R Kulasiri; R Kumar; C C Kuo; A Kuzmin; Y-J Kwon; G Leder; J Lee; Y-J Lee; T Lesiak; S-W Lin; D Liventsev; G Majumder; F Mandl; T Matsumoto; A Matyja; S McOnie; W Mitaroff; K Miyabayashi; H Miyake; H Miyata; Y Miyazaki; R Mizuk; T Mori; E Nakano; M Nakao; Z Natkaniec; S Nishida; O Nitoh; S Ogawa; T Ohshima; T Okabe; S Okuno; S L Olsen; Y Onuki; H Ozaki; P Pakhlov; H Palka; H Park; K S Park; R Pestotnik; L E Piilonen; Y Sakai; T Schietinger; O Schneider; A J Schwartz; R Seidl; M E Sevior; M Shapkin; H Shibuya; V Sidorov; A Sokolov; A Somov; N Soni; S Stanic; M Staric; H Stoeck; T Sumiyoshi; F Takasaki; M Tanaka; G N Taylor; Y Teramoto; X C Tian; T Tsuboyama; T Tsukamoto; S Uehara; T Uglov; K Ueno; S Uno; P Urquijo; Y Usov; G Varner; C C Wang; C H Wang; Y Watanabe; E Won; B D Yabsley; A Yamaguchi; Y Yamashita; L M Zhang; Z P Zhang; Belle Collaboration

doi:10.1103/PhysRevLett.97.162003

Study of J/psi-->pp[over],LambdaLambda[over] and observation of eta(c)-->LambdaLambda[over] at Belle

Phys Rev Lett. 2006 Oct 20;97(16):162003. doi: 10.1103/PhysRevLett.97.162003. Epub 2006 Oct 19.

Authors

C-H Wu¹, M-Z Wang, K Abe, I Adachi, H Aihara, V Aulchenko, T Aushev, S Bahinipati, A M Bakich, V Balagura, A Bay, K Belous, U Bitenc, I Bizjak, S Blyth, A Bondar, A Bozek, T E Browder, Y Chao, A Chen, W T Chen, B G Cheon, Y Choi, Y K Choi, A Chuvikov, S Cole, J Dalseno, M Danilov, M Dash, S Eidelman, N Gabyshev, T Gershon, A Go, G Gokhroo, A Gorisek, H Ha, J Haba, K Hayasaka, H Hayashii, M Hazumi, D Heffernan, T Hokuue, S Hou, W-S Hou, Y B Hsiung, T Iijima, K Inami, A Ishikawa, R Itoh, M Iwasaki, Y Iwasaki, J H Kang, S U Kataoka, N Katayama, H Kawai, T Kawasaki, H R Khan, H Kichimi, H J Kim, H O Kim, Y J Kim, P Krizan, P Krokovny, R Kulasiri, R Kumar, C C Kuo, A Kuzmin, Y-J Kwon, G Leder, J Lee, Y-J Lee, T Lesiak, S-W Lin, D Liventsev, G Majumder, F Mandl, T Matsumoto, A Matyja, S McOnie, W Mitaroff, K Miyabayashi, H Miyake, H Miyata, Y Miyazaki, R Mizuk, T Mori, E Nakano, M Nakao, Z Natkaniec, S Nishida, O Nitoh, S Ogawa, T Ohshima, T Okabe, S Okuno, S L Olsen, Y Onuki, H Ozaki, P Pakhlov, H Palka, H Park, K S Park, R Pestotnik, L E Piilonen, Y Sakai, T Schietinger, O Schneider, A J Schwartz, R Seidl, M E Sevior, M Shapkin, H Shibuya, V Sidorov, A Sokolov, A Somov, N Soni, S Stanic, M Staric, H Stoeck, T Sumiyoshi, F Takasaki, M Tanaka, G N Taylor, Y Teramoto, X C Tian, T Tsuboyama, T Tsukamoto, S Uehara, T Uglov, K Ueno, S Uno, P Urquijo, Y Usov, G Varner, C C Wang, C H Wang, Y Watanabe, E Won, B D Yabsley, A Yamaguchi, Y Yamashita, L M Zhang, Z P Zhang; Belle Collaboration

Affiliation

¹ Department of Physics, National Taiwan University, Taipei, Taiwan.

PMID: 17155387
DOI: 10.1103/PhysRevLett.97.162003

Abstract

We study the baryonic charmonium decays of B mesons B+-->etacK+ and B+-->J/psiK+, where the etac and J/psi subsequently decay into a pp[over] or LambdaLambda[over] pair. We measure the J/psi-->pp[over] and LambdaLambda[over] anisotropy parameters alphaB=-0.60+/-0.13+/-0.14 (pp[over]), -0.44+/-0.51+/-0.31 (LambdaLambda[over ]) and compare to results from e;{+}e;{-}-->J/psi formation experiments. We also report the first observation of etac-->LambdaLambda[over]. The measured branching fraction is B(etac-->LambdaLambda[over ])=(0.87(+0.24)/(-0.21)(stat)(+0.09/-0.14) (syst)+/-0.27(PDG))x10-3. This study is based on a 357 fb-1 data sample recorded on the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+ e- collider.