Measurement of the e+e- -->pi+pi- J/psi cross section via initial-state radiation at Belle

C Z Yuan; C P Shen; P Wang; S McOnie; I Adachi; H Aihara; V Aulchenko; T Aushev; S Bahinipati; V Balagura; E Barberio; I Bedny; U Bitenc; A Bondar; A Bozek; M Bracko; J Brodzicka; T E Browder; M-C Chang; P Chang; A Chen; K-F Chen; W T Chen; B G Cheon; R Chistov; I-S Cho; Y Choi; J Dalseno; M Danilov; M Dash; S Eidelman; S Fratina; N Gabyshev; B Golob; H Ha; J Haba; K Hayasaka; H Hayashii; M Hazumi; D Heffernan; T Hokuue; Y Hoshi; W-S Hou; Y B Hsiung; H J Hyun; T Iijima; K Ikado; K Inami; A Ishikawa; R Itoh; Y Iwasaki; D H Kah; H Kaji; J H Kang; N Katayama; H Kawai; T Kawasaki; H Kichimi; Y J Kim; K Kinoshita; S Korpar; P Krizan; P Krokovny; R Kumar; C C Kuo; A Kuzmin; Y-J Kwon; S E Lee; T Lesiak; S-W Lin; Y Liu; D Liventsev; F Mandl; D Marlow; A Matyja; T Medvedeva; W Mitaroff; K Miyabayashi; H Miyake; H Miyata; Y Miyazaki; R Mizuk; T Mori; Y Nagasaka; M Nakao; Z Natkaniec; S Nishida; O Nitoh; S Ogawa; T Ohshima; S Okuno; S L Olsen; H Ozaki; P Pakhlov; G Pakhlova; H Palka; H Park; K S Park; L S Peak; L E Piilonen; Y Sakai; O Schneider; J Schümann; R Seidl; K Senyo; M E Sevior; M Shapkin; H Shibuya; J-G Shiu; B Shwartz; J B Singh; A Sokolov; A Somov; M Staric; T Sumiyoshi; F Takasaki; M Tanaka; G N Taylor; Y Teramoto; I Tikhomirov; S Uehara; Y Unno; S Uno; Y Usov; G Varner; K E Varvell; K Vervink; S Villa; A Vinokurova; C C Wang; C H Wang; X L Wang; Y Watanabe; E Won; B D Yabsley; A Yamaguchi; Y Yamashita; C C Zhang; Z P Zhang; V Zhilich; V Zhulanov; A Zupanc; Belle Collaboration

doi:10.1103/PhysRevLett.99.182004

Measurement of the e+e- -->pi+pi- J/psi cross section via initial-state radiation at Belle

Phys Rev Lett. 2007 Nov 2;99(18):182004. doi: 10.1103/PhysRevLett.99.182004. Epub 2007 Nov 2.

Authors

C Z Yuan¹, C P Shen, P Wang, S McOnie, I Adachi, H Aihara, V Aulchenko, T Aushev, S Bahinipati, V Balagura, E Barberio, I Bedny, U Bitenc, A Bondar, A Bozek, M Bracko, J Brodzicka, T E Browder, M-C Chang, P Chang, A Chen, K-F Chen, W T Chen, B G Cheon, R Chistov, I-S Cho, Y Choi, J Dalseno, M Danilov, M Dash, S Eidelman, S Fratina, N Gabyshev, B Golob, H Ha, J Haba, K Hayasaka, H Hayashii, M Hazumi, D Heffernan, T Hokuue, Y Hoshi, W-S Hou, Y B Hsiung, H J Hyun, T Iijima, K Ikado, K Inami, A Ishikawa, R Itoh, Y Iwasaki, D H Kah, H Kaji, J H Kang, N Katayama, H Kawai, T Kawasaki, H Kichimi, Y J Kim, K Kinoshita, S Korpar, P Krizan, P Krokovny, R Kumar, C C Kuo, A Kuzmin, Y-J Kwon, S E Lee, T Lesiak, S-W Lin, Y Liu, D Liventsev, F Mandl, D Marlow, A Matyja, T Medvedeva, W Mitaroff, K Miyabayashi, H Miyake, H Miyata, Y Miyazaki, R Mizuk, T Mori, Y Nagasaka, M Nakao, Z Natkaniec, S Nishida, O Nitoh, S Ogawa, T Ohshima, S Okuno, S L Olsen, H Ozaki, P Pakhlov, G Pakhlova, H Palka, H Park, K S Park, L S Peak, L E Piilonen, Y Sakai, O Schneider, J Schümann, R Seidl, K Senyo, M E Sevior, M Shapkin, H Shibuya, J-G Shiu, B Shwartz, J B Singh, A Sokolov, A Somov, M Staric, T Sumiyoshi, F Takasaki, M Tanaka, G N Taylor, Y Teramoto, I Tikhomirov, S Uehara, Y Unno, S Uno, Y Usov, G Varner, K E Varvell, K Vervink, S Villa, A Vinokurova, C C Wang, C H Wang, X L Wang, Y Watanabe, E Won, B D Yabsley, A Yamaguchi, Y Yamashita, C C Zhang, Z P Zhang, V Zhilich, V Zhulanov, A Zupanc; Belle Collaboration

Affiliation

¹ Institute of High Energy Physics, Chinese Academy of Sciences, Beijing.

PMID: 17995399
DOI: 10.1103/PhysRevLett.99.182004

Abstract

The cross section for e(+)e(-)-->pi(+)pi(-)J/psi between 3.8 and 5.5 GeV/c(2) is measured using a 548 fb(-1) data sample collected on or near the Upsilon(4S) resonance with the Belle detector at KEKB. A peak near 4.25 GeV/c(2), corresponding to the so called Y(4260), is observed. In addition, there is another cluster of events at around 4.05 GeV/c(2). A fit using two interfering Breit-Wigner shapes describes the data better than one that uses only the Y(4260), especially for the lower-mass side of the 4.25 GeV enhancement.