Observation of two resonant structures in e+ e- -->pi+ pi- psi(2S) via initial-state radiation at Belle

X L Wang; C Z Yuan; C P Shen; P Wang; I Adachi; H Aihara; K Arinstein; T Aushev; A M Bakich; E Barberio; I Bedny; V Bhardwaj; U Bitenc; S Blyth; A Bondar; A Bozek; M Bracko; J Brodzicka; T E Browder; P Chang; A Chen; K-F Chen; B G Cheon; C-C Chiang; R Chistov; I-S Cho; S-K Choi; Y Choi; J Dalseno; M Danilov; M Dash; A Drutskoy; S Eidelman; D Epifanov; N Gabyshev; A Go; G Gokhroo; H Ha; K Hayasaka; H Hayashii; M Hazumi; D Heffernan; Y Hoshi; W-S Hou; H J Hyun; T Iijima; K Inami; A Ishikawa; H Ishino; R Itoh; Y Iwasaki; D H Kah; J H Kang; H Kawai; T Kawasaki; H Kichimi; H O Kim; S K Kim; Y J Kim; K Kinoshita; S Korpar; P Krizan; P Krokovny; R Kumar; C C Kuo; A Kuzmin; J S Lange; J S Lee; M J Lee; S E Lee; T Lesiak; A Limosani; S-W Lin; Y Liu; D Liventsev; F Mandl; S McOnie; T Medvedeva; K Miyabayashi; H Miyake; H Miyata; R Mizuk; T Mori; E Nakano; M Nakao; H Nakazawa; Z Natkaniec; S Nishida; O Nitoh; S Noguchi; S Ogawa; T Ohshima; S Okuno; S L Olsen; H Ozaki; P Pakhlov; G Pakhlova; H Palka; C W Park; H Park; K S Park; R Pestotnik; L E Piilonen; A Poluektov; H Sahoo; Y Sakai; O Schneider; A Sekiya; M E Sevior; M Shapkin; H Shibuya; J-G Shiu; B Shwartz; J B Singh; A Sokolov; A Somov; S Stanic; M Staric; T Sumiyoshi; F Takasaki; K Tamai; M Tanaka; G N Taylor; Y Teramoto; I Tikhomirov; S Uehara; K Ueno; T Uglov; Y Unno; S Uno; P Urquijo; G Varner; S Villa; A Vinokurova; C C Wang; C H Wang; Y Watanabe; E Won; B D Yabsley; A Yamaguchi; Y Yamashita; M Yamauchi; C C Zhang; Z P Zhang; V Zhilich; V Zhulanov; A Zupanc; Belle Collaboration

doi:10.1103/PhysRevLett.99.142002

Observation of two resonant structures in e+ e- -->pi+ pi- psi(2S) via initial-state radiation at Belle

Phys Rev Lett. 2007 Oct 5;99(14):142002. doi: 10.1103/PhysRevLett.99.142002. Epub 2007 Oct 1.

Authors

X L Wang¹, C Z Yuan, C P Shen, P Wang, I Adachi, H Aihara, K Arinstein, T Aushev, A M Bakich, E Barberio, I Bedny, V Bhardwaj, U Bitenc, S Blyth, A Bondar, A Bozek, M Bracko, J Brodzicka, T E Browder, P Chang, A Chen, K-F Chen, B G Cheon, C-C Chiang, R Chistov, I-S Cho, S-K Choi, Y Choi, J Dalseno, M Danilov, M Dash, A Drutskoy, S Eidelman, D Epifanov, N Gabyshev, A Go, G Gokhroo, H Ha, K Hayasaka, H Hayashii, M Hazumi, D Heffernan, Y Hoshi, W-S Hou, H J Hyun, T Iijima, K Inami, A Ishikawa, H Ishino, R Itoh, Y Iwasaki, D H Kah, J H Kang, H Kawai, T Kawasaki, H Kichimi, H O Kim, S K Kim, Y J Kim, K Kinoshita, S Korpar, P Krizan, P Krokovny, R Kumar, C C Kuo, A Kuzmin, J S Lange, J S Lee, M J Lee, S E Lee, T Lesiak, A Limosani, S-W Lin, Y Liu, D Liventsev, F Mandl, S McOnie, T Medvedeva, K Miyabayashi, H Miyake, H Miyata, R Mizuk, T Mori, E Nakano, M Nakao, H Nakazawa, Z Natkaniec, S Nishida, O Nitoh, S Noguchi, S Ogawa, T Ohshima, S Okuno, S L Olsen, H Ozaki, P Pakhlov, G Pakhlova, H Palka, C W Park, H Park, K S Park, R Pestotnik, L E Piilonen, A Poluektov, H Sahoo, Y Sakai, O Schneider, A Sekiya, M E Sevior, M Shapkin, H Shibuya, J-G Shiu, B Shwartz, J B Singh, A Sokolov, A Somov, S Stanic, M Staric, T Sumiyoshi, F Takasaki, K Tamai, M Tanaka, G N Taylor, Y Teramoto, I Tikhomirov, S Uehara, K Ueno, T Uglov, Y Unno, S Uno, P Urquijo, G Varner, S Villa, A Vinokurova, C C Wang, C H Wang, Y Watanabe, E Won, B D Yabsley, A Yamaguchi, Y Yamashita, M Yamauchi, 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, PR China.

PMID: 17930661
DOI: 10.1103/PhysRevLett.99.142002

Abstract

The cross section for e+ e- --> pi+ pi- psi(2S) between threshold and sqrt[s]=5.5 GeV is measured using 673 fb(-1) of data on and off the Upsilon(4S) resonance collected with the Belle detector at KEKB. Two resonant structures are observed in the pi+ pi- psi(2S) invariant-mass distribution, one at 4361 +/- 9 +/- 9 MeV/c2 with a width of 74 +/- 15 +/- 10 MeV/c2, and another at 4664 +/- 11 +/- 5 MeV/c2 with a width of 48 +/- 15 +/- 3 MeV/c2, if the mass spectrum is parametrized with the coherent sum of two Breit-Wigner functions. These values do not match those of any of the known charmonium states.