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Observation of two resonant structures in e+ e- -->pi+ pi- psi(2S) via initial-state radiation at Belle |
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| Authors: | Wang X L Yuan C Z Shen C P Wang P Adachi I Aihara H Arinstein K Aushev T Bakich A M Barberio E Bedny I Bhardwaj V Bitenc U Blyth S Bondar A Bozek A Bracko M Brodzicka J Browder T E Chang P Chen A Chen K-F Cheon B G Chiang C-C Chistov R Cho I-S Choi S-K Choi Y Dalseno J Danilov M Dash M Drutskoy A Eidelman S Epifanov D Gabyshev N Go A Gokhroo G Ha H Hayasaka K Hayashii H Hazumi M Heffernan D Hoshi Y Hou W-S Hyun H J Iijima T Inami K Ishikawa A Ishino H Itoh R Iwasaki Y Kah D H Kang J H Kawai H Kawasaki T Kichimi H Kim H O Kim S K Kim Y J Kinoshita K Korpar S Krizan P Krokovny P Kumar R Kuo C C |
| Institution: | Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, PR China. |
| Abstract: | The cross section for e+ e- --> pi+ pi- psi(2S) between threshold and sqrts]=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. |
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