Observation of two resonant structures in e e-→π π-ψ(2S) via initial-state radiation at Belle

XL Wang; CZ Yuan; CP Shen; P Wang; I Adachi; H Aihara; K Arinstein; T Aushev; AM Bakich; E Barberio; I Bedny; V Bhardwaj; U Bitenc; S Blyth; A Bondar; A Bozek; M Bračko; J Brodzicka; TE Browder; P Chang; A Chen; KF Chen; BG Cheon; CC Chiang; R Chistov; IS Cho; SK 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; WS Hou; HJ Hyun; T Iijima; K Inami; A Ishikawa; H Ishino; R Itoh; Y Iwasaki; DH Kah; JH Kang; H Kawai; T Kawasaki; H Kichimi; HO Kim; SK Kim; YJ Kim; K Kinoshita; S Korpar; P Križan; P Krokovny; R Kumar; CC Kuo; A Kuzmin; JS Lange; JS Lee; MJ Lee; SE Lee; T Lesiak; A Limosani; SW 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; SL Olsen; H Ozaki; P Pakhlov; G Pakhlova; H Palka; CW Park; H Park

Journal article

Observation of two resonant structures in e e-→π π-ψ(2S) via initial-state radiation at Belle

XL Wang, CZ Yuan, CP Shen, P Wang, I Adachi, H Aihara, K Arinstein, T Aushev, AM Bakich, E Barberio, I Bedny, V Bhardwaj, U Bitenc, S Blyth, A Bondar, A Bozek, M Bračko, J Brodzicka, TE Browder, P Chang Show all

Physical Review Letters | Published : 2007

DOI: 10.1103/PhysRevLett.99.142002

Abstract

The cross section for e+e-→π+π-ψ(2S) between threshold and s=5.5GeV is measured using 673fb-1 of data on and off the Υ(4S) resonance collected with the Belle detector at KEKB. Two resonant structures are observed in the π+π-ψ(2S) invariant-mass distribution, one at 4361±9±9MeV/c2 with a width of 74±15±10MeV/c2, and another at 4664±11±5MeV/c2 with a width of 48±15± 3MeV/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. © 2007 The American Physical Society.