Measurement of the e e-→π π-J/ψ cross section via initial-state radiation at Belle

CZ Yuan; CP 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 Bračko; J Brodzicka; TE Browder; MC Chang; P Chang; A Chen; KF Chen; WT Chen; BG Cheon; R Chistov; IS 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; WS Hou; YB Hsiung; HJ Hyun; T Iijima; K Ikado; K Inami; A Ishikawa; R Itoh; Y Iwasaki; DH Kah; H Kaji; JH Kang; N Katayama; H Kawai; T Kawasaki; H Kichimi; YJ Kim; K Kinoshita; S Korpar; P Križan; P Krokovny; R Kumar; CC Kuo; A Kuzmin; YJ Kwon; SE Lee; T Lesiak; SW 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; SL Olsen; H Ozaki; P Pakhlov; G Pakhlova; H Palka; H Park; KS Park; LS Peak; LE Piilonen

Journal article

Measurement of the e e-→π π-J/ψ cross section via initial-state radiation at Belle

CZ Yuan, CP 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 Bračko, J Brodzicka, TE Browder, MC Chang, P Chang Show all

Physical Review Letters | Published : 2007

DOI: 10.1103/PhysRevLett.99.182004

Abstract

The cross section for e+e-→π+π-J/ψ between 3.8 and 5.5GeV/c2 is measured using a 548fb-1 data sample collected on or near the Υ(4S) resonance with the Belle detector at KEKB. A peak near 4.25GeV/c2, corresponding to the so called Y(4260), is observed. In addition, there is another cluster of events at around 4.05GeV/c2. 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. © 2007 The American Physical Society.