Study of N* production from J/psi -> p(p)over-bar eta

Citation
Jz. Bai et al., Study of N* production from J/psi -> p(p)over-bar eta, PHYS LETT B, 510(1-4), 2001, pp. 75-82
Citations number
27
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
0370-2693 → ACNP
Volume
510
Issue
1-4
Year of publication
2001
Pages
75 - 82
Database
ISI
SICI code
0370-2693(20010621)510:1-4<75:SONPFJ>2.0.ZU;2-J
Abstract
Data are presented on the reaction J/psi --> <p(p)over bar <eta>> using 7.8 x 10(6) J/psi triggers collected by the BEjing Spectrometer (BES). A parti al wave analysis is performed. A clear enhancement near the p eta((p) over bar eta) threshold is observed. It is fitted with a J(P) = 1/2(-) resonance with mass M = 1530 +/- 10 MeV and width Gamma = 95 +/- 25 MeV. In addition , there is a peak around 1650 MeV with J(P) = 1/2(-) preferred also, fitted with M = 1637 +/- 20 MeV and Gamma = 145(-45)(+80) MeV. These two N* reson ances are believed to be the two well established states, S-11(1535) and S- 11(1650). respectively. It is the first partial wave study of the productio n of these resonances from J/psi decays. (C) 2001 Published by Elsevier Sci ence B.V.