The Kappa in J/Psi -> Kpplus-piminus-Kminus-piplus

Details The Kappa in J/Psi -> Kpplus-piminus-Kminus-piplus The Kappa in J/Psi -> Kpplus-piminus-Kminus-piplus

2005-10-09

arxiv.org/abs/hep-ex/0510026v1

Eur.Phys.J.A25:107-114,2005; Erratum-ibid.A26:151,2005

Physics

High Energy Physics

High Energy Physics - Experiment

20 pages, 5 figures

Scientific paper

10.1140/epja/i2005-10033-3

BES II data for J/Psi->K*(890)Kpi reveal a strong kappa peak in the Kpi S-wave near threshold. Both magnitude and phase are determined in slices of Kpi mass by interferences with strong Ko(1430), K1(1270) and K1(1400) signals. The phase variation with mass agrees within errors with LASS data for Kpi elastic scattering. A combined fit is presented to both BES and LASS data. The fit uses a Breit-Wigner amplitude with an s-dependent width containing an Adler zero. The kappa pole is at 760+-20(stat)+-40(syst) - i(420+-45+-60syst) MeV. The S-wave I=0 scattering length a_0 = 0.23+-0.04 (in units of m(pi)) is close to the prediction 0.19+-0.02 of Chiral Perturbation Theory.

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