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The kappa in J/Ψ↦K+π

Original Article

Abstract.

BES II data for J/Ψ↦K*(890)Kπ reveal a strong κ peak in the Kπ S-wave near threshold. Both magnitude and phase are determined in slices of Kπ mass by interferences with strong K0(1430), K1(1270) and K1(1400) signals. The phase variation with mass agrees within errors with LASS data for Kπ 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 κ pole is at (760±20(stat)±40(syst)) - i(420±45(stat)±60(syst)) MeV. The S-wave I = 0 scattering length a0 = 0.23±0.04 mπ-1 is close to the prediction 0.19±0.02 mπ-1 of Chiral Perturbation Theory at O(p4).

PACS.

13.25.Gv Decays of J/ψ, ϒ, and other quarkonia 14.40.Gx Mesons with S = C = B = 0, mass > 2.5 GeV (including quarkonia) 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2005

Authors and Affiliations

  1. 1.Queen MaryUniversity of LondonLondonUK

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