Recent Charmonium Results from BES (Talk Presented at DPF99)

F. A. Harris

Recent Charmonium Results from BES (Talk Presented at DPF99)

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arxiv hep-ex/9903036 v2 pith:YTJ5BV2N submitted 1999-03-17 hep-ex

F. A. Harris This is my paper · ORCID

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Recent results obtained from the BES psi(2S) data are summarized, including the measurement of the branching ratio of the J/psi to leptons, B(J/psi -> l^+ l^-) = 5.87 +/- 0.04 +/- 0.09, many psi(2S) and chi_c branching ratios, information on the rho-pi puzzle, and measurements of the mass of the chi_c0, m(chi_c0) = 3414.1 +/- 0.6 +/- 0.8 MeV, and the eta_c, m(eta_c) = 2975.8 +/- 3.9 +/- 1.2 MeV.

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Unquenched Charmonium and Beyond
hep-ph 2026-02 conditional novelty 2.0 of 10

This Lanzhou-group review argues that coupled-channel (unquenched) effects, not exotic constituents, are the common thread explaining charmonium anomalies from the rho-pi puzzle to the Y-problem states.

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