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We report on an updated Paris NN optical potential. The long-and intermediate-range real parts are obtained by G-parity transformation of the Paris N N potential based on a theoretical dispersionrelation treatment of the correlated and uncorrelated two-pion exchange. The short-range imaginary potential parametrization results from the calculation of the NN annihilation box diagram into two mesons with a nucleon-antinucleon intermediate state in the crossed channel. The parametrized real and imaginary short range parts are determined by fitting not only the existing experimental data included in the 1999 version of the Paris NN potential, but also the recent antiprotonic-hydrogen data andnp total cross sections. The description of these new observables is improved. Only this readjusted potential generates an isospin zero 1 S0, 52 MeV broad quasibound state at 4.8 MeV below the threshold. Recent BES data on J/ψ decays could support the existence of such a state.
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