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Paris nucleon-antinucleon potential constrained by recent antiprotonic-atom data and antineutron-proton total cross sections

Abstract : We report on an updated optical Paris nucleon-antinucleon potential. The long- and intermediate-range parts are obtained by G-parity transformation of the Paris nucleon-nucleon potential based on a theoretical dispersion-relation treatment of the correlated and uncorrelated two-pion exchange. 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 nucleon-antinucleon potential, but also the recent antiprotonic-hydrogen data and antineutron-proton total cross sections. The description of the experimental observables is improved. Only this readjusted potential generates an isospin zero 1S0, 52 MeV broad quasi-bound state at 4.8 MeV below the threshold. Recent BES data on J/psi decays could support the existence of such a state.
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http://hal.in2p3.fr/in2p3-00358288
Contributor : Swarna Bassava <>
Submitted on : Tuesday, February 3, 2009 - 2:13:52 PM
Last modification on : Saturday, April 11, 2020 - 2:04:26 AM

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B. El-Bennich, M. Lacombe, B. Loiseau, S. Wycech. Paris nucleon-antinucleon potential constrained by recent antiprotonic-atom data and antineutron-proton total cross sections. Physical Review C, American Physical Society, 2008, 79, pp.5. ⟨10.1103/PhysRevC.79.054001⟩. ⟨in2p3-00358288⟩

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