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Structure of the X(1835) baryonium

Abstract : The measurement by the BES collaboration of J/psi -> gamma p pbar decays indicates an enhancement at the p-pbar threshold. In another experiment BES finds a peak in the invariant mass of pi-mesons produced in the possibly related decay J/psi -> gamma pi+ pi- eta'. Using a semi-phenomenological potential model which describes all the N-Nbar scattering data, we show that the explanation of both effects may be given by a broad quasi-bound state in the spin and isospin singlet S wave. The structure of the observed peak is due to an interference of this quasi-bound state with a background amplitude and depends on the annihilation mechanism.
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Contributor : Benoit Loiseau <>
Submitted on : Monday, February 22, 2010 - 5:52:02 PM
Last modification on : Thursday, December 10, 2020 - 12:31:48 PM

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J.-P. Dedonder, B. Loiseau, B. El-Bennich, S. Wycech. Structure of the X(1835) baryonium. Physical Review C, American Physical Society, 2009, 80, pp.045207. ⟨10.1103/PhysRevC.80.045207⟩. ⟨in2p3-00458948⟩

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