Abstract
A near threshold enhancement in the $p\overline{p}$ invariant mass spectrum has been reported by the BELLE, BES, and BABAR collaborations for several $B$ and $J/\ensuremath{\psi}$ decays. This enhancement has been interpreted as a narrow baryonium state $X(1835)$. We investigate its nature using a $p\overline{p}$ interaction derived from a constituent quark model. This interaction does not show any $p\overline{p}$ bound state but a $^{3}P_{0}$ resonance. We show that $p\overline{p}$ final state interaction can reproduce the mass dependence of the $p\overline{p}$ mass spectrum close to the threshold observed in different $B$ and $J/\ensuremath{\psi}$ decays.
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