Role of the hadron moleculeΛc(2940)in thepp¯→pD0Λ¯c(2286)annihilation reaction

Abstract

The annihilation process $p\overline{p}\ensuremath{\rightarrow}p{D}^{0}{\overline{\mathrm{\ensuremath{\Lambda}}}}_{c}(2286)$ is studied taking into account $t$-channel ${D}^{0}$, ${D}^{*0}$ meson exchange and the resonance contribution of ${\mathrm{\ensuremath{\Lambda}}}_{c}(2286)$ and ${\mathrm{\ensuremath{\Lambda}}}_{c}(2940)$ baryons. We assume that the ${\mathrm{\ensuremath{\Lambda}}}_{c}(2940)$ baryon is a $p{D}^{*0}$ molecular state with spin-parity ${\frac{1}{2}}^{+}$ and ${\frac{1}{2}}^{\ensuremath{-}}$. Our results show that near the threshold of $p\overline{p}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Lambda}}}_{c}(2286){\overline{\mathrm{\ensuremath{\Lambda}}}}_{c}(2286)$ the contribution from the intermediate state ${\mathrm{\ensuremath{\Lambda}}}_{c}(2940)$ is also sizeable and can be observed at the $\overline{P}\mathrm{ANDA}$ experiment. Another conclusion is that the spin-parity assignment ${\frac{1}{2}}^{\ensuremath{-}}$ for ${\mathrm{\ensuremath{\Lambda}}}_{c}(2940)$ gives enhancement for the cross section in comparison with a choice ${\frac{1}{2}}^{+}$.