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We have investigated the process of $\Lambda_b\to \Lambda D\bar{D}$, bytaking into account the contributions from the $s$-wave $D\bar{D}$ interactionwithin the coupled-channel unitary approach, and the intermediate $\psi(3770)$resonance. In addition to the peak of the $\psi(3770)$, an enhancement near the$D\bar{D}$ mass threshold is found in the $D\bar{D}$ invariant massdistributions, which should be the reflection of the $D\bar{D}$ bound state. Wewould like to encourage our experimental colleagues to measure the $D\bar{D}$invariant mass distribution of the $\Lambda_b\to \Lambda D\bar{D}$ process,which is crucial to search for the $D\bar{D}$ bound state and to understand theheavy-hadron heavy-hadron interactions.

Search for a $D \bar{D}$ bound state in the $\Lambda_b \rightarrow \Lambda D\bar{D}$ process