Search For A D(D)Over-Bar Bound State In The Lambda(B) -> Lambda D(D)Over-Bar Process

We investigate the process of Lambda b ->Lambda D (D) over bar, by taking into account the contributions from the s-wave D (D) over bar interaction within 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 (D) over bar mass threshold is found in the D (D) over bar invariant mass distributions, which should be the reflection of the D (D) over bar bound state. We encourage our experimental colleagues to measure the D (D) over bar invariant mass distribution of the Lambda b ->Lambda D (D) over bar process, which is crucial to search for the D (D) over bar bound state and to understand the heavy-hadron heavy-hadron interactions.