Hong-Shen Li | Searcharxiv

arXiv2021

Analysis of the $ \boldsymbol{γγ\to D\bar D}$ reaction and the $D\bar{D}$ bound state

In this work, we investigate the reaction of $γγ\to D\bar{D}$, taking into account the s-wave $D\bar{D}$ final state interaction. By fitting to the $D\bar{D}$ invariant mass distributions measured by the Belle and BaBar Collaborations, we obtain a good reproduction of the data by means of a $D\bar{D}$ amplitude that produces a bound $D\bar{D}$ state with $I=0$ close to threshold. The error bands of the fits indicate, however, that more precise data on this reaction are needed to be more assertive about the position and width of such state.

hep-ph↗

arXiv2021

Search for a $D \bar{D}$ bound state in the $Λ_b \rightarrow ΛD\bar{D}$ process

We have investigated the process of $Λ_b\to ΛD\bar{D}$, by taking into account the contributions from the $s$-wave $D\bar{D}$ interaction within the coupled-channel unitary approach, and the intermediate $ψ(3770)$ resonance. In addition to the peak of the $ψ(3770)$, an enhancement near the $D\bar{D}$ mass threshold is found in the $D\bar{D}$ invariant mass distributions, which should be the reflection of the $D\bar{D}$ bound state. We would like to encourage our experimental colleagues to measure the $D\bar{D}$ invariant mass distribution of the $Λ_b\to ΛD\bar{D}$ process, which is crucial to search for the $D\bar{D}$ bound state and to understand the heavy-hadron heavy-hadron interactions.

hep-ph↗