2024/09/10 by Ming-Zhu Liu, Shen, Yi-Bo, Zhiwei Liu +4
Physics and Astronomy · #Quantum Chromodynamics and Particle Interactions #Particle physics theoretical and experimental studies #Black Holes and Theoretical Physics
paper · pdf · doi:10.48550/arxiv.2409.06409
A recent analysis of the LHCb data [Phys. Rev. D 105 (2022) L031503] obtained a sizable negative effective range for the X(3872). This has attracted intensive discussions on whether X(3872) can be deemed as a DD^* molecular state. This work explicitly demonstrates that the negative effective range of the X(3872) does not contradict the molecular picture, adopting an effective field theory formulation of the DD^* interaction that can simultaneously reproduce the binding energy and effective range of the X(3872). We elaborate on the implications of the large negative effective range of X(3872) and the small binding energy on the underlying DD^* interaction. Such results are relevant for a better understanding of hadronic molecules and their binding mechanism.