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Advances in High Energy Physics
Volume 2019, Article ID 4651908, 6 pages
Research Article

Effective-Range-Expansion Study of Near Threshold Heavy-Flavor Resonances

1Department of Physics and Hebei Advanced Thin Films Laboratory, Hebei Normal University, Shijiazhuang 050024, China
2College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
3Departamento de Física, Universidad de Murcia, E-30071 Murcia, Spain

Correspondence should be addressed to Zhi-Hui Guo; nc.ude.utbeh@oughz

Received 26 December 2018; Revised 5 April 2019; Accepted 15 May 2019; Published 16 June 2019

Academic Editor: Burak Bilki

Copyright © 2019 Rui Gao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The publication of this article was funded by SCOAP3.


In this work, we study the resonances near the thresholds of the open heavy-flavor hadrons using the effective-range-expansion method. The unitarity, analyticity, and compositeness coefficient are also taken into account in our theoretical formalism. We consider the , , , , and . The scattering lengths and effective ranges from the relevant elastic -wave scattering amplitudes are determined. Tentative discussions on the inner structures of the aforementioned resonances are given.