Effective range expansion for narrow near-threshold resonances
V. Baru, Xiang-Kun Dong, Meng-Lin Du, A. A. Filin, Feng-Kun Guo, C. Hanhart, A. V. Nefediev, J. Nieves, Qian Wang
Abstract
We discuss some general features of the effective range expansion, the content of its parameters with respect to the nature of the pertinent near-threshold states and the necessary modifications in the presence of coupled channels, isospin violations and unstable constituents. As illustrative examples, we analyse the properties of the χc1(3872) and Tcc+ states supporting the claim that these exotic states have a predominantly molecular nature.
Topics & Concepts
Range (aeronautics)IsospinPhysicsStatistical physicsParticle physicsMaterials scienceComposite materialQuantum Chromodynamics and Particle InteractionsQuantum chaos and dynamical systemsNuclear physics research studies