2019/12/06 by Qiuhong Wang, Q. Wang, Wang, Q. +14
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Physics of Superconductivity and Magnetism #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.1912.02944
Proceeding of the XVIII International Conference on Hadron Spectroscopy and Structure (HADRON-2019), August 16-21, Guilin, China
arxiv created 2019/12/06 · openalex publication_date 2019/12/06 · arxiv updated 2019/12/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Numerous exotic candidates containing a heavy quark and anti-quark (the so-called XYZ states) have been reported since the observation of the X(3872) in 2003. For these systems a study of the implications of the heavy quark spin symmetry and its breaking is expected to provide useful guidance towards a better understanding of their nature. For instance, since the formation of the complete spin multiplets is described with the same parameter sets, in some cases the currently available experimental data on the XYZ states allows us to predict properties of spin partner states. To illustrate this point we extract the parameters of the two Zb states by analyzing the most recent experimental data within an effective-field theory approach which treats both short-ranged contact interactions and the long-ranged one-pion/one-eta Goldstone boson exchanges (OPE/OEE) dynamically. The line shapes and pole positions of their spin partners are then predicted in a parameter-free way and await to be tested by future experimental data.