2013/04/30 by E. Wilbring, Erik Wilbring, H.‐W. Hammer +3 · 69 citations
Physics and Astronomy · #Algorithm #Charge (physics) #Computer science #Hadron #Nuclear physics research studies #Observable #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quarkonium #hep-ex #hep-ph #nucl-th
paper · pdf · doi:10.1016/j.physletb.2013.08.059
published in Physics Letters B 726(1-3), 326-329 (Elsevier BV) · 5 pages, 4 figures, final version to appear in Phys. Lett. B
openalex publication_date 2013/08/31 · arxiv created 2013/09/03 · arxiv updated 2014/01/20 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The observation of the exotic quarkonium state Zc(3900) by the BESIII and Belle collaborations supports the concept of hadronic molecules. Charmonium states interpreted as such molecules would be bound states of heavy particles with small binding energies. This motivates their description using an effective theory with contact interactions. In particular, we focus on the electromagnetic structure of the charged state Zc(3900). Using first experimental results concerning spin and parity, we interpret it as an S-wave molecule and calculate the form factors as well as charge and magnetic radii up to next-to-leading order. We also present first numerical estimations of some of these observables at leading order.