Recent issues in heavy-light meson spectroscopy

Abstract

Then ew heavy-light mesons tates ared iscussed within ac onstituentquark model that provides with agood descriptionofthe rest of themeson and baryon spectra and also thebaryonbaryon phenomenology.All theser esonances areproperly describes if considered as amixtureof conventional quark-antiquarkstatesand four-quarkcomponents.When appliedtothe bottomsector, we findt hat thefour-quarkcomponents of some of thepositive parity B sJ mesonstates shift their massesb elow thec orresponding isospinp reservingt wo-meson thresholda nd thereforet heya re expected to have asmall decay width

Systematic Study of Hadronic Molecules in the Heavy-Quark Sector

“…Most prominently, a number of publications assume the states to be tetraquarks, i.e. compact states with four valence quarks [46][47][48][49][50]. Since some of their features are similar to the molecular picture it remains to point out features that make a distinction possible.…”