Hadron spectroscopy, the study of states bound by the strong interaction, has received renewed interest in recent years, motivated by the discovery of states that to not conform to the usual classification of mesons (q qbar) or baryons (qqq). This opens up a new field of spectroscopy for these unconventional states. In this talk I will give a short overview of the field and present several...
Studying the spectroscopy of hadrons from lattice QCD, much like in experiment, involves determining hadronic scattering amplitudes and investigating enhancements due to resonances. Lattice QCD offers a method for first-principles computation of hadronic scattering amplitudes and thus enables resonance properties to be determined directly from the fundamental theory. I will present several...
The LHCb collaboration recently discovered a doubly charmed tetraquark $T_{cc}$ with flavor $cc\bar u\bar d$ just $0.36(4)~$MeV below $D^0D^{*+}$ threshold. This is the longest lived hadron with explicitly exotic quark content known to this date. We present the first lattice QCD study of $DD^*$ scattering in this channel, involving rigorous determination of pole singularities in the related...
Based on a sample of 448 million psi(2S) events and a scan data sample above 3.7 GeV with an integrated luminosity of 22/fb, charmonium spectroscopy and decays are studied. In the talk the latest results will be presented. The production of psi2(3823) via e+e- -> pi+ pi- psi2(3823) is measured, the most precise measurement of the mass of psi2(3823) is achieved, and the new decay modes of...
