Highlights and Prospects of Hadron Spectroscopy at e+e- Colliders

A striking discovery in the last years was the observation of particles decaying into a heavy quarkonium and a charged pion. These objects must contain four quarks. The breakthrough come in 2013 when a narrow charmonium-like structure Z_c(3900) was observed and confirmed by BESIII, Belle and CLEOc experiments. I will review a recent progress concerning XYZ states in the charm sector with focus on BESIII contribution where new neutral vector Y_c states were observed last year, as well as new Z_c candidates. BESIII experiment is located at Beijing Electron-Positron Collider II covering charm region with centre-of-mass energies from 2 GeV to 4.6 GeV. I will also discuss prospects of using spin entangled hyperon-antihyperon pairs from J/ψ and ψ(3868) produced in e⁺e^- collisions for determination of hyperon decay parameters and for CP symmetry tests in baryon sector.

All interested persons are invited.
Coffee and tea will be served in the lecture hall half an hour before the colloquium.
Stanisław Mrówczyński, Włodzimierz Piechocki