Welcome

$T_{cc}^+$: now + next steps

• Vanya Belyaev (NRC "Kurchatov Institute" (ITEP) (RU))

Beyond $T_{cc}^+$ : $T_{bb}$, $T_{bc}$, ...

• Steven R. Blusk (Syracuse University (US))

What can we learn from the width of the $T_{cc}^+$ tetraquark?

• Mitja Rosina

The width of the $T_{cc}^+$ tetraquark (dimeson) is expected to differ considerably from the widths of its constituent $D^{*0}$ and $D^{*+}$. Unfortunately, reliable values of the $D^{*0}$ and $T_{cc}^+$ widths are not yet known and at least theoretical estimates would be welcome. An interesting effect is due to the charge splitting of the $(D^{*+})D^0$ and $(D^{*0})D^+$ thresholds, therefore $T_{cc}^+$ will not have a pure isospin coupling $T_{cc}^+ = [(D^{*+})D^0 - (D^{*0})D^+]/\sqrt{2}$ and the actual composition may be seen in branching ratios. The width of $T_{cc}^+$ may depend strongly on threshold effects since its energy is not discrete and its peak extends beyond the lowest threshold, making it partially unstable and therefore broader. I shal try to estimate some of these effects.

$T_{cc}^+$ and its cousins

• Marek Karliner

Triangle singularities in the production of $T_{cc}^+$ and a soft pion

• Eric Braaten

Generality of near-threshold structures and a survey of hidden-charm and double-charm hadronic molecules

• Feng-Kun Guo (Insitute of Theoretical Physics, Chinese Academy of Sciences)

Heavy tetraquark states from Lattice QCD

• Nilmani Mathur

$T_{cc}$ and its heavier cousins: Structure and binding in lattice QCD

• Randy Lewis (York University)
• Anthony Sebastian Francis (Universitaet Bern (CH))

Some reflections on tetraquarks and molecules

• Antonio Polosa (Sapienza Universita e INFN, Roma I (IT))
• Antonio Polosa (Universita' La Sapienza, Roma - Italy)

Stability of the double-heavy tetraquark: lessons from atomic physics

• Jean-Marc Rene Richard (Centre National de la Recherche Scientifique (FR))
• jean-marc Richard (IPNL)

Closing remarks

• Marco Pappagallo (Universita e INFN, Bari (IT))