# Mini-workshop on “$T_{cc}^+$ and beyond”, Online

Europe/Zurich
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Description

The workshop is dedicated to discussion on the recent observation of the exotic doubly charmed tetraquark $T_{cc}^+$.   The main purpose of the workshop is to summarize our current knowledge, both experimental and theoretical, on double heavy tetraquark system, including the properties of the $T_{cc}^+$ tetraquark and  discuss the next steps.

The workshop is scheduled at the same date after the CERN LHC seminar, where the observation of the $T_{cc}^+$  tetraquark and measurement of its properties  is reported.

Due to COVID-19, workshop is purely virtual, on-line only

ZOOM Meeting ID: 62186302872

Videoconference
Mini-workshop on “Tcc+ and beyond”, Online
Zoom Meeting ID
62186302872
Host
LHCb Secretariat
Alternative hosts
Giovanni Cavallero, Vanya Belyaev, Liupan An
Passcode
90385253
Join via phone
Zoom URL
• 1:00 PM 1:05 PM
Welcome 5m
• 1:05 PM 1:30 PM
$T_{cc}^+$: now + next steps 25m
Speaker: Vanya Belyaev (NRC "Kurchatov Institute" (ITEP) (RU))
• 1:30 PM 2:00 PM
Beyond $T_{cc}^+$ : $T_{bb}$, $T_{bc}$, ... 30m
Speaker: Steven R. Blusk (Syracuse University (US))
• 2:00 PM 2:20 PM
What can we learn from the width of the $T_{cc}^+$ tetraquark? 20m

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.

Speaker: Mitja Rosina
• 2:20 PM 2:50 PM
$T_{cc}^+$ and its cousins 30m
Speaker: Marek Karliner
• 2:50 PM 3:20 PM
Triangle singularities in the production of $T_{cc}^+$ and a soft pion 30m
Speaker: Eric Braaten
• 3:20 PM 3:40 PM
Coffee/tea break 20m
• 3:40 PM 4:10 PM
Generality of near-threshold structures and a survey of hidden-charm and double-charm hadronic molecules 30m
Speaker: Feng-Kun Guo (Insitute of Theoretical Physics, Chinese Academy of Sciences)
• 4:10 PM 4:30 PM
Heavy tetraquark states from Lattice QCD 20m
Speaker: Nilmani Mathur
• 4:30 PM 4:50 PM
$T_{cc}$ and its heavier cousins: Structure and binding in lattice QCD 20m
Speakers: Anthony Sebastian Francis (Universitaet Bern (CH)) , Randy Lewis (York University)
• 4:50 PM 5:20 PM
Some reflections on tetraquarks and molecules 30m
Speakers: Antonio Polosa (Sapienza Universita e INFN, Roma I (IT)) , Antonio Polosa (Universita' La Sapienza, Roma - Italy)
• 5:20 PM 5:40 PM
Stability of the double-heavy tetraquark: lessons from atomic physics 20m
Speakers: Jean-Marc Rene Richard (Centre National de la Recherche Scientifique (FR)) , jean-marc Richard (IPNL)
• 5:40 PM 5:50 PM
Closing remarks 10m
Speaker: Marco Pappagallo (Universita e INFN, Bari (IT))