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

Giovanni Cavallero (CERN) , Liupan An (CERN) , Vanya Belyaev (NRC "Kurchatov Institute" (ITEP) (RU))

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. 

  1. LHCb-PAPER-2021-031, arXiv:2109.01038
  2. LHCb-PAPER-2021-032, arXiv:2109.01056

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

ZOOM Password: 90385253

ZOOM link


Mini-workshop on “Tcc+ and beyond”, Online
Zoom Meeting ID
LHCb Secretariat
Alternative hosts
Giovanni Cavallero, Vanya Belyaev, Liupan An
Useful links
Join via phone
Zoom URL
    • 1
    • 2
      $T_{cc}^+$: now + next steps
      Speaker: Vanya Belyaev (NRC "Kurchatov Institute" (ITEP) (RU))
    • 3
      Beyond $T_{cc}^+$ : $T_{bb}$, $T_{bc}$, ...
      Speaker: Steven R. Blusk (Syracuse University (US))
    • 4
      What can we learn from the width of the $T_{cc}^+$ tetraquark?

      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
    • 5
      $T_{cc}^+$ and its cousins
      Speaker: Marek Karliner
    • 6
      Triangle singularities in the production of $T_{cc}^+$ and a soft pion
      Speaker: Eric Braaten
    • 3:20 PM
      Coffee/tea break
    • 7
      Generality of near-threshold structures and a survey of hidden-charm and double-charm hadronic molecules
      Speaker: Feng-Kun Guo (Insitute of Theoretical Physics, Chinese Academy of Sciences)
    • 8
      Heavy tetraquark states from Lattice QCD
      Speaker: Nilmani Mathur
    • 9
      $T_{cc}$ and its heavier cousins: Structure and binding in lattice QCD
      Speakers: Anthony Sebastian Francis (Universitaet Bern (CH)) , Randy Lewis (York University)
    • 10
      Some reflections on tetraquarks and molecules
      Speakers: Antonio Polosa (Sapienza Universita e INFN, Roma I (IT)) , Antonio Polosa (Universita' La Sapienza, Roma - Italy)
    • 11
      Stability of the double-heavy tetraquark: lessons from atomic physics
      Speakers: Jean-Marc Rene Richard (Centre National de la Recherche Scientifique (FR)) , jean-marc Richard (IPNL)
    • 12
      Closing remarks
      Speaker: Marco Pappagallo (Universita e INFN, Bari (IT))