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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
ZOOM Password: 90385253
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.