Discovery and study of the first double-charm tetraquark

by Mikhail Mikhasenko (CERN)

Tuesday 9 Nov 2021, 15:00 → 17:00 Europe/Berlin

Nußallee 14-16/0.023 (HISKP) - Lecture Hall (HISKP)

Conventional hadronic matter incorporates baryons and mesons made of three quarks and quark-antiquark pairs, respectively.

Hints for the exotic hadrons kept appearing since the discovery of unusual properties of X(3872) in 2003, as the charged charmonium-like states in 2013, and pentaquarks in 2015.

In the talk, I will discuss a new landmark discovery: an observation of the genuinely novel class of hadrons,  a doubly charmed tetraquark,

consisting of two charm quarks, an anti-u, and anti-d quark using data collected by the LHCb experiment at the Large Hadron Collider.

Details of the analysis and aspects of a few theoretical calculations anticipating the discovery for several decades will be reported.

2021-11-09_Tcc_mikhasenko.pdf