Abstract
With a collected integrated luminosity of about 12 fb−1, useful data set for XYZ new resonances, BESIII continues the exploration of these exotic charmonium-like states. In this proceeding, recent results on the measurements of the line-shape of e+e− → π+π−ψ(3868) and π+D0D*−, as well as the JP determination of ZC (3900) will be presented. An abundance of Y will be reported in several decay channels. Finally the present BESIII data above the ${e^ + }{e^ - }\, \to \,{\Lambda _C}{\bar \Lambda _C}$ threshold will be shortly discussed because they are barely in agreement with the current Belle data on the candidate charmed baryonium state Y(4660). A BEPCII upgrade, that will allow to settle this open question, has been funded.
Highlights
Strong interaction is one of the four fundamental forces and it acts on elementary particles such as quarks
In the last years two discoveries of interest have to be cited: the Z(3900) [1] discovered by BESIII is a tetraquark candidate and the P+c [2] discovered by LHCb is referred as pentaquark
Collaboration opened a new field of research to understand the nature of this particle. It has been observed in the decay channel e+e− → (J/ψπ+)π− and since it decays in charmonium plus a charged pion it should contain at least four quarks: a cc and a ud
Summary
Strong interaction is one of the four fundamental forces and it acts on elementary particles such as quarks. In the heavy meson sector, the potential model describes the bound states of charm and anti-charm quarks, called charmonium, and it can predict the mass and width of the bound state, e.g. ηc, ψ and χc particles as a function of its quantum number. The theoretical prediction of the potential model and the measured masses of the charmonium states are in agreement below the open charm threshold This energy it was expected to discover the excited states of the charmonium states but only a few have been measured and many others have not been found. The Z(3900) is the first evidence of a new kind of bound state that it is not neither a meson nor a baryon Those XYZ states have been labelled with different letters to define different behaviors: Y states have quantum number 1−− while Z states are connected to this possible tetraquark explanation.
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