Abstract
In this contribution we review recent results from the BESIII experiment. We focus on the investigation of XYZ states and the discovery of new charged charmonium - like structures. Two isospin triplets Z(3900) and Z(4020) have been discovered, decaying into π± J/ψ and π± hc, respectively. Structures with compatible parameters have been found decaying to DD̄∗ and D∗D̄∗, respectively, suggesting that these structures might be of the same origin. Furthermore, we have investigated the transition Y(4260) → γX(3872). This is the first observation of a radiative transition between XYZ states.
Highlights
Hadrons are fundamental states bound by the strong interaction
The BESIII experiment[5] is located at the BEPC√II e+e− collider at the Institute of High Energy Physics (IHEP) Beijing
It should be noted that BESIII has a very rich physics program, including light hadron spectroscopy, charmonium physics, open charm physics, τ lepton physics, precision measurement of the R value and other topics that are not covered in this contribution
Summary
Hadrons are fundamental states bound by the strong interaction. Until recently, only two classes of hadrons were firmly established experimentally: baryons (anti-baryons), consisting of 3 quarks (anti-quarks) and mesons, consisting of quark / antiquark combinations. The spectroscopy of these states can be well described by various theoretical approaches such as static potential models, effective field theories and lattice QCD. Since 2003, many new unpredicted states have been found with properties that are not consistent with those of conventional charmonium states These states were called XYZ states since their nature is not understood and the existing naming scheme for mesons is not appropriate. If they exist, must contain at least two quarks and two anti-quarks, among them a ccpair All these these states have peculiar properties and do not fit into the established spectroscopy above the open charm threshold. We will focus on recent results on XYZ states from BESIII including the discovery of new charged charmonium - like structures Z(3900) and Z(4020) as well as their neutral partners. We exploit the fact that BESIII can populate the exotic 1−− Y states directly via e+e− annihilation into a virtual photon
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