Abstract
Recent BESIII results on exotic hadron candidates, the heavy charmonium-like states, will be reviewed, as well as a short introductions to the BEPCII collider and the BEESIII detector. Future BESIII running plans, specially the physics program for the exotic hadron spectroscopy, will be discussed.
Highlights
Introduction of BESIII and BEPCIIThe Beijing Electron Positron Collider II(BEPCII) [1] is a double-ring e+e− collider with reached peak luminosity of 1033 cm−2 s−1 and beam current of 0.93 A in the τ-charm energy region
The BESIII detector [2], operating at the BEPCII collider, is a general purpose spectrometer with a geometrical acceptance of 93% of 4π stereo angle. It is composed by four main components: a multi-layer drift chamber (MDC) with a momentum resolution of 0.5% at 1.0 GeV/c in a 1.0 T magnetic field and a dE/dx resolution better than 6% at the minimum ionization energy, a time-of-flight (TOF) detector constructed of 5 cm thick plastic scintillators providing a 2σ K/π separation for momentum up to 1.0 GeV/c, an electromagnetic calorimeter (EMC) in a cylindrical barrel structure and two end-caps providing deposited energy measurement of photon with resolution 2.5% (5%) at 1.0 GeV in the barrel, and a muon counter (MUC) consisting of 1000 m2 resistive plate chambers (RPCs) in nine barrel and eight end-cap layers
More details of the BESIII detector can be found in Ref. [2]
Summary
The Beijing Electron Positron Collider II(BEPCII) [1] is a double-ring e+e− collider with reached peak luminosity of 1033 cm−2 s−1 and beam current of 0.93 A in the τ-charm energy region. The BESIII detector [2], operating at the BEPCII collider, is a general purpose spectrometer with a geometrical acceptance of 93% of 4π stereo angle. QCD allows states with more complex compositions such as penta-quark (five quarks), H-dibaryon (six quarks), tetraquark (four quarks), glueball, hybrid, molecule, etc., even not explicitly and definitely confirmed by experiments yet These new hadron forms are exotic hadrons, or called as XYZ particles. Since 2012, the BESIII collaboration has systematically investigated the charmonium-like XYZ particles and made many important measurements It will go on this exploration with more data accumulated in this energy region. I shall fast review the obtained exotic hadron results at BESIII so far, discuss what we know/what we don’t know but want to know, data taking plan for XYZ particle study at BESIII, and what can be expected in the near future
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