Abstract
Many exotic hadronic states beyond the conventional quark model (called char-moniumlike/bottomoniumlike states or XYZ particles) were found in the B -factories or energy scans of the cross sections of e + e − annhilation into conventional quarkonia and light hadrons. Their nature properties were proposed including glueballs, hybrids, multi-quark states, hadron molecules, etc. Dramatic progress was made in the study of the them after the running of the B -factories. In this report, I present the most recent results on the XYZ results from Belle experiment.
Highlights
During the past thirteen years many exotic states decaying into conventional quarkonia and light hadrons, the so-called “XYZ" particles, have been reported in many different reactions [1]
They correspond to high excitations and have masses above the DDor BBthresholds
After the charged charmoniumlike state Zc(3900) was observed by BESIII and Belle experiments [14, 22] BESIII and Belle observed a series of charged Zc states including Zc(4020) [19], Zc(4200) [23], and Zc(3885) [24]
Summary
During the past thirteen years many exotic states decaying into conventional quarkonia and light hadrons, the so-called “XYZ" particles, have been reported in many different reactions [1]. They correspond to high excitations and have masses above the DDor BBthresholds. Most cannot be described well by quarkonium potential models [1,2,3] Their unusual properties have stimulated considerable theoretical interest and various interpretations have been proposed, including tetraquarks, molecules, hybrids, or hadrocharmonia [1, 3, 4]. I present the most recent results on the study of the XYZ states from the Belle experiment
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