Recent Belle results in quarkonium physics
Roman Mizuk (for the Belle Collaboration)
TL;DR
This paper reviews recent experimental results from Belle on quarkonium states, including precise measurements, evidence for new states, and transition observations, highlighting both agreement with theoretical predictions and unexpected high excitation behaviors.
Contribution
It provides a comprehensive summary of Belle's latest findings in quarkonium physics, including new state evidence and transition measurements, advancing experimental understanding in the field.
Findings
Precise eta_b(1S) parameters measured
Evidence for eta_b(2S) and psi_2(1D) states
Observation of high-rate transitions in quarkonium states
Abstract
We review selected recent Belle results in quarkonium physics, that include precision measurement of the eta_b(1S) parameters, evidence for the eta_b(2S); evidence for the psi_2(1D); observation of the psi(4040) and psi(4160) transitions to J/psi eta with anomalously high rates; observation of the Upsilon(5S) transitions to Upsilon(1D)pi+pi- and Upsilon(1S,2S)eta. The low excitations of charmonium and bottomonium are in agreement with the Lattice QCD and effective theories calculations, while high excitations show unexpected properties.
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