Abstract
Large data amount, about 1 ab−1 of integrated luminosity, collected in experiments with the Belle detector provided a good possibilities for precise measurements of the hadronic cross sections in e+e− annihilation. Main results obtained in this field with the Belle detector as well as perspectives of the new experiments with the Belle II detector at the SuperKEKB collider is discussed in this report.
Highlights
Experiments at the KEKB e+e− energy-asymmetric collider [1] with world highest luminosity, 2.1 × 1034cm−2s−1, continued with the Belle detector [2] from 1999 to 2010
The total cross sections of e+e− → bband e+e− → ΥnS π+π−(n = 1, 2, 3) processes were measured by the Belle collaboration in the energy range from 10.63 to 11.05 GeV using the direct high luminosity energy scan [4]
The Rc experimental values obtained by summing of the cross sections measured by the Belle experiment [20] in comparison with BES III results [21] are presented in the Fig. 2
Summary
Experiments at the KEKB e+e− energy-asymmetric collider [1] with world highest luminosity, 2.1 × 1034cm−2s−1, continued with the Belle detector [2] from 1999 to 2010. The main target of the Belle experiment was to discover the CP-violation (CPV) in B meson decays and to measure its parameters. In addition to the main task, many other important results listed below were obtained, including precise measurement of the hadronic cross sections in γγ and e+e− processes. This wide researches area became possible due to the clean and well defined initial state in the e+e− experiments as well as large KEKB luminosity and high quality of the Belle detector. Precise measurements of the total cross sections of the e+e− annihilation into hadrons and detail study the final states produce important information about quark interactions, spectroscopy of their bound states and provide a basis for the calculations of the hadronic contributions to the fundamental parameters, like muon (g − 2) value or α(MZ2)
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