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October 8, 2026
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The 23rd Annual Meeting of the Valdai Discussion Club was held from September 28 to October 1, 2026 under the theme ‘Responsibility for the Future: Limits of the Possible, or Limitless Possibilities?’ The forum brought together 120 experts from 40 countries, including representatives of China, the United States, India, Brazil, the United Kingdom, Germany, Egypt, Iran, and Japan.
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Measurement of time-dependent CP violation parameters in B 0 → KS0π 0γ decays at Belle and Belle II

Journal of High Energy Physics. 2026. Vol. 09. No. 216.
Bodrov D., Pakhlova G., Uglov T., Abumusabh М., Aushev Т.

We perform a measurement of time-dependent CP violation parameters in B0 -> KS0 pi0 gamma decays using a dataset of approximately 772 x 10^6 and 521 x 10^6 Upsilon(4S) decays collected by the Belle and Belle II experiments, respectively. The measured parameters for the combined dataset in the K0(892) dominated region (M_KS0pi0 in [0.8, 1.0] GeV/c^2) are S = 0.09 +/- 0.16 +/- 0.02 and C = -0.09 +/- 0.08 +/- 0.04. For the non-K0(892) region (M_KS0pi0 in (1.0, 1.8] GeV/c^2), the corresponding values are S = -0.32 +/- 0.33 +/- 0.09 and C = -0.07 +/- 0.17 +/- 0.08. The first quoted uncertainties are statistical, while the second ones are systematic. These results are consistent with Standard Model predictions and more precise than previous measurements.

Research target: Physics
Language: English
Full text
DOI
Keywords: Flavour Changing Neutral Currentse+ -e− Experiments
Publication based on the results of:
Search for New physics in the experiments on e+e- colliders (2025)
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