Abstract
We present a measurement of the Cabibbo-Kobayashi-Maskawa unitarity triangle angle ϕ3 (also known as γ) using a model-independent Dalitz plot analysis of B+ → D (\( {K}_S^0 \)h+h−)h+, where D is either a D0 or \( \overline{D} \)0 meson and h is either a π or K. This is the first measurement that simultaneously uses Belle and Belle II data, combining samples corresponding to integrated luminosities of 711 fb−1 and 128 fb−1, respectively. All data were accumulated from energy-asymmetric e+e− collisions at a centre-of-mass energy corresponding to the mass of the Υ(4S) resonance. We measure ϕ3 = (78.4 ± 11.4 ± 0.5 ± 1.0)°, where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is from the uncertainties on external measurements of the D-decay strong-phase parameters.
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07 December 2022
An Erratum to this paper has been published: https://doi.org/10.1007/JHEP12(2022)034
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The Belle and Belle II collaborations., Abudinén, F., Aggarwal, L. et al. Combined analysis of Belle and Belle II data to determine the CKM angle ϕ3 using B+ → D(\( {K}_S^0 \)h+h−)h+ decays. J. High Energ. Phys. 2022, 63 (2022). https://doi.org/10.1007/JHEP02(2022)063
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DOI: https://doi.org/10.1007/JHEP02(2022)063