In:
Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2024, No. 5 ( 2024-05-17)
Abstract:
We report results from a study of B ± → DK ± decays followed by D decaying to the CP -even final state K + K − and CP-odd final state $$ {K}_S^0{\pi}^0 $$ K S 0 π 0 , where D is an admixture of D 0 and $$ {\overline{D}}^0 $$ D ¯ 0 states. These decays are sensitive to the Cabibbo-Kobayashi-Maskawa unitarity-triangle angle ϕ 3 . The results are based on a combined analysis of the final data set of 772 × 10 6 $$ B\overline{B} $$ B B ¯ pairs collected by the Belle experiment and a data set of 198 × 10 6 $$ B\overline{B} $$ B B ¯ pairs collected by the Belle II experiment, both in electron-positron collisions at the Υ(4 S ) resonance. We measure the CP asymmetries to be $$ \mathcal{A} $$ A CP + = (+12.5 ± 5.8 ± 1.4)% and $$ \mathcal{A} $$ A CP− = ( − 16.7 ± 5.7 ± 0.6)%, and the ratios of branching fractions to be $$ \mathcal{R} $$ R CP + = 1.164 ± 0.081 ± 0.036 and $$ \mathcal{R} $$ R CP− = 1.151 ± 0.074 ± 0.019. The first contribution to the uncertainties is statistical, and the second is systematic. The asymmetries $$ \mathcal{A} $$ A CP + and $$ \mathcal{A} $$ A CP− have similar magnitudes and opposite signs; their difference corresponds to 3.5 standard deviations. From these values we calculate 68.3% confidence intervals of (8.5 ° 〈 ϕ 3 〈 16.5 ° ) or (84.5 ° 〈 ϕ 3 〈 95.5 ° ) or (163.3 ° 〈 ϕ 3 〈 171.5 ° ) and 0.321 〈 r B 〈 0.465.
Type of Medium:
Online Resource
ISSN:
1029-8479
DOI:
10.1007/JHEP05(2024)212
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2024
detail.hit.zdb_id:
2027350-2
Permalink