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Measurement of branching fractions and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>violation parameters in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:mi>ω</mml:mi><mml:mi>K</mml:mi></mml:math>decays with first evidence of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></…
We present a measurement of the branching fractions and charge-parity-($CP$-)violating parameters in $B\ensuremath{\rightarrow}\ensuremath{\omega}K$ decays. The results are obtained from the final data sample containing $772\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected at the $\mathrm{\ensuremath{\Upsilon}}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. We obtain the branching fractions $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}\ensuremath{\omega}{K}^{0})=(4.5\ifmmode\pm\else\textpm\fi{}0.4(\text{stat})\ifmmode\pm\else\textpm\fi{}0.3(\text{syst}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},\mathcal{B}({B}^{+}\ensuremath{\rightarrow}\ensuremath{\omega}{K}^{+})=\phantom{\rule{0ex}{0ex}}(6.8\ifmmode\pm\else\textpm\fi{}0.4(\text{stat})\ifmmode\pm\else\textpm\fi{}0.4(\text{syst}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ which are …