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A measurement of direct CP violation in the decay $B^{+} \rightarrow K^{+}\pi^{0}$ is reported using a data sample corresponding to an integratedluminosity of 5.4 $\textrm{fb}^{-1}$, collected with the LHCb experiment at acenter-of-mass energy of $\sqrt{s}=13$ TeV. The CP asymmetry is measured to be$0.025 \pm 0.015 \pm 0.006 \pm 0.003$, where the uncertainties are statistical,systematic, and due to an external input, respectively. This is the mostprecise measurement of the CP asymmetry in the decay $B^{+} \rightarrow K^{+}\pi^{0}$ and exceeds the precision on the current world average. This direct CPasymmetry is a key input to studies of a long-standing anomaly in $B$ mesondecays, known as the $K\pi$-puzzle. The asymmetry is consistent with theprevious measurements of this quantity, confirming and significantly enhancingthe observed anomalous difference between the direct CP asymmetries of the$B^{0} \rightarrow K^{+} \pi^{-}$ and $B^{+} \rightarrow K^{+} \pi^{0}$ decays.

Measurement of CP violation in the decay $B^{+} \rightarrow K^{+} \pi^{0}$