Abstract
We investigate the possibility of observing CP violation in the process ${\mathit{K}}^{+}$\ensuremath{\rightarrow}${\mathrm{\ensuremath{\pi}}}^{+}$ll\ifmmode\bar\else\textasciimacron\fi{}. We find that, from the point of view of probing the Cabbibo-Kobayashi-Maskawa (CKM) mechanism, the measurement of two-spin correlations of the outgoing leptons is the best recourse. For this purpose, we define a T-violating asymmetry ${\mathit{A}}_{\mathrm{CPV}}$, which is the coefficient of the coefficient of the correlation p${\mathrm{^}}_{\mathit{l}}$\ensuremath{\cdot}s\ifmmode\times\else\texttimes\fi{}s\ifmmode\bar\else\textasciimacron\fi{} in the differential decay rate. In the standard model we estimate ${\mathit{A}}_{\mathrm{CPV}}$\ensuremath{\sim}1.9\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}2}$ for the muon mode, using the currently allowed CKM parameters and a top-quark mass of 200 GeV/${\mathit{c}}^{2}$.
Published Version
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