Semileptonic wrong-sign mixing asymmetry
= Semileptonic wrong-sign mixing asymmetry
{title2=$a_{\mathrm{SL}}=(1-|q/p|^4)/(1+|q/p|^4)$}
If <semileptonic decay> tags the decaying <Flavor eigenstate>[flavour], wrong-sign decays require <neutral meson mixing>. With no direct <CP violation> and no wrong-sign direct <decay amplitudes>, their rate asymmetry is $(|p/q|^2-|q/p|^2)/(|p/q|^2+|q/p|^2)=(1-|q/p|^4)/(1+|q/p|^4)$. The common time dependence cancels; contaminating direct amplitudes invalidate that isolation.