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- W1973220565 abstract "The reaction ${ensuremath{pi}}^{ensuremath{-}}+pensuremath{rightarrow}ensuremath{Lambda}+{K}^{0}$ in the 72-in. hydrogen chamber was used to produce 7220 ${K}^{0}$ mesons associated with a visible decay $ensuremath{Lambda}ensuremath{rightarrow}p+{ensuremath{pi}}^{ensuremath{-}}$. The time dependence and absolute yield of the subsequent strong interactions of ${K}^{0}$ and ${K}^{0}$ in hydrogen were used to determine all the parameters of the neutral $K$ system, without the assumption of $mathrm{CPT}$ invariance or other assumptions about the weak interactions of neutral $K$'s. From the time distribution of 59 events of the type ${overline{K}}^{0}+pensuremath{rightarrow}mathrm{hyperon}$, we find the magnitude of the ${K}_{S}^{0}ensuremath{-}{K}_{L}^{0}$ mass difference. We then determine the mixing parameters $p$, $q$, ${p}^{ensuremath{'}}$, ${q}^{ensuremath{'}}$ of the neutral $K$ system by means of the time dependence and absolute yield of 11 charge-exchange events, ${K}^{0}+pensuremath{rightarrow}{K}^{+}+n$, and the absolute yield of 49 two-body interactions, ${overline{K}}^{0}+pensuremath{rightarrow}mathrm{hyperon}+mathrm{pion}$. The results are consistent with $mathrm{CPT}$ invariance and with values of the mixing parameters determined by means of weak interactions. We find the Biswas ratio $Rensuremath{equiv}frac{ensuremath{sigma}({K}_{L}pensuremath{rightarrow}{K}_{S}p)}{ensuremath{sigma}({K}_{L}pensuremath{rightarrow}mathrm{hyperon})}$ to be $R=0.41ifmmodepmelsetextpmfi{}0.13$ averaged over ${K}_{L}$ momenta from about 200 to 600 $frac{mathrm{MeV}}{c}$. This agrees with solution I of Kim and with the results of Kadyk et al. Our absolute yields for ${overline{K}}^{0}+pensuremath{rightarrow}mathrm{hyperon}+mathrm{pion}$ are in good agreement with the predictions of charge independence and the measured rates for ${K}^{ensuremath{-}}+pensuremath{rightarrow}mathrm{hyperon}+mathrm{pion}$. For the front-back asymmetry of the $ensuremath{Lambda}$ in ${overline{K}}^{0}+pensuremath{rightarrow}ensuremath{Lambda}+{ensuremath{pi}}^{+}$, we find $frac{(Fensuremath{-}B)}{(F+B)=ensuremath{-}0.48ifmmodepmelsetextpmfi{}0.18}$, indicating that the $P$ wave cannot be neglected relative to the $S$ wave in our momentum range." @default.
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- W1973220565 date "1971-06-01" @default.
- W1973220565 modified "2023-09-23" @default.
- W1973220565 title "Interactions of NeutralKMesons in Hydrogen" @default.
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- W1973220565 doi "https://doi.org/10.1103/physrevd.3.2553" @default.
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