Measurement of the Phase of the $CP$ -Nonconservation Parameter $η_{+ -}$ and the $K_{S}$ Total Decay Rate

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12 May 1975

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 34 (19) , 1244-1246
https://doi.org/10.1103/physrevlett.34.1244

Abstract

The interference of

K_{S}

and

K_{L}

in the decay

K_{S, L} \to π^{+} π^{-}

has been studied by use of the

K_{S}

regeneration technique. With utilization of the results for the regeneration phase presented in the preceding Letter, the phase of

η_{+ -}

has been determined as a function of the

K_{L} - K_{S}

mass difference:

ϕ_{+ -} = (45.5 ° \pm 2.8 °) + 120 ° \frac{(Δ m - 0.5348)}{Δ m}

. The data also provide an accurate measurement of the

K_{S}

total decay rate:

Γ_{S} = [(1.122 \pm 0.004) + 0.16 \frac{(Δ m - 0.5348)}{Δ m}] \times 10^{10}

\sec^{- 1}

.

Keywords

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