Measurement of the $K_{S}^{0} - K_{L}^{0}$ Mass Difference by the Time Dependence of Strangeness

The magnitude of the

K_{S}^{0} - K_{L}^{0}

mass difference

Δ ω

has been measured by monitoring the time dependence of the strangeness of neutral

K

's produced in hydrogen and deuterium in the LRL 25-in. hydrogen bubble chamber. The particles originate as

{\bar{K}}^{0}

K^{-}

charge-exchange scatters at 0.85 to 1.15

\frac{BeV}{c}

; the signature for an

S = - 1

reaction is the production of a hyperon. Seventy-seven events were found, resulting in

Δ ω = 0.50 \pm 0.15

, measured in units of inverse

K_{S}^{0}

lifetime. This and two other recent measurements using the same method are consistent with one another and with measurements of

Δ ω

by other means.

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Measurement of theKS0−KL0Mass Difference by the Time Dependence of Strangeness