Determination of the Fundamental Parameters of the $K^{0} - {\bar{K}}^{0}$ System in the Energy Range 30-110 GeV

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10 May 1982

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

Vol. 48 (19) , 1306-1309
DOI:10.1103/physrevlett.48.1306

Abstract

K^{0}

regeneration data in the energy range 30-110 GeV have been analyzed to determine the values of the

K_{L} - K_{S}

mass difference,

Δ m

,

K_{S}

lifetime,

τ_{S}

, and

CP

-nonconservation parameter

η_{+ -}

. We find

Δ m = 0.482 (14) \times 10^{10} ℏ

s^{- 1}

,

τ_{S} = 0.905 (7) \times 10^{- 10}

s,

| η_{+ -} | = 2.09 (2) \times 10^{- 3}

, and

tan ϕ_{+ -} = 0.709 (102)

, corresponding to

ϕ_{+ -} = 35 (4) °

. The data suggest that these parameters may have an anomalous energy dependence.

Keywords

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