Measurement of the Phase of the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>CP</mi></math>-Nonconservation Parameter <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>η</mi></mrow><mrow><mo>+</mo><mo>−</mo></mrow></msub></mrow></math> and the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>K</mi></mrow><mrow><mi>S</mi></mrow></msub></mrow></math> Total Decay Rate

W. C. Carithers; T. Modis; D. R. Nygren; T. P. Pun; E. L. Schwartz; H. Sticker; J. H. Christenson

doi:10.1103/PhysRevLett.34.1244

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

W. C. Carithers, T. Modis, D. R. Nygren, T. P. Pun, E. L. Schwartz, H. Sticker, and J. H. Christenson

Phys. Rev. Lett. 34, 1244 – Published 12 May 1975

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: $Γ_{S} = [(1.122 \pm 0.004) + 0.16 \frac{(Δ m - 0.5348)}{Δ m}] \times 10^{10}$ $\sec^{- 1}$ .

Received 20 January 1975

DOI:https://doi.org/10.1103/PhysRevLett.34.1244

Authors & Affiliations

W. C. Carithers^*, T. Modis^†, D. R. Nygren^‡, T. P. Pun^§, E. L. Schwartz^∥, and H. Sticker^¶

Columbia University, New York, New York 10027

J. H. Christenson

New York University, New York, New York 10003

^*Present address: University of Rochester, Rochester, N. Y. 14627. Sloan Foundation Fellow, 1972-1974.
^†Present address: CERN, Geneva, Switzerland.
^‡Present address: Lawrence Berkeley Laboratory, Berkeley, Calif. 94720.
^§Present address: Stanford Linear Accelerator Center, Stanford, Calif. 94305.
^∥Present address: Brain Research Laboratory, New York Medical College, New York, N. Y.
^¶Present address: Rockefeller University, New York, N. Y. 10021.