Experimental Study of the Decays <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">K</mi></mrow><mrow><mi>S</mi><mo>,</mo><mi>L</mi></mrow></msub></mrow><mo>→</mo><mi>γ</mi><mi>γ</mi></math></span>

M. Banner; J. W. Cronin; C. M. Hoffman; B. C. Knapp; M. J. Shochet

doi:10.1103/PhysRevLett.29.237

Experimental Study of the Decays $K_{S, L} \to γ γ$

M. Banner, J. W. Cronin, C. M. Hoffman, B. C. Knapp, and M. J. Shochet

Phys. Rev. Lett. 29, 237 – Published 24 July 1972

Abstract

In an optical spark-chamber experiment, we measured the branching ratio $\frac{(K_{S} \to γ γ)}{(K_{S} \to all)}$ to be (-1.9 ± 2.4) × $10^{- 4}$ . The result assumes no interference between $K_{S} \to γ γ$ and $K_{L} \to γ γ$ . We also measured the branching ratio $\frac{(K_{L} \to γ γ)}{(K_{L} \to all)}$ to be $(4.32 \pm 0.55) \times 10^{- 4} \times {| \frac{η_{00}}{η_{+ -}} |}^{2}$ .

Received 1 May 1972

DOI:https://doi.org/10.1103/PhysRevLett.29.237

Authors & Affiliations

M. Banner^*, J. W. Cronin^†, C. M. Hoffman, B. C. Knapp^‡, and M. J. Shochet^†

Department of Physics, Joseph Henry Laboratories, Princeton University, Princeton, New Jersey 08540

^*Present address: Département de Physique des Particules Elémentaires, Centre d'Etudes Nucléaires, Saclay, France.
^†Present address: The Enrico Fermi Institute, University of Chicago, Chicago, Ill. 60637.
^‡Present address: Nevis Cyclotron Laboratory, Irvington-on-Hudson, N. Y.