The decays K → πγγ andK+ → π+π0 in the η-pole approximation

doi:10.1016/0550-3213(67)90077-6

Nuclear Physics B

Volume 3, Issue 3, 15 October 1967, Pages 234-240

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Abstract

Using a width of 1 keV for the decay η → γγ, we calculate the contribution of the η-pole to the decay K⁺ → π⁺γγ. The decay K_L⁰ → π⁰γγ is related to the decay K_L⁰ → γγ through the branching ratio Γ(η → π⁰γγ)/Γ(η → γγ). It is also shown that the electromagnetic π⁰η mixing can account for the decay K⁺ → π⁺π⁰.

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Cited by (15)

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A search for K⁺ → π⁺γ, π⁺γγ, π⁺γγγ was made detecting pions from stopped kaons in the kinetic energy region between 117 MeV and 127 MeV. New Limits of 1.4 ×10⁻⁶, 8.4 × 10⁻⁶ and 1.0 × 10⁻⁴ for the branching ratio were obtained assuming a phase-space spectrum on the pion energy. The first limit also aplies to another process K⁺ → π⁺ + a, where a is a light meson with mass smaller than 100 MeV/c² and decays into nγ's with lifetime less than 10⁻⁹ s.
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1971, Nuclear Physics, Section B
A simple chiral model is studied for including the effects of σ-commutator terms in single-meson matrix elements of the conventional second-order electromagnetic Hamiltonian and it is conclude that they cannot be quantitatively identified with tadpole electromagnetic effects. In justifying the model, a new procedure is discussed for doing PCAC calculations with a pure octet η meson. The results of tadpole electromagnetic effects in K → 2π decays are illustrated in the appendix.
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Nuclear Physics B

Abstract

References (11)

Phys. Letters

Phys. Rev. Letters

Phys. Rev.

Phys. Rev. Letters

Phys. Rev. Letters

Phys. Rev.

Cited by (15)

A new experimental limit for the decay K<sup>+</sup> → π<sup>+</sup>γγ

Tadpole electromagnetic effects σ-commutator terms and η PCAC

Scalar-meson model and radiative decays of the K meson

New experimental upper limit for the decay K± →γγ

SU(3)-symmetry breaking and the K20→π0γγ decay

The ΔI=<sup>3</sup>/<inf>2</inf>, <sup>5</sup>/<inf>2</inf> contributions in K→2 π decays and (δ<inf>0</inf>- δ<inf>2</inf>) S-wave π-π phase shifts