We present measurements of ℛℓ3γ ≡ Γ(K L →±ℓ∓ νγ E γ* > 10 MeV)/Γ(KL →± ℓ∓ν), where ℓ = μ or e, and E γ* is the photon energy in the kaon rest frame. These measurements are based on KL decays collected in 1997 by the KTeV (E832) experiment at Fermilab. With samples of 1385 KL → π± μ∓ νγ and 14221 KL → π± e∓ νγ candidates, we find ℛKμ3γ = (0.530 ± 0.019)% and ℛKe3γ = (4.942 ± 0.062)%. We also examine distributions of photon energy and lepton-photon angle.
|Original language||English (US)|
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|State||Published - Jan 2005|
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)