학술논문
Determination of the branching ratios $\Gamma (K_L \to 3 \pi^0) / \Gamma (K_L \to \pi^+ \pi^- \pi^0)$ and $\Gamma (K_L \to 3 \pi^0) / \Gamma (K_L \to \pi e \nu )$
Document Type
Working Paper
Author
Kreutz, A.; Holder, M.; Rost, M.; Werthenbach, R.; Peach, K. J.; Blümer, H.; Heinz, R.; Kleinknecht, K.; Mayer, P.; Panzer, B.; Renk, B.; Rohrer, H.; Wagner, A.; Augé, E.; Fournier, D.; Iconomidou-Fayard, L.; Perdereau, O.; Schaffer, A. C.; Serin, L.; Bertanza, L.; Bigi, A.; Calafiura, P.; Calvetti, M.; Carosi, R.; Casali, R.; Cerri, C.; Mannelli, I.; Marzulli, V.; Nappi, A.; Pierazzini, G. M.
Source
Z.Phys.C65:67-74,1995
Subject
Language
Abstract
Improved branching ratios were measured for the $K_L \to 3 \pi^0 $ decay in a neutral beam at the CERN SPS with the NA31 detector: $\Gamma (K_L \to 3 \pi^0) / \Gamma (K_L \to \pi^+ \pi^- \pi^0) = 1.611 \pm 0.037$ and $\Gamma (K_L \to 3 \pi^0) / \Gamma (K_L \to \pi e \nu ) = 0.545 \pm 0.010$. From the first number an upper limit for $\Delta I =5/2$ and $\Delta I = 7/2 $ transitions in neutral kaon decay is derived. Using older results for the Ke3/K$\mu $3 fraction, the 3$\pi^0$ branching ratio is found to be $\Gamma (K_L \to 3 \pi^0 )/ \Gamma_{tot} = (0.211 \pm 0.003)$, about a factor three more precise than from previous experiments.