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arXiv · hep-ex/9409003

Determination of the branching ratios $Γ(K_L \to 3 π^0) / Γ(K_L \to π^+ π^- π^0)$ and $Γ(K_L \to 3 π^0) / Γ(K_L \to πe ν)$

A. Kreutz·M. Holder·M. Rost·R. Werthenbach·K. J. Peach·H. Blümer·R. Heinz·K. Kleinknecht·P. Mayer·B. Panzer·B. Renk·H. Rohrer·A. Wagner·E. Augé·D. Fournier·L. Iconomidou-Fayard·O. Perdereau·A. C. Schaffer·L. Serin·L. Bertanza·A. Bigi·P. Calafiura·M. Calvetti·R. Carosi·R. Casali·C. Cerri·I. Mannelli·V. Marzulli·A. Nappi·G. M. Pierazzini
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Abstract

Improved branching ratios were measured for the $K_L \to 3 π^0 $ decay in a neutral beam at the CERN SPS with the NA31 detector: $Γ(K_L \to 3 π^0) / Γ(K_L \to π^+ π^- π^0) = 1.611 \pm 0.037$ and $Γ(K_L \to 3 π^0) / Γ(K_L \to πe ν) = 0.545 \pm 0.010$. From the first number an upper limit for $ΔI =5/2$ and $ΔI = 7/2 $ transitions in neutral kaon decay is derived. Using older results for the Ke3/K$μ$3 fraction, the 3$π^0$ branching ratio is found to be $Γ(K_L \to 3 π^0 )/ Γ_{tot} = (0.211 \pm 0.003)$, about a factor three more precise than from previous experiments.

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A. Kreutz, M. Holder, M. Rost, R. Werthenbach, K. J. Peach, H. Blümer, R. Heinz, K. Kleinknecht, P. Mayer, B. Panzer, B. Renk, H. Rohrer, A. Wagner, E. Augé, D. Fournier, L. Iconomidou-Fayard, O. Perdereau, A. C. Schaffer, L. Serin, L. Bertanza, A. Bigi, P. Calafiura, M. Calvetti, R. Carosi, R. Casali, C. Cerri, I. Mannelli, V. Marzulli, A. Nappi, G. M. Pierazzini. 1994-09-21. Determination of the branching ratios $Γ(K_L \to 3 π^0) / Γ(K_L \to π^+ π^- π^0)$ and $Γ(K_L \to 3 π^0) / Γ(K_L \to πe ν)$. https://doi.org/10.1007/bf01571304

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