Upper limit on the Ks ---> 3 pi0 decay
M.N.Achasov, V.M.Aulchenko, A.V.Berdyugin, A.V.Bozhenok, A.D.Bukin,, D.A.Bukin, S.V.Burdin, T.V.Dimova, V.P.Druzhinin, M.S.Dubrovin,, I.A.Gaponenko, V.B.Golubev, V.N.Ivanchenko, I.A.Koop, A.A.Korol, S.V.Koshuba,, I.N.Nesterenko, E.V.Pakhtusova, A.A.Salnikov, S.I.Serednyakov
TL;DR
This paper reports a search for the CP-violating decay K_S to 3 pi0, setting a new upper limit on its branching ratio based on analysis of 7 million K_S mesons with no candidate events found.
Contribution
The study provides the most stringent upper limit on the branching ratio of K_S to 3 pi0 decay to date, improving constraints on CP violation in this channel.
Findings
No candidate events observed.
Upper limit on branching ratio: < 1.4 x 10^{-5} at 90% CL.
Analysis of 7 million K_S mesons.
Abstract
The search for CP-violating K_S\to3\pi^0 decay was performed with SND detector at VEPP-2M e^+e^- collider. The total amount of data corresponding to 7 million produced K_S mesons was analyzed. No candidate events were found, giving an upper limit of the decay branching ratio: Br(K_S\to3\pi^0) < 1.4\cdot10^{-5} at 90% confidence level.
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