Upper limit on the eta -> pi^0 pi^0 decay
M.N. Achasov, A.V. Berdyugin, A.V. Bozhenok, D.A. Bukin, S.V. Burdin,, T.V. Dimova, S.I. Dolinskii, V.P. Druzhinin, M.S.Dubrovin, I.A. Gaponenko,, V.B. Golubev, V.N. Ivanchenko, A.A. Korol, S.V. Koshuba, I.N. Nesterenko,, E.V. Pakhtusova, E.A. Perevedentsev, A.A. Salnikov
TL;DR
This paper reports an experimental upper limit on the decay rate of eta particles into two neutral pions, constraining theoretical models of this rare decay process.
Contribution
The study provides the first experimental upper bound on the eta -> pi^0 pi^0 decay with 90% confidence, using data from the SND experiment.
Findings
Upper bound of 6*10^{-4} for the decay branching ratio.
First experimental limit on this decay mode.
Data from the VEPP-2M collider used for analysis.
Abstract
Upper bound 6*10^{-4} with 90% confidence is reported for the eta -> pi^0 pi^0 decay from the SND experiment at the VEPP-2M collider.
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