Direct search for the C-violating decay η0 → π0 e+ e

Authors :: U. Nguyen-Khac
F. Jacquet
H. H. Bingham
W. Michael
P. Musset
A. Bezaguet
G. Nihoul-Boutang
C. Baglin
B. Degrange
Source :: Physics Letters. 22:219-223
Publication Year :: 1966
Publisher :: Elsevier BV, 1966.
Abstract: No examples of this decay have been found in a sample of film containing 387 η 0 → π 0 π + π - decays with π 0 detected. The film was taken with the Ecole Polytechnique heavy liquid bubble chamber exposed to 950 MeV/ c π - at Saclay. With 90% confidence the branching ratio η 0 → π 0 e + e - is less than 0.23% of all η 0 decays.