Measurement of the eta->pi+pi-e+e- decay branching ratio
CELSIUS-WASA Collaboration: Chr. Bargholtz, M. Bashkanov, D., Bogoslawsky, H. Cal\'en, F. Capellaro, H. Clement, L. Demir\"ors, C., Ekstr\"om, K. Fransson, L. Ger\'en, L. Gustafsson, B. H\"oistad, G. Ivanov,, M. Jacewicz, E. Jiganov, T. Johansson, S. Keleta, I. Koch
TL;DR
This paper reports a precise measurement of the eta meson decay branching ratio into pi+ pi- e+ e-, using a proton-deuteron collision experiment with the WASA detector to produce eta mesons at threshold.
Contribution
It provides the first measurement of the eta->pi+pi-e+e- decay branching ratio using a clean eta source at threshold.
Findings
Branching ratio measured as (4.3+/-1.3+/-0.4)x10^-4
Used pd->3He eta reaction at threshold for eta production
Employs WASA detector at CELSIUS facility
Abstract
The reaction pd->3He eta at threshold was used to provide a clean source of eta mesons for decay studies with the WASA detector at CELSIUS. The branching ratio of the decay eta->pi+pi-e+e- is measured to be (4.3+/-1.3+/-0.4)x10^-4.
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