ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2007, vol. 644, p. 299-303
Measurement of the η → π+ π- e+ e- decay branching ratio
The reaction p d → 3He η at threshold was used to provide a clean source of η mesons for decay studies with the WASA detector at CELSIUS. The branching ratio of the decay η → π+ π- e+ e- is measured to be (4.3 ± 1.3 ± 0.4) × 10-4. © 2006 Elsevier B.V. All rights reserved.