Measurement of the eta->pi+pi-e+e- decay branching ratio

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.

10 pages,6 figures revised version

References in corpus (6)

• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• The Cosmological Parameters 2006
• Dilepton Spectra from Decays of Light Unflavored Mesons
• Observation of CP Violation in K(L)->pi+pi-e+e- Decays
• Study of conversion decays phi->etae+e-, eta->e+e-g and eta->pi+pi-e+e- at CMD-2
• The CP-violating asymmetry in η\toπ^+ π^- e^+e^-

Cited by in corpus (8)

• The WASA Detector Facility at CELSIUS
• Precision tests of fundamental physics with $\eta$ and ${\eta }^{\prime }$ mesons
• Measurement of eta meson decays into lepton-antilepton pairs
• eta, eta-prime --> pi+ pi- l+ l- in a chiral unitary approach
• Signals of the QCD axion with mass of 17 MeV/c^2: nuclear transitions and light meson decays
• Measurement of the branching ratio and search for a CP violating asymmetry in the eta -> pi+pi-e+e-(gamma) decay at KLOE
• Measurements of Branching Ratios for $\eta$ Decays into Charged Particles
• Meson-production experiments at COSY-Juelich