# η Physics with the crystal ball detector

Research paper by A. B. Starostin

Indexed on: 01 Jul '07Published on: 01 Jul '07Published in: Physics of Atomic Nuclei

#### Abstract

The experimental results obtained with the Crystal Ball detector for the physics of η-meson decays are reviewed. The η → 3π0 Dalitz plot slope and the η → π0γγ decay width are measured with a high accuracy using 3 × 107η decays. Upper limits on the η → 3γ, η → 2π0γ, and η → 3π0γ C-forbidden decays are found. The sensitivity of these upper limits to C violation is estimated. An upper limit on the η → 4π0C P-forbidden decay is found for the first time and the sensitivity of this value to C P violation is estimated.