Abstract
The WASA (Wide Angle Shower Apparatus) facility is a 4π detector system for charged and neutral particles that has been designed to study production and decay of light mesons. After successful operation at CELSIUS the facility has started data taking as fixed target internal experiment at the COoler SYnchrotron and storage ring COSY [1] at Forschungszentrum Jülich in 2007. COSY delivers beams of polarized and unpolarized protons and deuterons in the momentum range between 0.3 and 3.7 GeV/c. In collisions with a hydrogen or deuterium target, mesons with masses up to the φ meson can be produced. The WASA detector setup (Figure 1) comprises a forward part to measure charged target-recoil particles and scattered projectiles, a central part to measure meson decay products, and a pellet target.
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