Meson production on complex nuclei by pi^- with the Crystal Ball detector

Details Meson production on complex nuclei by pi^- with the Crystal Ball detector Meson production on complex nuclei by pi^- with the Crystal Ball detector

2002-04-03

arxiv.org/abs/nucl-ex/0204002v1

Physics

Nuclear Physics

Nuclear Experiment

Contribution to the International Workshop on Chiral Fluctuations in Hadronic Matter, Orsay, France, September 2001 (17 pages)

Scientific paper

We report on preliminary results for the production of neutral mesons by 750 MeV/$c$ $\pi^-$ on complex nuclear targets (C, Al, Cu) and hydrogen. Our simultaneous measurement of $\pi^0$, $2\pi^0$, and $\eta$ final states allows an investigation of the nuclear final-state-interaction effects. The data show that nuclear absorption is mainly responsible for an observed change in the shape of the $2\pi^0$ invariant mass spectra. Our preliminary result for the $\sigma \to \gamma \gamma$ branching ratio is BR$(\sigma \to \gamma \gamma) < 3.6\times 10^{-3} \times \phi$ at 90% C.L. on a carbon target, where $\phi$ is the fraction of $2\pi^0$ produced via the $\sigma$ intermediate state.

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