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

2002/04/03 by Starostin, A., Nefkens, B. M. K., Staudenmaier, H. M.
#FOS: Physical sciences #Nuclear Experiment (nucl-ex)

paper · doi:10.48550/arxiv.nucl-ex/0204002

Abstract

We report on preliminary results for the production of neutral mesons by 750 MeV/c π^- on complex nuclear targets (C, Al, Cu) and hydrogen. Our simultaneous measurement of π⁰, 2π⁰, and η 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 2π⁰ invariant mass spectra. Our preliminary result for the σ→ γγ branching ratio is BR(σ→ γγ) < 3.6× 10^-3 × ϕ at 90% C.L. on a carbon target, where ϕ is the fraction of 2π⁰ produced via the σ intermediate state.

Related

• Nucleon and Hyperon Resonances with the Crystal Ball
• In Search of the f0 (or "sigma") Meson: New data on pi0 pi0 Production by pi- and K- on Hydrogen
• Interacting pion pairs in nuclear matter
• Nuclear effects in Reactions νp -> μ^- p π⁺ and νp -> μ^- Δ⁺⁺(1232) on Bound Protons
• Two-Meson and Multi-Pion Final States from 600 Gev Pion Interactions