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Meson production on complex nuclei by pi^- with the Crystal Ball detector | | A.Starostin
; B.M.K.Nefkens
; H.M.Staudenmaier
; for the Crystal Ball Collaboration
; | | Date: |
3 Apr 2002 | | Subject: | nucl-ex | | Abstract: | 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 $pi^0$, $2pi^0$, 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 $2pi^0$ invariant mass spectra. Our preliminary result for the $sigma o gamma gamma$ branching ratio is BR$(sigma o gamma gamma) < 3.6 imes 10^{-3} imes phi$ at 90% C.L. on a carbon target, where $phi$ is the fraction of $2pi^0$ produced via the $sigma$ intermediate state. | | Source: | arXiv, nucl-ex/0204002 | | Services: | Forum | Review | PDF | Favorites | |
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