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Hadrons and Nuclei


Eur. Phys. J. A 11, 95-103 (2001)

Studying the $\omega$ mass in-medium in $\gamma + \rightarrow \pi^0\gamma$ + X reactions

J.G. Messchendorp1, A. Sibirtsev2, 3, W. Cassing2, V. Metag1 and S. Schadmand1

1  II. Physikalisches Institut, Universität Gießen, 35392 Gießen, Germany
2  Institut für Theoretische Physik, Universität Gießen, 35392 Gießen, Germany
3  Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany

j.messchendorp@exp2.physik.uni-giessen.de

(Received: 5 December 2000 / Revised version: 23 April 2001 Communicated by P. Schuck)

Abstract
Simulations based on a coupled-channel transport model have been performed to analyze the feasibility to study the in-medium $\omega$ mass exploiting the process $\gamma+A\rightarrow\pi^0\gamma+X$ for C, Ca and Nb nuclei. The distortions due to final-state interactions of the $\pi^0$ and background contributions from the reaction $\gamma+A\rightarrow\pi^0\pi^0+X$ are found to be small in the mass range of interest ( $0.6< M_{\pi^0\gamma}< 0.8$ GeV). Furthermore, the effect of the detector resolution on the $\pi^0\gamma$ mass determination is discussed.

PACS
13.60.-r - Photon and charged-lepton interactions with hadrons.
13.60.Le - Meson production.
25.20.-x - Photonuclear reactions.
14.40.-n - Mesons.

© Società Italiana di Fisica, Springer-Verlag 2001