Modification of the ω meson properties in the nuclear medium

Nanova, Mariana

doi:doi:10.1063/1.3541969

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AIP Conference Proceedings / Volume 1322

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Modification of the ω meson properties in the nuclear medium

AIP Conf. Proc. 1322, pp. 108-115; doi:http://dx.doi.org/10.1063/1.3541969 (8 pages)

INTERNATIONAL WORKSHOP ON CHIRAL SYMMETRY IN HADRONS AND NUCLEI

Date: 21–24 June 2010

Location: Valencia, (Spain)

Mariana Nanova and The CBELSA/TAPS Collaboration

II. Physikalisches Institut, Universität Giessen, D-35392, Germany

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Abstract

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We have investigated the in-medium modifications of ω mesons in photoproduction experiments using the Crystal Barrel(CB)/TAPS detector system at the ELSA accelerator facility in Bonn. The ω-mesons were reconstructed using the ω→π⁰γ channel. In a first analysis of the data set on a Nb target, published by Trnka et al. [Phys. Rev. Lett. 94(2005) 192303], evidence for an in-medium mass shift of the ω-meson was deduced from the observed ω line shape. The extracted signal shape was, however, found to be sensitive to the background subtraction. For this reason a re-analysis of the same data set was initiated with the goal to reduce the background and to deduce the shape and the absolute magnitude of the background directly from the data. Here we present recent results from this re-analysis. The omega signal resulting after background subtraction has been compared to different scenarios of GiBUU transport model calculations for the full incident photon energy range (900–2200 MeV) and near the production threshold (900–1300 MeV).