In‐medium modifications of the ω meson

Nanova, Mariana

doi:doi:10.1063/1.3483425

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AIP Conference Proceedings / Volume 1257

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In‐medium modifications of the ω meson

AIP Conf. Proc. 1257, pp. 705-709; doi:http://dx.doi.org/10.1063/1.3483425 (5 pages)

HADRON 2009: Proceedings of the XIII International Conference on Hadron Spectroscopy

Date: 29 November–4December 2009

Location: Tallahassee (FL)

Mariana Nanova and The CBELSA∕TAPS Collaboration

II. Physikalisches Institut, Universitaet 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. ω‐mesons were reconstructed using the ω→π⁰γ channel. In a first analysis of the data set on a Nb target, published by D. Trnka et al.. [1], evidence for an in‐medium mass shift of the ω‐meson was deduced from the observed ω lineshape. The signal shape is, however, sensitive to the background subtraction and fitting procedure as pointed out in the literature [2, 3]. 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 Gi‐BUU transport model calculations for the full incident photon energy range (900–2200 MeV) and near the production threshold (900–1400 MeV).