Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 25: Hadron Structure and Spectroscopy II

HK 25.4: Talk

Tuesday, March 17, 2009, 14:45–15:00, H-ZO 30

In-Medium Modifications of the ω Meson^⋆ — •Mariana Nanova — II. Physikalisches Institut, Giessen University, Germany

The behavior of vector mesons in a dense nuclear medium is one of the most fundamental research topics in hadron physics with respect to the question of chiral symmetry restoration [1]. Evidence for medium modifications of ω-meson has been published in [2]. New results from a re-analysis of the same CBELSA-TAPS experiment on a Nb target will be presented. A more stringent event selection has been applied, requiring a proton in coincidence with the ω-meson which is detected in the ω → π⁰γ channel. Because of the high sensitivity of the extracted ω signal shape to the background subtraction a new procedure has been developed to determine the background directly from the data by selecting 4γ events and randomly omitting one of the photons. The status of the analysis will be discussed and compared to the theoretical predictions.
[1] T. Hatsuda and S. H. Lee, Phys. Rev. C 46, R34 (1992)
[2] D. Trnka et. al, Phys. Rev. Lett. 94, 192303 (2005)
^⋆ Funded by DFG (SFB/TR-16)