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MESONS IN THE MEDIUM: EXPERIMENTS WITH CLAS AT JEFFERSON LAB

Author:
WOOD, M. H.   NASSERIPOUR, R.   PAOLONE, M.   DJALALI, C.   WEYGAND, D. P.  


Journal:
International Journal of Modern Physics A


Issue Date:
2011


Abstract(summary):

In this article, we report on on investigations of the in-medium meson-nucleon interaction for the omega, phi, and K(s)(0) mesons. Their in-medium cross sections and collisional widths can be measured by their absorption in a nucleus. In Hall B at the Thomas Jefferson National Accelerator Facility (JLab), the CLAS detector was used to study these long-lived mesons in nuclei. All of the mesons were produced by a photon beam with E(gamma) < 4 GeV in targets of (2)H, C, Fe, and Pb. The vector mesons were reconstructed through their decay into e(+)e(-). The K(s)(0) mesons were measured with their dominant pi(+)pi(-) decay. The in-medium widths of the omega and phi mesons are found to be substantially larger than their values from the elementary reaction with a free nucleon. The analysis with the K(s)(0) is preliminary, and its status will be discussd in this paper


Page:
734-736


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