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Dresden 2013 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 44: Hadronenstruktur und -spektroskopie

HK 44.3: Talk

Tuesday, March 5, 2013, 17:30–17:45, HSZ-403

A U(4)r × U(4)l linear sigma model with (axial-)vector mesons — •Walaa Eshraim1, Francesco Giacosa1, and Dirk H. Rischke1,21Institut für Theoretische Physik, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, D-60438 Frankfurt — 2Frankfurt Institute for Advanced Studies (FIAS), Ruth-Moufang-Straße 1, D-60438 Frankfurt

We present a linear sigma model with U(4)r × U(4)l global chiral symmetry, which in addition to scalar and pseudoscalar mesons also includes vector and axial-vector mesons. Apart from three new parameters pertaining to the charm degree of freedom, the parameters of the model are fixed from the Nf=3 flavor sector. Our results for the charmed meson masses and weak decay constants are in surprisingly good agreement with experimental data, with the marked exception of the scalar degrees of freedom, providing an indication that these states may not adhere to the standard quark-antiquark picture of a meson.
Supported by DAAD and HGS-HIRe.

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