Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 44: Hadronenstruktur und -spektroskopie
HK 44.3: Vortrag
Dienstag, 5. März 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. Rischke1,2 — 1Institut 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.