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We extend the three-flavor linear sigma model with (axial-)vector mesons tofour flavors. We compute the masses of (pseudo)scalar and (axial-)vector mesonsincluding open and hidden charmed mesons as well as weak decay constants. Theresults are in good agreement with experimental data.

Masses of light and heavy mesons in a $U(4)_r \times U(4)_l$ linear sigma model