%0 Journal Article %T Masses of mesons with charm valence quarks from 2+1+1 flavor twisted mass lattice QCD %A Martin Kalinowski %A Marc Wagner %J Physics %D 2013 %I arXiv %X We present preliminary results of an ongoing lattice QCD computation of the spectrum of $D$ mesons and $D_s$ mesons and of charmonium using 2+1+1 flavors of twisted mass sea and valence quarks. %U http://arxiv.org/abs/1304.7974v1