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A study of $D^+\pi^-$, $D^0 \pi^+$ and $D^{*+}\pi^-$ final states isperformed using pp collision data, corresponding to an integrated luminosity of1.0 $fb^{-1}$, collected at a centre-of-mass energy of 7 TeV with the LHCbdetector. The $D_1(2420)^0$ resonance is observed in the $D^{*+}\pi^-$ finalstate and the $D^*_2(2460)$ resonance is observed in the $D^+\pi^-$, $D^0\pi^+$ and $D^{*+}\pi^-$ final states. For both resonances, their propertiesand spin-parity assignments are obtained. In addition, two natural parity andtwo unnatural parity resonances are observed in the mass region between 2500and 2800 MeV. Further structures in the region around 3000 MeV are observed inall the $D^{*+}\pi^-$, $D^+\pi^-$ and $D^0 \pi^+$ final states. Using three-and four-body decays of $D$ mesons produced in semileptonic $b$-hadron decays,precision measurements of $D$ meson mass differences are made together with ameasurement of the $D^{0}$ mass.

Open Charm Spectroscopy and Mass Measurements in LHCb