The spin and parity of the charmed mesons $D_{ s}^{ *+}$, $D^{ *0}$ and $D^{ *+}$ are determined for the first time to be $J^P=1^{ -}$ with significances greater than 10$\sigma$ over other hypotheses of $2^{ +}$ and $3^{ -}$, using an $e^+e^-$ collision data sample with an integrated luminosity of 3.19 fb$^{ -1}$ collected by the BESIII detector at a center-of-mass energy of 4.178 GeV. Different spin-parity hypotheses for $D_{ s}^{ *+}$, $D^{ *0}$, and $D^{ *+}$ mesons are tested via a helicity amplitude analysis of the processes $e^+e^-\to D^{ *+}_{ s}D^{ -}_{ s}$, $D^{ *0}D^{ 0}$ and $D^{ *+}D^{ -}$, with $D^{ *+}_{ s}\to D^{ +}_{ s} \gamma$, $D^{ *0}\to D^{ 0}\pi^{ 0}$, and $D^{ *+}\to D^{ +}\pi^{ 0}$. The results confirm the quark model predictions.
Categories: hep-ex