P-wave charmed mesons ine+e−annihilation

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Abstract

Using the CLEO detector at the Cornell Electron Storage Ring, we have found evidence for $L=1$ charmed mesons in ${e}^{+}{e}^{\ensuremath{-}}$ annihilations. We observe a ${D}^{**0}$ state at mass 2461\ifmmode\pm\else\textpm\fi{}3\ifmmode\pm\else\textpm\fi{}1 MeV/${\mathit{c}}^{2}$ and width $20_{\ensuremath{-}12\ensuremath{-}10}^{}{}_{}{}^{+9+9}$ MeV/${\mathit{c}}^{2}$ decaying to ${D}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$. We also see an enhancement in the $m({D}^{*+}{\ensuremath{\pi}}^{\ensuremath{-}})\ensuremath{-}m({D}^{*+})$ mass-difference spectrum and by examining ${D}^{*+}$ decay-angle dependence, we see structure consistent with two states decaying to ${D}^{*+}{\ensuremath{\pi}}^{\ensuremath{-}}$. We observe a lower-mass state, at mass (2428\ifmmode\pm\else\textpm\fi{}3\ifmmode\pm\else\textpm\fi{}2) MeV/${\mathit{c}}^{2}$ and width ($23_{\ensuremath{-}6\ensuremath{-}4}^{}{}_{}{}^{+8+10}$) MeV/${\mathit{c}}^{2}$, assuming that the higher-mass component is from the decay ${D}^{**0}(2461)\ensuremath{\rightarrow}{D}^{*+}{\ensuremath{\pi}}^{\ensuremath{-}}$. We present arguments for the spin-parity assignments of these states. We also report observation of candidate $L=1$ $c\overline{s}$ state decaying to ${D}^{*+}{K}_{s}^{0}$.

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