Measurement of mass and width of the excited charmed meson states $D_{1}^{0}$ and $D_{2}^{* 0}$ at CDF

We report on precision measurements of the masses and widths of the narrow, orbitally excited states

D_{1}^{0}

and

D_{2}^{* 0}

using the CDF II detector at the Fermilab Tevatron. Both states (collectively called

D^{**}

) are reconstructed in the decay channel

D^{**} \to D^{* +} π^{-}

. The

D_{2}^{* 0}

is also reconstructed in the

D^{**} \to D^{+} π^{-}

channel. Using a data set with an integrated luminosity of

210 {pb}^{- 1}

, the measured masses and widths for the

D_{1}^{0}

are

2421.7 \pm 0.7 \pm 0.6 MeV / c^{2}

and

20.0 \pm 1.7 \pm 1.3 MeV / c^{2}

respectively, while for the

D_{2}^{* 0}

they are

2463.3 \pm 0.6 \pm 0.8 MeV / c^{2}

and

49.2 \pm 2.3 \pm 1.2 MeV / c^{2}

. These values are currently the single best measurements available.

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Measurement of mass and width of the excited charmed meson statesD10andD2*0at CDF