Measurement of Masses and Widths of Excited Charm Mesons $D_2^{\ast }$ and Evidence for Broad States

Abstract

Using data from the FOCUS experiment we analyze the $D^{+}{\pi }^{-}$ and $D^0{\pi }^{+}$ invariant mass distributions. We measure the $D_2^{\ast 0}$ mass $M_{D_2^{*0}} = (2464.5 \pm 1.1 \pm 1.9) \mev$ and width $Γ_{D_2^{*0}} = (38.7 \pm 5.3 \pm 2.9) \mev$, and the $D_2^{\ast +}$ mass $ M_{D_2^{*+}} = (2467.6 \pm 1.5 \pm 0.76) \mev$ and width $ Γ_{D_2^{*+}} = (34.1 \pm 6.5 \pm 4.2) \mev$. We find evidence for broad structures over background in both the neutral and charged final state. If each is interpreted as evidence for a single L=1, $j_q=1/2$ excited charm meson resonance, the masses and widths are $M_{1/2}^0 =(2407 \pm 21 \pm 35) \mev$, $Γ_{1/2}^0 = (240 \pm 55 \pm 59) \mev$, and $M_{1/2}^+ = (2403 \pm 14 \pm 35) \mev$ $Γ_{1/2}^+ = (283 \pm 24 \pm 34) \mev$, respectively.

15 pages, 4 figures. Submitted to Phys. Lett. B. Added preprint numbers

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