Measurement of masses and widths of excited charm mesons D 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 $D_2^{*0}$ mass $M_{D_2^{*0}} = (2464.5 \\pm 1.1 \\pm 1.9) \\mev$ and width $\\Gamma_{D_2^{*0}} = (38.7 \\pm 5.3 \\pm 2.9) \\mev$, and the $D_2^{*+}$ mass $ M_{D_2^{*+}} = (2467.6 \\pm 1.5 \\pm 0.76) \\mev$ and width $ \\Gamma_{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 $M_{1/2}^0 =(2407 \\pm 21 \\pm 35) \\mev$, $\\Gamma_{1/2}^0 = (240 \\pm 55 \\pm 59) \\mev$, and $M_{1/2}^+ = (2403 \\pm 14 \\pm 35) \\mev$ $\\Gamma_{1/2}^+ = (283 \\pm 24 \\pm 34) \\mev$, respectively.