Observation of new resonances decaying to $D\pi$ and $D^*\pi$ in inclusive $e^+e^-$ collisions near $\sqrt{s}=$10.58 GeV

TL;DR

This paper reports the first observation of new excited $D$ meson states, including radial and orbital excitations, in inclusive $e^+e^-$ collisions at 10.58 GeV using the BABAR detector.

Contribution

It presents the first evidence for radial and orbital excitations of $D$ mesons in $e^+e^-$ collisions near 10.58 GeV.

Findings

Candidates for radial excitations of $D^0$, $D^{*0}$, and $D^{*+}$ observed.

Candidates for L=2 excited states of $D^0$ and $D^+$ observed.

First-time observation of these excited states in this energy regime.

Abstract

We present a study of the $D^+\pi^-$, $D^0\pi^+$, and $D^{*+}\pi^-$ systems in inclusive $e^+e^- \rightarrow c\bar{c}$ interactions in a search for new excited $D$ meson states. We use a dataset, consisting of $\sim$454 fb$^{-1}$, collected at center-of-mass energies near 10.58 GeV by the BABAR detector at the SLAC PEP-II asymmetric-energy collider. We observe, for the first time, candidates for the radial excitations of the $D^0$, $D^{*0}$, and $D^{*+}$, as well as the L=2 excited states of the $D^0$ and $D^+$, where $L$ is the orbital angular momentum of the quarks.