Recent BaBar results in charmonium and charm spectroscopy

Abstract

Recent results are presented on the study of the η _c and η _c (2S) resonance parameters and on the observation of two narrow states in the D _s spectrum, using the BaBar data set. The η _c and η _c (2S) are produced in γ γ interactions: a precision measurement of their mass and total width is reported, together with a study supporting the correct assignment of the η _c (2S) quantum numbers. Two states $D^{*+}_{sJ\ 2317}$, $D_{sJ\ 2457}^+$ are observed in continuum e⁺e^– production, decaying to D⁺ _s π⁰ and D⁺ _s π⁰γ respectively: their masses are measured and a study on the resonant structure of the D⁺ _sJ (2457) decay is reported. All results are preliminary¹.

PACS: PACS-13.66.Bc – PACS-14.40.Gx – PACS-14.40.Lb