Eur. Phys. J. A (2007) 31: 722-724
https://doi.org/10.1140/epja/i2006-10199-0

QNP 2006

The puzzle of the D and D_s mesons

¹ Grupo de Fısica Nuclear and IUFFyM, Universidad de Salamanca, Salamanca, Spain
² Departamento de Fısica Teórica and IFIC, Universidad de Valencia - CSIC, Valencia, Spain

Received: 25 October 2006
Accepted: 1 November 2006
Published online: 22 February 2007

Abstract

We present a theoretical framework that accounts for the new D_J and D_sJ mesons measured in the open-charm sector. These resonances are properly described if considered as a mixture of conventional P-wave quark-antiquark states and four-quark components. The narrowest states are basically P-wave quark-antiquark mesons, while the dominantly four-quark states are shifted above the corresponding two-meson threshold. We study the electromagnetic decay widths as basic tools to scrutiny their nature.