The puzzle of the D and Ds mesons
Grupo de Fısica Nuclear and IUFFyM, Universidad de Salamanca, Salamanca, Spain
2 Departamento de Fısica Teórica and IFIC, Universidad de Valencia - CSIC, Valencia, Spain
Accepted: 1 November 2006
Published online: 22 February 2007
We present a theoretical framework that accounts for the new DJ and DsJ 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.
PACS: 14.40.Lb Charmed mesons – / 14.40.Ev Other strange mesons –
© Società Italiana di Fisica and Springer-Verlag, 2007