String point of view for heavy-light mesons

Abstract

An approximate rotational symmetry of a heavy-light meson is viewed from a string picture. Using a simple string configuration, we derive a formula, $(M-m_c{)}^2=\pi \sigma L$, whose coefficient of the r.h.s. is just 1/2 of that of a light meson with two light quarks. A numerical plot is obtained for $D$ mesons of experimental data as well as several theoretical models, which shows good agreement with this formula.

Comments: 4 pages, 5 figures, talk at XII Quark Confinement and the Hadron Spectrum