Meson decay constants from isospin mass splittings in the quark model

Abstract

Decay constants of $D$ and $B$ mesons are estimated within the framework of a heavy-quark approach using measured isospin mass splittings in the $D$, ${D}^{*}$, $B$, and ${B}^{*}$ states to isolate the electromagnetic hyperfine interaction between quarks. A relation following from the use of splittings in kaons is also considered.