Radiative $D^{\ast }$ Decay Using Heavy Quark and Chiral Symmetry

Abstract

The implications of chiral $SU(3{)}_L\times SU(3{)}_R$ symmetry and heavy quark symmetry for the radiative decays $D^{\ast 0}\to D^0\gamma$, $D^{\ast +}\to D^{+}\gamma$, and $D_s^{\ast }\to D_s\gamma$ are discussed. Particular attention is paid to $SU(3)$ violating contributions of order $m_q^{1/2}$. Experimental data on these radiative decays provide constraints on the $D^{\ast }D\pi$ coupling.

Comments: 9 pages plus 3 pages of figures in POSTSCRIPT file appended to TeX file (uses harvmac.tex and tables.tex), UCSD/PTH 92-31, CALT-68-1816, EFI-92-45, CERN-TH.6650/92