Radiative and pionic decays of theD/emph>mesons and the magnetic moment of the charmed quark

The radiative and pionic decays of the $D^{\mathrm{*}}$ mesons are studied using a quark-bag model which includes effects of pion-exchange currents. We find that uncertainties in current experiments are large enough to allow a significant value of a possible charmed-quark anomalous magnetic moment. Therefore, improved experiments would be useful. Other consequences of an anomalous magnetic moment are the following. The ratio of hadrons to ${\mu }^{+}$ ${\mu }^{\mathrm{-}}$ pairs produced in $e^{+}$ $e^{\mathrm{-}}$ annihilations should rise significantly as the center-of-mass energy increases from 40 GeV; the decay rate for ψJ→${\eta }_c$+γ is reduced; and computed magnetic moments of charmed baryons are modified.