Prefer a chat interface with context about you and your work?
Observation of the Radiative Decay<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">D</mml:mi></mml:mrow><mml:mrow><mml:mo>*</mml:mo><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mo>→</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">D</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mi>γ</mml:mi></mml:math>
We have observed a signal for the decay ${D}^{*+}\ensuremath{\rightarrow}{D}^{+}\ensuremath{\gamma}$ at a significance of 4 standard deviations. From the measured branching ratio $B({D}^{*+}\ensuremath{\rightarrow}{D}^{+}\ensuremath{\gamma})/B({D}^{*+}\ensuremath{\rightarrow}{D}^{+}{\ensuremath{\pi}}^{0})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.055\ifmmode\pm\else\textpm\fi{}0.014\ifmmode\pm\else\textpm\fi{}0.010$ we find $B({D}^{*+}\ensuremath{\rightarrow}{D}^{+}\ensuremath{\gamma})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.017\ifmmode\pm\else\textpm\fi{}0.004\ifmmode\pm\else\textpm\fi{}0.003,$ where the first uncertainty is statistical and the second is systematic. We also report the highest precision determination of the remaining ${D}^{*+}$ branching fractions.