Search for the radiative leptonic decay D+→γe+νe
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Abstract
Using an electron-positron collision data sample of $2.93\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected at a center-of-mass energy of $\sqrt{s}=3.773\text{ }\text{ }\mathrm{GeV}$ with the BESIII detector, we present the first search for the radiative leptonic decay ${D}^{+}\ensuremath{\rightarrow}\ensuremath{\gamma}{e}^{+}{\ensuremath{\nu}}_{e}$. The analysis is performed with a double-tag method. We do not observe a significant ${D}^{+}\ensuremath{\rightarrow}\ensuremath{\gamma}{e}^{+}{\ensuremath{\nu}}_{e}$ signal, and obtain an upper limit on the branching fraction of ${D}^{+}\ensuremath{\rightarrow}\ensuremath{\gamma}{e}^{+}{\ensuremath{\nu}}_{e}$ decay with the energy of radiative photon larger than 10 MeV of $3.0\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ at the 90% confidence level.
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