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A search for a massless dark photon $\gamma^{\prime}$ is conducted using 4.5$\mathrm{fb}^{-1}$ of $e^+e^-$ collision data collected at center-of-massenergies between 4.600 and 4.699 $\mathrm{GeV}$ with the BESIII detector atBEPCII. No significant signal is observed, and the upper limit on the branchingfraction $\mathcal{B}(\Lambda^{+}_{c}\to p \gamma^{\prime})$ is determined tobe $8.0\times 10^{-5}$ at 90% confidence level.

Search for a massless dark photon in $\Lambda^{+}_{c}\to p \gamma^{\prime}$ decay