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The first search for the baryonic decay Dₛ*+ → \ p n̄ is performed using e⁺e⁻ collision data taken at center-of-mass energies between 4.128 and 4.226 GeV, collected by the BESIII experiment and corresponding to an integrated luminosity of 7.33 fb⁻¹. No significant signal is observed, and an upper limit on the branching fraction is set to be 1.3× 10⁻⁴ at the $90%$ confidence level.
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Collaboration et al. (2026) studied this question.