Search for the Leptonic Decay <i>d</i>⁺ →<i>e</i>⁺ Ν_e

We search for the leptonic decay D+ -> e(+)nu(e) using an e(+)e(-) collision data sample with an integrated luminosity of 20.3 fb(-1) collected with the BESIII detector at a center-of-mass energy of 3.773 GeV. Significant signal is not observed, and an upper limit on the branching fraction of D+ -> e+ nu(e) is set as 9.7x10(-7), at a confidence level of 90%. Our upper limit is an order of magnitude smaller than the previous limit for this decay mode.