Ablikim, M.Achasov, M. N.Adlarson, P.Albrecht, M.Aliberti, R.Amoroso, A.Çetin, Serkant Ali2024-05-192024-05-1920222470-00102470-0029https://doi.org10.1103/PhysRevD.106.112004https://hdl.handle.net/20.500.12713/5787We present the first search for the semileptonic decay D-s(+) -> pi(0)e(+)nu(e) using a data sample of electron-positron collisions recorded with the BESIII detector at center-of-mass energies between 4.178 and 4.226 GeV, corresponding to an integrated luminosity of 6.32 fb(-1). This decay is expected to be sensitive to pi(0)-eta mixing. No significant signal is observed. We set an upper limit of 6.4 x 10(-5) on the branching fraction at the 90% confidence level.eninfo:eu-repo/semantics/openAccess[No Keywords]Article10611WOS:0008989234000022-s2.0-85144940484Q110.1103/PhysRevD.106.112004Q1