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Search for the rare decay of ψ(3686)→Λc+p¯e+e−+c.c. at BESIII
Ablikim, M.,Achasov, M. N.,Ahmed, S.,Albrecht, M.,Alekseev, M.,Amoroso, A.,An, F. F.,An, Q.,Bai, J. Z.,Bai, Y.,Bakina, O.,Baldini Ferroli, R.,Ban, Y.,Begzsuren, K.,Bennett, D. W.,Bennett, J. V.,Berger American Physical Society 2018 Physical review. D Vol.97 No.9
<P>Based on a data sample of (448.1 +/- 2.9) x 10(6)Psi(3686) decays collected with the BESIII experiment, a search for the flavor changing neutral current transition Psi(3686) -> Lambda(+)(c) pe(+) e(-) + c.c. is performed for the first time. No signal candidates are observed and the upper limit on the branching fraction of Psi(3686) -> Lambda(+)(c) pe(+) e(-) is determined to be 1.7 x 10(-6) at the 90% confidence level. The result is consistent with expectations from the standard model, and no evidence for new physics is found.</P>