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BESIII Collaboration,Ablikim, M.,Achasov, M.N.,Alberto, D.,Ambrose, D.J.,An, F.F.,An, Q.,An, Z.H.,Bai, J.Z.,Baldini Ferroli, R.B.F.,Ban, Y.,Becker, J.,Berger, N.,Bertani, M.B.,Bian, J.M.,Boger, E.,Bon North-Holland Pub. Co 2012 Physics letters: B Vol.710 No.4
We study the decays of the J/ψ and ψ<SUP>'</SUP> mesons to π<SUP>+</SUP>π<SUP>-</SUP>π<SUP>0</SUP> using data samples at both resonances collected with the BES III detector in 2009. We measure the corresponding branching fractions with unprecedented precision and provide mass spectra and Dalitz plots. The branching fraction for J/ψ→π<SUP>+</SUP>π<SUP>-</SUP>π<SUP>0</SUP> is determined to be(2.137+/-0.004 (stat.)<SUB>-0.056</SUB><SUP>+0.058</SUP> (syst.)<SUB>-0.026</SUB><SUP>+0.027</SUP> (norm.))x10<SUP>-2</SUP>, and the branching fraction for ψ<SUP>'</SUP>→π<SUP>+</SUP>π<SUP>-</SUP>π<SUP>0</SUP> is measured as(2.14+/-0.03 (stat.)<SUB>-0.07</SUB><SUP>+0.08</SUP> (syst.)<SUB>-0.08</SUB><SUP>+0.09</SUP> (norm.))x10<SUP>-4</SUP>. The J/ψ decay is found to be dominated by an intermediate ρ(770) state, whereas the ψ<SUP>'</SUP> decay is dominated by di-pion masses around 2.2 GeV/c<SUP>2</SUP>, leading to strikingly different Dalitz distributions.
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>