Ablikim, M.Achasov, M. N.Adlarson, P.Albrecht, M.Aliberti, R.Çetin, Serkant AliKolcu, Onur Buğra2023-01-262023-01-262022Ablikim, M., Achasov, M. N., Adlarson, P., Albrecht, M., Aliberti, R., Amoroso, A., ... & Jiang, X. S. (2022). Measurement of ψ (3686)→ Λ Λ¯ η and ψ (3686)→ Λ Λ¯ π 0 decays. Physical Review D, 106(7), 072006.2470-00102470-0029http://dx.doi.org/10.1103/PhysRevD.106.072006https://hdl.handle.net/20.500.12713/3836Based on a sample of 448.1 x 10(6) psi(3686) events collected with the BESIII detector, a study of psi(3686) -> Lambda(Lambda) over bar pi(0) and psi(3686) -> Lambda(Lambda) over bar eta is performed. Evidence of the isospin-violating decay psi(3686) -> Lambda(Lambda) over bar pi(0) is found for the first time with a statistical significance of 3.7 sigma, the branching fraction B(psi(3686) -> Lambda(Lambda) over bar pi(0)) is measured to be (1.42 +/- 0.39 +/- 0.59) x 10(-6), and its corresponding upper limit is determined to be 2.47 x 10(-6) at 90% confidence level. A partial wave analysis of psi(3686) -> Lambda(Lambda) over bar eta shows that the peak around Lambda eta invariant mass threshold favors a Lambda* resonance with mass and width in agreement with the Lambda(1670). The branching fraction of the psi(3686) -> Lambda(Lambda) over bar eta is measured to be (2.34 +/- 0.18 +/- 0.52) x 10(-5). The first uncertainties are statistical and the second are systematic.eninfo:eu-repo/semantics/openAccessArticle1067WOS:000898697100003Q110.1103/PhysRevD.106.072006