Based on a sample of (448.1 +/- 2.9) x 10^6 psi(3686) events collected with the BESIII detector at BEPCII, the decays of psi(3686) -> K-LambdaXibar+ + c.c. with Xibar -> Lambdabar pi+, Lambdabar -> pbar pi+ are studied. We investigate the two excited resonances, Xi(1690)- and Xi(1820)-, which are each observed with large significance (>> 10 sigma) in the K- Lambda invariant mass distributions. A partial wave analysis is performed, and the spin-parities of Xi(1690)- and Xi(1820)- are measured to be 1/2^- and 3/2^-, respectively. The masses, widths, and product branching fractions of Xi(1690)- and Xi(1820)- are also measured.
Study of excited Ξ states in ψ(3686) → K- Λ Ξbar+ + c. c.
Amoroso, A.;Bianchi, F.;Destefanis, M.;De Mori, F.;Greco, M.;Maggiora, M.;Marcello, S.;Sosio, S.;Spataro, S.;
2024-01-01
Abstract
Based on a sample of (448.1 +/- 2.9) x 10^6 psi(3686) events collected with the BESIII detector at BEPCII, the decays of psi(3686) -> K-LambdaXibar+ + c.c. with Xibar -> Lambdabar pi+, Lambdabar -> pbar pi+ are studied. We investigate the two excited resonances, Xi(1690)- and Xi(1820)-, which are each observed with large significance (>> 10 sigma) in the K- Lambda invariant mass distributions. A partial wave analysis is performed, and the spin-parities of Xi(1690)- and Xi(1820)- are measured to be 1/2^- and 3/2^-, respectively. The masses, widths, and product branching fractions of Xi(1690)- and Xi(1820)- are also measured.| File | Dimensione | Formato | |
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PhysRevD.109.072008.pdf
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