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-Lambda(Xi) over bar (+) + c.c. with (Xi) over bar -> (Lambda) over bar pi(+), (Lambda) over bar -> (p) over bar pi(+) pthorn 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 Ξ ¯ ++ c. c.
Garzia, I.;Gramigna, S.;
2024
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-Lambda(Xi) over bar (+) + c.c. with (Xi) over bar -> (Lambda) over bar pi(+), (Lambda) over bar -> (p) over bar pi(+) pthorn 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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