Using a sample of 1.06x10^8 psi(3686) events produced in e+e- collisions at sqrt(s)=3.686 GeV and collected with the BESIII detector at the BEPCII collider, we present studies of the decays psi(3686)-->K-ΛΞbar+ ++c.c. and psi(3686)-->gamma K-ΛΞbar+ +c.c.. We observe two hyperons, Ξ(1690)- and Ξ(1820)-, in the K-Λ invariant mass distribution in the decay psi(3686)-->K-ΛΞbar+ +c.c. with significances of 4.9sigma and 6.2sigma, respectively. The branching fractions of psi(3686)-->K-ΛΞbar+ +c.c., psi(3686)-->K-Σ0Ξbar+ +c.c., psi(3686)-->gamma chi_cJ --> K-ΛΞbar++c.c. (J=0, 1, 2), and psi(3686)-->Ξ(1690/1820)-Ξbar+ +c.c. with subsequent decay Ξ(1690/1820)- --> K-Λ are measured for the first time.
Measurements of psi(3686) --> K-ΛΞbar+ ++ c. c. and psi(3686) -->gamma K-ΛΞbar+ ++ c. c.
Garzia, I.;
2015
Abstract
Using a sample of 1.06x10^8 psi(3686) events produced in e+e- collisions at sqrt(s)=3.686 GeV and collected with the BESIII detector at the BEPCII collider, we present studies of the decays psi(3686)-->K-ΛΞbar+ ++c.c. and psi(3686)-->gamma K-ΛΞbar+ +c.c.. We observe two hyperons, Ξ(1690)- and Ξ(1820)-, in the K-Λ invariant mass distribution in the decay psi(3686)-->K-ΛΞbar+ +c.c. with significances of 4.9sigma and 6.2sigma, respectively. The branching fractions of psi(3686)-->K-ΛΞbar+ +c.c., psi(3686)-->K-Σ0Ξbar+ +c.c., psi(3686)-->gamma chi_cJ --> K-ΛΞbar++c.c. (J=0, 1, 2), and psi(3686)-->Ξ(1690/1820)-Ξbar+ +c.c. with subsequent decay Ξ(1690/1820)- --> K-Λ are measured for the first time.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
