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Measurements of psi(3686) -> K-Lambda(Xi)over-bar(+) + c.c. and psi(3686) -> gamma K-Lambda(Xi)over-bar(+) + c.c.
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2015 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 91, no 9, 092006Article in journal (Refereed) Published
Abstract [en]

Using a sample of 1.06 x 10(8) psi(3686) events produced in e(+)e(-) collisions at root s = 3.686 GeV and collected with the BESIII detector at the BEPCII collider, we present studies of the decays psi(3686) -> K-Lambda(Xi) over bar (+) + c.c. and psi(3686) -> gamma K-Lambda(Xi) over bar (+) + c.c. We observe two hyperons, Xi(1690)(-) and Xi(1820)(-), in the K-Lambda invariant mass distribution in the decay psi(3686) -> K-Lambda(Xi) over bar (+) + c.c. with significances of 4.9 sigma and 6.2 sigma, respectively. The branching fractions of psi(3686) -> K-Lambda(Xi) over bar (+) + c.c., psi(3686) -> K-Sigma(0)(Xi) over bar (+) + c.c, psi(3686) -> gamma chi cJ -> gamma K-Lambda(Xi) over bar (+) + c.c (J = 0, 1, 2), and psi(3686) -> Xi(1690/1820)(-)(Xi) over bar (+) + c.c with sub-sequent decay Xi(1690/1820)(-) -> K-Lambda are measured for the first time.

Place, publisher, year, edition, pages
2015. Vol. 91, no 9, 092006
National Category
Physical Sciences
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URN: urn:nbn:se:uu:diva-256838DOI: 10.1103/PhysRevD.91.092006ISI: 000354927200002OAI: oai:DiVA.org:uu-256838DiVA: diva2:827194
Available from: 2015-06-26 Created: 2015-06-26 Last updated: 2017-12-04Bibliographically approved

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Johansson, TordKupsc, AndrezejPettersson, JoachimSchönning, KarinWolke, Magnus

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