Revisiting the Ω(2012) as a hadronic molecule and its strong decays

Recently, the Belle collaboration measured the ratios of the branching fractions of the newly observed Ω ( 2012 ) excited state. They did not observe significant signals for the Ω ( 2012 ) → K ¯ Ξ ∗ ( 1530 ) → K ¯ π Ξ decay, and reported an upper limit for the ratio of the three body decay to the tw...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2020-05, Vol.80 (5), Article 361
Main Authors: Lu, Jun-Xu, Zeng, Chun-Hua, Wang, En, Xie, Ju-Jun, Geng, Li-Sheng
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics and Cosmology
Collaboration
Decay
Elementary Particles
Hadrons
Heavy Ions
Measurement Science and Instrumentation
Nuclear Energy
Nuclear Physics
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Regular Article - Theoretical Physics
String Theory
Wave interaction
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Summary:Recently, the Belle collaboration measured the ratios of the branching fractions of the newly observed Ω ( 2012 ) excited state. They did not observe significant signals for the Ω ( 2012 ) → K ¯ Ξ ∗ ( 1530 ) → K ¯ π Ξ decay, and reported an upper limit for the ratio of the three body decay to the two body decay mode of Ω ( 2012 ) → K ¯ Ξ . In this work, we revisit the newly observed Ω ( 2012 ) from the molecular perspective where this resonance appears to be a dynamically generated state with spin-parity 3 / 2 - from the coupled channels interactions of the K ¯ Ξ ∗ ( 1530 ) and η Ω in s -wave and K ¯ Ξ in d -wave. With the model parameters for the d -wave interaction, we show that the ratio of these decay fractions reported recently by the Belle collaboration can be easily accommodated.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-020-7944-4