Theoretical description of the decays Λb→Λ(*)(12±,32±)+J/ψ

Theoretical description of the decays Λb→Λ(*)(12±,32±)+J/ψ We calculate the invariant and helicity amplitudes for the transitions Λb→Λ(*)(JP)+J/ψ, where the Λ(*)(JP) are Λ(sud)-type ground and excited states with JP quantum numbers JP=12±, 32±. The calculations are performed in the framework of a covariant confined quark model previously developed by us. We find that the values of the helicity amplitudes for the Λ*(1520,32-) and the Λ*(1890,32+) are suppressed compared with those for the ground state Λ(1116,12+) and the excited state Λ*(1405,12-). This analysis is important for the identification of the hidden charm pentaquark states Pc+(4380) and Pc+(4450) which were discovered in the decay chain Λb0→Pc+(→pJ/ψ)+K- because the cascade decay chain Λb→Λ*(32±)(→pK-)+J/ψ involves the same final state. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review D American Physical Society (APS)

Theoretical description of the decays Λb→Λ(*)(12±,32±)+J/ψ

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Theoretical description of the decays Λb→Λ(*)(12±,32±)+J/ψ

Abstract

We calculate the invariant and helicity amplitudes for the transitions Λb→Λ(*)(JP)+J/ψ, where the Λ(*)(JP) are Λ(sud)-type ground and excited states with JP quantum numbers JP=12±, 32±. The calculations are performed in the framework of a covariant confined quark model previously developed by us. We find that the values of the helicity amplitudes for the Λ*(1520,32-) and the Λ*(1890,32+) are suppressed compared with those for the ground state Λ(1116,12+) and the excited state Λ*(1405,12-). This analysis is important for the identification of the hidden charm pentaquark states Pc+(4380) and Pc+(4450) which were discovered in the decay chain Λb0→Pc+(→pJ/ψ)+K- because the cascade decay chain Λb→Λ*(32±)(→pK-)+J/ψ involves the same final state.
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Publisher
The American Physical Society
Copyright
Copyright © © 2017 American Physical Society
ISSN
1550-7998
eISSN
1550-2368
D.O.I.
10.1103/PhysRevD.96.013003
Publisher site
See Article on Publisher Site

Abstract

We calculate the invariant and helicity amplitudes for the transitions Λb→Λ(*)(JP)+J/ψ, where the Λ(*)(JP) are Λ(sud)-type ground and excited states with JP quantum numbers JP=12±, 32±. The calculations are performed in the framework of a covariant confined quark model previously developed by us. We find that the values of the helicity amplitudes for the Λ*(1520,32-) and the Λ*(1890,32+) are suppressed compared with those for the ground state Λ(1116,12+) and the excited state Λ*(1405,12-). This analysis is important for the identification of the hidden charm pentaquark states Pc+(4380) and Pc+(4450) which were discovered in the decay chain Λb0→Pc+(→pJ/ψ)+K- because the cascade decay chain Λb→Λ*(32±)(→pK-)+J/ψ involves the same final state.

Journal

Physical Review DAmerican Physical Society (APS)

Published: Jul 1, 2017

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