Theoretical description of the decays Λb → Λ (∗) (12 ±, 32 ±)+J /ψ THEORETICAL DESCRIPTION of the DECAYS THOMAS GUTSCHE et al.

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.

Original language	English
Article number	013003
Journal	Physical Review D
Volume	96
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevD.96.013003
Publication status	Published - 1 Jul 2017

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1103/PhysRevD.96.013003

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Gutsche, T., Ivanov, M. A., Körner, J. G., Lyubovitskij, V. E., Lyubushkin, V. V., & Santorelli, P. (2017). Theoretical description of the decays Λb → Λ (∗) (12 ±, 32 ±)+J /ψ THEORETICAL DESCRIPTION of the DECAYS THOMAS GUTSCHE et al. Physical Review D, 96(1), [013003]. https://doi.org/10.1103/PhysRevD.96.013003

Theoretical description of the decays Λb → Λ (∗) (12 ±, 32 ±)+J /ψ THEORETICAL DESCRIPTION of the DECAYS THOMAS GUTSCHE et al. / Gutsche, Thomas; Ivanov, Mikhail A.; Körner, Jürgen G.; Lyubovitskij, Valery E.; Lyubushkin, Vladimir V.; Santorelli, Pietro.

In: Physical Review D, Vol. 96, No. 1, 013003, 01.07.2017.

Research output: Contribution to journal › Article

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title = "Theoretical description of the decays Λb → Λ (∗) (12 ±, 32 ±)+J /ψ THEORETICAL DESCRIPTION of the DECAYS THOMAS GUTSCHE et al.",

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.",

author = "Thomas Gutsche and Ivanov, {Mikhail A.} and K{\"o}rner, {J{\"u}rgen G.} and Lyubovitskij, {Valery E.} and Lyubushkin, {Vladimir V.} and Pietro Santorelli",

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AU - Gutsche, Thomas

AU - Ivanov, Mikhail A.

AU - Körner, Jürgen G.

AU - Lyubovitskij, Valery E.

AU - Lyubushkin, Vladimir V.

AU - Santorelli, Pietro

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N2 - 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.

AB - 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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