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

Thomas Gutsche, Mikhail A. Ivanov, Jürgen G. Körner, Valery E. Lyubovitskij, Vladimir V. Lyubushkin, Pietro Santorelli

Research output: Contribution to journalArticle

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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 languageEnglish
Article number013003
JournalPhysical Review D
Volume96
Issue number1
DOIs
Publication statusPublished - 1 Jul 2017

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ground state
decay
quark models
quantum numbers
excitation
cascades

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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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 journalArticle

Gutsche, Thomas ; Ivanov, Mikhail A. ; Körner, Jürgen G. ; Lyubovitskij, Valery E. ; Lyubushkin, Vladimir V. ; Santorelli, Pietro. / Theoretical description of the decays Λb → Λ (∗) (12 ±, 32 ±)+J /ψ THEORETICAL DESCRIPTION of the DECAYS THOMAS GUTSCHE et al. In: Physical Review D. 2017 ; Vol. 96, No. 1.
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