Interpretation of the newly observed Ωc0 resonances

Interpretation of the newly observed Ωc0 resonances We study the charmed and bottomed doubly strange baryons within the heavy-quark-light-diquark framework. The two strange quarks are assumed to lie in S wave and thus their total spin is 1. We calculate the mass spectra of the S- and P-wave orbitally excited states and find the Ωc0(2695) and Ωc0(2770) fit well as the S-wave states of charmed doubly strange baryons. The five newly Ωc0(X) resonances observed by the LHCb Collaboration, i.e., Ωc0(3000), Ωc0(3050), Ωc0(3066), Ωc0(3090), and Ωc0(3119), can be interpreted as the P-wave orbitally excited states. In heavy quark effective theory, we analyze their decays into the Ξc+K- and Ξc′+K-, and point out that decays of the five P-wave Ωc0 states into the Ξc+K- and Ξc′+K- are suppressed by either heavy quark symmetry or phase space. The narrowness of the five newly observed Ωc0(X) states can then be naturally interpreted with heavy quark symmetry. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review D American Physical Society (APS)

Interpretation of the newly observed Ωc0 resonances

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Interpretation of the newly observed Ωc0 resonances

Abstract

We study the charmed and bottomed doubly strange baryons within the heavy-quark-light-diquark framework. The two strange quarks are assumed to lie in S wave and thus their total spin is 1. We calculate the mass spectra of the S- and P-wave orbitally excited states and find the Ωc0(2695) and Ωc0(2770) fit well as the S-wave states of charmed doubly strange baryons. The five newly Ωc0(X) resonances observed by the LHCb Collaboration, i.e., Ωc0(3000), Ωc0(3050), Ωc0(3066), Ωc0(3090), and Ωc0(3119), can be interpreted as the P-wave orbitally excited states. In heavy quark effective theory, we analyze their decays into the Ξc+K- and Ξc′+K-, and point out that decays of the five P-wave Ωc0 states into the Ξc+K- and Ξc′+K- are suppressed by either heavy quark symmetry or phase space. The narrowness of the five newly observed Ωc0(X) states can then be naturally interpreted with heavy quark symmetry.
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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.96.014024
Publisher site
See Article on Publisher Site

Abstract

We study the charmed and bottomed doubly strange baryons within the heavy-quark-light-diquark framework. The two strange quarks are assumed to lie in S wave and thus their total spin is 1. We calculate the mass spectra of the S- and P-wave orbitally excited states and find the Ωc0(2695) and Ωc0(2770) fit well as the S-wave states of charmed doubly strange baryons. The five newly Ωc0(X) resonances observed by the LHCb Collaboration, i.e., Ωc0(3000), Ωc0(3050), Ωc0(3066), Ωc0(3090), and Ωc0(3119), can be interpreted as the P-wave orbitally excited states. In heavy quark effective theory, we analyze their decays into the Ξc+K- and Ξc′+K-, and point out that decays of the five P-wave Ωc0 states into the Ξc+K- and Ξc′+K- are suppressed by either heavy quark symmetry or phase space. The narrowness of the five newly observed Ωc0(X) states can then be naturally interpreted with heavy quark symmetry.

Journal

Physical Review DAmerican Physical Society (APS)

Published: Jul 1, 2017

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