Hidden-charm pentaquarks as a meson-baryon molecule with coupled channels for D¯(*)Λc and D¯(*)Σc(*)

Hidden-charm pentaquarks as a meson-baryon molecule with coupled channels for D¯(*)Λc and... The recent observation of two hidden-charm pentaquark states by LHCb collaborations prompted us to investigate the exotic states close to the D¯Λc, D¯*Λc, D¯Σc, D¯Σc*, D¯*Σc and D¯*Σc* thresholds. We therefore studied the hadronic molecules that form the coupled-channel system of D¯(*)Λc and D¯(*)Σc(*). As the heavy quark spin symmetry manifests the mass degenerations of D¯ and D¯* mesons, and of Σc and Σc* baryons, the coupled channels of D¯(*)Σc(*) are important in these molecules. In addition, we consider the coupling to the D¯(*)Λc channel whose thresholds are near the D¯(*)Σc(*) thresholds, and the coupling to the state with nonzero orbital angular momentum mixed by the tensor force. This full coupled-channel analysis of D¯(*)Λc-D¯(*)Σc(*) with larger orbital angular momentum has never been performed before. By solving the coupled-channel Schrödinger equations with the one meson exchange potentials with respect to the heavy quark spin and chiral symmetries, we studied the hidden-charm hadronic molecules with I(JP)=1/2(3/2±) and 1/2(5/2±). We conclude that the JP assignment of the observed pentaquarks is 3/2+ for Pc+(4380) and 5/2- for Pc+(4450), which is in agreement with the results of the LHCb analysis. In addition, we give predictions for other JP=3/2± states at 4136.0, 4307.9 and 4348.7 MeV in JP=3/2-, and 4206.7 MeV in JP=3/2+, which can be further investigated by means of experiment. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review D American Physical Society (APS)

Hidden-charm pentaquarks as a meson-baryon molecule with coupled channels for D¯(*)Λc and D¯(*)Σc(*)

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Hidden-charm pentaquarks as a meson-baryon molecule with coupled channels for D¯(*)Λc and D¯(*)Σc(*)

Abstract

The recent observation of two hidden-charm pentaquark states by LHCb collaborations prompted us to investigate the exotic states close to the D¯Λc, D¯*Λc, D¯Σc, D¯Σc*, D¯*Σc and D¯*Σc* thresholds. We therefore studied the hadronic molecules that form the coupled-channel system of D¯(*)Λc and D¯(*)Σc(*). As the heavy quark spin symmetry manifests the mass degenerations of D¯ and D¯* mesons, and of Σc and Σc* baryons, the coupled channels of D¯(*)Σc(*) are important in these molecules. In addition, we consider the coupling to the D¯(*)Λc channel whose thresholds are near the D¯(*)Σc(*) thresholds, and the coupling to the state with nonzero orbital angular momentum mixed by the tensor force. This full coupled-channel analysis of D¯(*)Λc-D¯(*)Σc(*) with larger orbital angular momentum has never been performed before. By solving the coupled-channel Schrödinger equations with the one meson exchange potentials with respect to the heavy quark spin and chiral symmetries, we studied the hidden-charm hadronic molecules with I(JP)=1/2(3/2±) and 1/2(5/2±). We conclude that the JP assignment of the observed pentaquarks is 3/2+ for Pc+(4380) and 5/2- for Pc+(4450), which is in agreement with the results of the LHCb analysis. In addition, we give predictions for other JP=3/2± states at 4136.0, 4307.9 and 4348.7 MeV in JP=3/2-, and 4206.7 MeV in JP=3/2+, which can be further investigated by means of experiment.
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Publisher
American Physical Society (APS)
Copyright
Copyright © © 2017 American Physical Society
ISSN
1550-7998
eISSN
1550-2368
D.O.I.
10.1103/PhysRevD.96.014018
Publisher site
See Article on Publisher Site

Abstract

The recent observation of two hidden-charm pentaquark states by LHCb collaborations prompted us to investigate the exotic states close to the D¯Λc, D¯*Λc, D¯Σc, D¯Σc*, D¯*Σc and D¯*Σc* thresholds. We therefore studied the hadronic molecules that form the coupled-channel system of D¯(*)Λc and D¯(*)Σc(*). As the heavy quark spin symmetry manifests the mass degenerations of D¯ and D¯* mesons, and of Σc and Σc* baryons, the coupled channels of D¯(*)Σc(*) are important in these molecules. In addition, we consider the coupling to the D¯(*)Λc channel whose thresholds are near the D¯(*)Σc(*) thresholds, and the coupling to the state with nonzero orbital angular momentum mixed by the tensor force. This full coupled-channel analysis of D¯(*)Λc-D¯(*)Σc(*) with larger orbital angular momentum has never been performed before. By solving the coupled-channel Schrödinger equations with the one meson exchange potentials with respect to the heavy quark spin and chiral symmetries, we studied the hidden-charm hadronic molecules with I(JP)=1/2(3/2±) and 1/2(5/2±). We conclude that the JP assignment of the observed pentaquarks is 3/2+ for Pc+(4380) and 5/2- for Pc+(4450), which is in agreement with the results of the LHCb analysis. In addition, we give predictions for other JP=3/2± states at 4136.0, 4307.9 and 4348.7 MeV in JP=3/2-, and 4206.7 MeV in JP=3/2+, which can be further investigated by means of experiment.

Journal

Physical Review DAmerican Physical Society (APS)

Published: Jul 1, 2017

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