Six-quark structure of d*(2380) in a chiral constituent quark model

Six-quark structure of d*(2380) in a chiral constituent quark model The structure of d*(2380) is restudied with the single cluster structure in the chiral SU(3) quark model which has successfully been employed to explain the N-N scattering data and the binding energy of deuteron. The binding behavior of such a six quark system is solved by using a variational method. The trial wave function is chosen to be a combination of a basic spherical symmetric component of [(0s)6]orb in the orbital space with 0ℏω excitation and an inner structural deformation component of [(0s)5(1s)]orb and [(0s)4(0p)2]orb in the orbital space with 2ℏω excitation, both of which are in the spatial [6]orb symmetry. It is shown that the mass of the system is about 2356 MeV, which is qualitatively consistent with the result both from the two-cluster configuration calculation and from the data measured by the WASA Collaborations. When the meson exchange interactions are absent, the attraction is insufficient to form a stable state below the ΔΔ threshold. This result tells us that as long as the medium-range interaction due to the chiral symmetry consideration is properly introduced, the mass of the system will be reduced in a rather large extent. It also implies that the observed d* is a six-quark bound state with respect to the ΔΔ threshold, which again supports the conclusion that d* is a hexaquark dominant state. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review D American Physical Society (APS)

Six-quark structure of d*(2380) in a chiral constituent quark model

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Six-quark structure of d*(2380) in a chiral constituent quark model

Abstract

The structure of d*(2380) is restudied with the single cluster structure in the chiral SU(3) quark model which has successfully been employed to explain the N-N scattering data and the binding energy of deuteron. The binding behavior of such a six quark system is solved by using a variational method. The trial wave function is chosen to be a combination of a basic spherical symmetric component of [(0s)6]orb in the orbital space with 0ℏω excitation and an inner structural deformation component of [(0s)5(1s)]orb and [(0s)4(0p)2]orb in the orbital space with 2ℏω excitation, both of which are in the spatial [6]orb symmetry. It is shown that the mass of the system is about 2356 MeV, which is qualitatively consistent with the result both from the two-cluster configuration calculation and from the data measured by the WASA Collaborations. When the meson exchange interactions are absent, the attraction is insufficient to form a stable state below the ΔΔ threshold. This result tells us that as long as the medium-range interaction due to the chiral symmetry consideration is properly introduced, the mass of the system will be reduced in a rather large extent. It also implies that the observed d* is a six-quark bound state with respect to the ΔΔ threshold, which again supports the conclusion that d* is a hexaquark dominant 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.96.014036
Publisher site
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Abstract

The structure of d*(2380) is restudied with the single cluster structure in the chiral SU(3) quark model which has successfully been employed to explain the N-N scattering data and the binding energy of deuteron. The binding behavior of such a six quark system is solved by using a variational method. The trial wave function is chosen to be a combination of a basic spherical symmetric component of [(0s)6]orb in the orbital space with 0ℏω excitation and an inner structural deformation component of [(0s)5(1s)]orb and [(0s)4(0p)2]orb in the orbital space with 2ℏω excitation, both of which are in the spatial [6]orb symmetry. It is shown that the mass of the system is about 2356 MeV, which is qualitatively consistent with the result both from the two-cluster configuration calculation and from the data measured by the WASA Collaborations. When the meson exchange interactions are absent, the attraction is insufficient to form a stable state below the ΔΔ threshold. This result tells us that as long as the medium-range interaction due to the chiral symmetry consideration is properly introduced, the mass of the system will be reduced in a rather large extent. It also implies that the observed d* is a six-quark bound state with respect to the ΔΔ threshold, which again supports the conclusion that d* is a hexaquark dominant state.

Journal

Physical Review DAmerican Physical Society (APS)

Published: Jul 1, 2017

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