Quarkdiquark systematics of baryons and the su(6) symmetry for light states

A. V. Anisovich; V. V. Anisovich; M. A. Matveev; V. A. Nikonov; A. V. Sarantsev; T. O. Vulfs

doi:10.1142/S0217751X10049177

Quarkdiquark systematics of baryons and the su(6) symmetry for light states

A. V. Anisovich, V. V. Anisovich, M. A. Matveev, V. A. Nikonov, A. V. Sarantsev, T. O. Vulfs

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

We continue our attempts to systematize baryons, which are composed of light quarks (q = ν, d), as quark-diquark systems. The notion of two diquarks is used: (i) D₁¹, with the spin S_D = 1 and isospin I_D = 1 and (ii)₀⁰with S_D = 0 and I_D = 0. Here we try to resolve the problem of the low-lying Δ(5^-/2) states: in the last experiments the lightest state is observed at ≳2200 MeV, not at 1900-2000 MeV as it has been stated 20 years ago. We are looking for different systematization variants with the forbidden low-lying Δ(5^-/2) states in the mass region ≲2000 MeV. We see that the inclusion of the SU(6) constraints on _qD ¹₁ states with angular momentum L = 1 results in a shift of the lightest Δ(5^-/2) isobar to ∼2300 MeV. The scheme with the SU(6) constraints for low-lying _qD¹₁ and _qD₀⁰ states (with L = 0, 1) is presented in detail.

Original language	English
Pages (from-to)	3155-3171
Number of pages	17
Journal	International Journal of Modern Physics A
Volume	25
Issue number	16
DOIs	https://doi.org/10.1142/S0217751X10049177
State	Published - 30 Jun 2010
Externally published	Yes

Keywords

Quark model
baryon
diquark
systematics

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Nuclear and High Energy Physics
Astronomy and Astrophysics

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10.1142/S0217751X10049177

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title = "Quarkdiquark systematics of baryons and the su(6) symmetry for light states",

abstract = "We continue our attempts to systematize baryons, which are composed of light quarks (q = ν, d), as quark-diquark systems. The notion of two diquarks is used: (i) D11, with the spin SD = 1 and isospin ID = 1 and (ii)00with SD = 0 and ID = 0. Here we try to resolve the problem of the low-lying Δ(5-/2) states: in the last experiments the lightest state is observed at ≳2200 MeV, not at 1900-2000 MeV as it has been stated 20 years ago. We are looking for different systematization variants with the forbidden low-lying Δ(5-/2) states in the mass region ≲2000 MeV. We see that the inclusion of the SU(6) constraints on qD 11 states with angular momentum L = 1 results in a shift of the lightest Δ(5-/2) isobar to ∼2300 MeV. The scheme with the SU(6) constraints for low-lying qD11 and qD00 states (with L = 0, 1) is presented in detail.",

keywords = "Quark model, baryon, diquark, systematics",

author = "Anisovich, {A. V.} and Anisovich, {V. V.} and Matveev, {M. A.} and Nikonov, {V. A.} and Sarantsev, {A. V.} and Vulfs, {T. O.}",

note = "Funding Information: We thank L. G. Dakhno for helpful discussions. The paper was supported by the RFFI grants 07-02-01196-a and RSGSS-3628.2008.2.",

year = "2010",

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doi = "10.1142/S0217751X10049177",

language = "English",

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T1 - Quarkdiquark systematics of baryons and the su(6) symmetry for light states

AU - Anisovich, A. V.

AU - Anisovich, V. V.

AU - Matveev, M. A.

AU - Nikonov, V. A.

AU - Sarantsev, A. V.

AU - Vulfs, T. O.

N1 - Funding Information: We thank L. G. Dakhno for helpful discussions. The paper was supported by the RFFI grants 07-02-01196-a and RSGSS-3628.2008.2.

PY - 2010/6/30

Y1 - 2010/6/30

N2 - We continue our attempts to systematize baryons, which are composed of light quarks (q = ν, d), as quark-diquark systems. The notion of two diquarks is used: (i) D11, with the spin SD = 1 and isospin ID = 1 and (ii)00with SD = 0 and ID = 0. Here we try to resolve the problem of the low-lying Δ(5-/2) states: in the last experiments the lightest state is observed at ≳2200 MeV, not at 1900-2000 MeV as it has been stated 20 years ago. We are looking for different systematization variants with the forbidden low-lying Δ(5-/2) states in the mass region ≲2000 MeV. We see that the inclusion of the SU(6) constraints on qD 11 states with angular momentum L = 1 results in a shift of the lightest Δ(5-/2) isobar to ∼2300 MeV. The scheme with the SU(6) constraints for low-lying qD11 and qD00 states (with L = 0, 1) is presented in detail.

AB - We continue our attempts to systematize baryons, which are composed of light quarks (q = ν, d), as quark-diquark systems. The notion of two diquarks is used: (i) D11, with the spin SD = 1 and isospin ID = 1 and (ii)00with SD = 0 and ID = 0. Here we try to resolve the problem of the low-lying Δ(5-/2) states: in the last experiments the lightest state is observed at ≳2200 MeV, not at 1900-2000 MeV as it has been stated 20 years ago. We are looking for different systematization variants with the forbidden low-lying Δ(5-/2) states in the mass region ≲2000 MeV. We see that the inclusion of the SU(6) constraints on qD 11 states with angular momentum L = 1 results in a shift of the lightest Δ(5-/2) isobar to ∼2300 MeV. The scheme with the SU(6) constraints for low-lying qD11 and qD00 states (with L = 0, 1) is presented in detail.

KW - Quark model

KW - baryon

KW - diquark

KW - systematics

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Quarkdiquark systematics of baryons and the su(6) symmetry for light states

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