A new diquark model for deep inelastic structure functions

Fredriksson, Sverker; Jändel, Magnus; Larsson, Tomas I.

doi:10.1007/bf01547961

Cited by 48 publications

(10 citation statements)

References 18 publications

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“…The study is also motivated by the "diquark picture" of hadrons [18,19,20,21]. The diquark is made of two quarks which are strongly correlated in color anti-triplet3 channel, where the one-gluon-exchange interaction between two quarks is most attractive.…”

Section: Introductionmentioning

confidence: 99%

Scalar-quark systems and chimera hadrons inSU(3)clattice QCD

2007

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where the scalar-quark field φ a (x) (a=1,2,3) belongs to the fundamental (3 c ) representation of SU(3) c . In above equations, a, b and c denote the color indices, and ǫ abc is the antisymmetric tensor for color indices. Here, we have generally introduced different species of scalar-quarks, which leads to the "scalar-quark flavor" degrees of freedom. In Eqs.(1) and (2), i, j and k denote the scalarquark flavor indices, and Γ ij M and Γ ijk B are some tensors on the scalar-quark flavor. We note that, for the localoperator description of scalar-quark baryons, the number N scalar f of the scalar-quark flavor should be N scalar f ≥ 3. Actually, for N scalar f ≤ 2, the local scalar-quark baryon operator vanishes due to the antisymmetric tensor ǫ abc , although a non-local operator description is possible for scalar-quark baryons. In contrast, scalar-quark mesons can be described with local operators at any number of N scalar f (≥ 1). We call the color-singlet state made of scalar-quarks φ and (ordinary) quarks ψ as a "chimera hadron": chimera mesons φ † ψ and chimera baryons, ψψφ and φφψ. The chimera meson field C α M (x) and the chimera baryon field,

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Section: Introductionmentioning

confidence: 99%

Scalar-quark systems and chimera hadrons inSU(3)clattice QCD

2007

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“…In [9,10,11], baryons were described as quark-diquark systems. In hard processes on nucleons (or nuclei), the coherent qq state (composite diquark) can be responsible for interactions in the region of large Bjorken-x values, at x ∼ 2/3; deep inelastic scatterings were considered in the framework of such an approach in [12,13,14,15,16]. More detailed considerations of the diquarks and their applications to different processes may be found in [17,18,19].…”

Section: Introductionmentioning

confidence: 99%

Quark-diquark systematics of baryons: Spectral integral equations for systems composed by light quarks

Anisovich¹,

Anisovich²,

Matveev³

et al. 2011

Phys. Atom. Nuclei

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“…In [2,3,4], baryons were described as quark-diquark systems. In hard processes on nucleons (or nuclei), the coherent qq state (composite diquark) can be responsible for interactions in the region of large Bjorken-x values, at x ∼ 2/3; deep inelastic scatterings were considered in the framework of such an approach in [5,6,7,8,9]. More detailed considerations of the diquark and the applications to different processes may be found in [10,11,12].…”

Section: Introductionmentioning

confidence: 99%

SEARCHING FOR THE QUARK–DIQUARK SYSTEMATICS OF BARYONS COMPOSED BY LIGHT QUARKS q = u, d

Anisovich

Matveev

et al. 2010

Int. J. Mod. Phys. A

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Supposing quark-diquark structure of baryons, we look for systematics of baryons composed of light quarks (q = u, d). We systematize baryons using the notion of two diquarks: (i) axial-vector state, D 1 1 , with the spin S D = 1 and isospin I D = 1 and (ii) scalar one, D 0 0 , with the spin S D = 0 and isospin I D = 0. We consider several schemes for the composed baryons: (1) with different diquark masses,and overlapping qD 0 0 and qD 1 1 states (resonances), (3) with/without SU (6) constraints for low-lying states (with quark-diquark orbital momenta L = 0). In the high-mass region the model predicts several baryon resonances at M ∼ 2.0 − 2.9 GeV. Moreover, the model gives us the double pole structure (i.e. two poles with the same ReM but different ImM ) in many amplitudes at masses M > ∼ 2.0 GeV. We see also that for description of low-lying baryons (with L = 0), the SU (6) constraint is needed. * anisovic@thd.pnpi.spb.ru

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A new diquark model for deep inelastic structure functions

Cited by 48 publications

References 18 publications

Scalar-quark systems and chimera hadrons inSU(3)clattice QCD

Scalar-quark systems and chimera hadrons inSU(3)clattice QCD

Quark-diquark systematics of baryons: Spectral integral equations for systems composed by light quarks

SEARCHING FOR THE QUARK–DIQUARK SYSTEMATICS OF BARYONS COMPOSED BY LIGHT QUARKS q = u, d

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