Diquark correlations in hadron physics: Origin, impact and evidence

Barabanov, M. Yu.; Bedolla, Marco A.; Brooks, W. K.; Cates, G. D.; Chen, C.; Chen, Y.; Cisbani, E.; Ding, M.; Eichmann, Gernot; Ent, R.; Ferretti, J.; Gothe, R. W.; Horn, T.; Liuti, Simonetta; Mezrag, Cédric; Pilloni, A.; Puckett, A. J. R.; Roberts, Craig D.; Rossi, P.; Salmè, G.; Santopinto, E.; Segovia, Jorge; Syritsyn, Sergey; Takizawa, Makoto; Tomasi–Gustafsson, E.; Wein, Philipp; Wojtsekhowski, B.

doi:10.1016/j.ppnp.2020.103835

Cited by 134 publications

(76 citation statements)

References 543 publications

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“…However, that requires additional intervention because one must, by-hand, force zeros into what would otherwise be momentum-independent Faddeev amplitudes [55]. A potentially more worthwhile direction would be to adapt the framework to the challenge of understanding tetra-and penta-quark states [5,6].…”

Section: Discussionmentioning

confidence: 99%

“…The empirical hadron spectrum is rich [1], even without including the array of recently discovered exotic states [2][3][4][5][6]. Yet, contemporary theory still predicts more states than have been observed.…”

Section: Introductionmentioning

confidence: 99%

“…During the past decade, continuum Schwinger function methods, particularly Dyson-Schwinger equations, have 0123456789(). : V,-vol increasingly been used in spectrum calculations following improvements in both [5,[33][34][35][36][37]: (i) understanding the capacities and limitations of the approach; and (ii) the quality and range of the description of hadron properties. Recently, predictions for meson and baryon spectra in some of the low-lying flavour-SU(N f = 5) multiplets were delivered [38,39].…”

Section: Introductionmentioning

confidence: 99%

“…3. They are important because soft diquarks seemingly play an important role in hadron structure [5]; hence, serve usefully in developing a quark + diquark approximation to the baryon three-body problem [51][52][53][54].…”

Section: Introductionmentioning

confidence: 99%

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Masses of positive- and negative-parity hadron ground-states, including those with heavy quarks

et al. 2021

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A symmetry-preserving treatment of a vector $$\times $$ × vector contact interaction is used to compute spectra of ground-state $$J^P = 0^\pm , 1^\pm $$ J P = 0 ± , 1 ± $$(f{\bar{g}})$$ ( f g ¯ ) mesons, their partner diquark correlations, and $$J^P=1/2^\pm , 3/2^\pm $$ J P = 1 / 2 ± , 3 / 2 ± (fgh) baryons, where $$f,g,h \in \{u,d,s,c,b\}$$ f , g , h ∈ { u , d , s , c , b } . Results for the leptonic decay constants of all mesons are also obtained, including scalar and pseudovector states involving heavy quarks. The spectrum of baryons produced by this chiefly algebraic approach reproduces the 64 masses known empirically or computed using lattice-regularised quantum chromodynamics with an accuracy of 1.4(1.2)%. It also has the richness of states typical of constituent-quark models and predicts many baryon states that have not yet been observed. The study indicates that dynamical, nonpointlike diquark correlations play an important role in all baryons; and, typically, the lightest allowed diquark is the most important component of a baryon’s Faddeev amplitude.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Masses of positive- and negative-parity hadron ground-states, including those with heavy quarks

et al. 2021

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“…A merit of this approach is that, by enabling a largely algebraic treatment of relevant processes and quantities, it provides for an insightful assessment of all results. Moreover, when considered judiciously [33][34][35][36][37][38][39][40], such results may often be interpreted from a QCD perspective because this treatment of the CI preserves many qualities of the leading-order truncation of QCD's Dyson-Schwinger equations (DSEs), itself a sound approach to many hadron observables [41][42][43][44][45][46][47].…”

Section: Introductionmentioning

confidence: 99%

Contact interaction analysis of pion GTMDs

et al. 2021

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A contact interaction is used to calculate an array of pion twist-two, -three and -four generalised transverse light-front momentum dependent parton distribution functions (GTMDs). Despite the interaction’s simplicity, many of the results are physically relevant, amongst them a statement that GTMD size and shape are largely prescribed by the scale of emergent hadronic mass. Moreover, proceeding from GTMDs to generalised parton distributions, it is found that the pion’s mass distribution form factor is harder than its electromagnetic form factor, which is harder than the gravitational pressure distribution form factor; the pressure in the neighbourhood of the pion’s core is commensurate with that at the centre of a neutron star; the shear pressure is maximal when confinement forces become dominant within the pion; and the spatial distribution of transversely polarised quarks within the pion is asymmetric. Regarding transverse momentum dependent distribution functions, their magnitude and domain of material support decrease with increasing twist. The simplest Wigner distribution associated with the pion’s twist-two dressed-quark GTMD is sharply peaked on the kinematic domain associated with valence-quark dominance; has a domain of negative support; and broadens as the transverse position variable increases in magnitude.

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Diquark properties from full QCD lattice simulations

Francis

Forcrand

Lewis

et al. 2022

J. High Energ. Phys.

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We study diquarks on the lattice in the background of a static quark, in a gauge-invariant formalism with quark masses down to almost physical mπ. We determine mass differences between diquark channels as well as diquark-quark mass differences. The lightest and next-to-lightest diquarks have “good” scalar, $$ {\overline{3}}_F $$ 3 ¯ F , $$ {\overline{3}}_c $$ 3 ¯ c , JP = 0+, and “bad” axial vector, 6F, $$ {\overline{3}}_c $$ 3 ¯ c , JP = 1+, quantum numbers, and a bad-good mass difference for ud flavors, 198(4) MeV, in excellent agreement with phenomenological determinations. Quark-quark attraction is found only in the “good” diquark channel. We extract a corresponding diquark size of ∼ 0.6 fm and perform a first exploration of the “good” diquark shape, which is shown to be spherical. Our results provide quantitative support for modeling the low-lying baryon spectrum using good light diquark effective degrees of freedom.

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Diquark correlations in hadron physics: Origin, impact and evidence

Cited by 134 publications

References 543 publications

Masses of positive- and negative-parity hadron ground-states, including those with heavy quarks

Masses of positive- and negative-parity hadron ground-states, including those with heavy quarks

Contact interaction analysis of pion GTMDs

Diquark properties from full QCD lattice simulations

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