$q\bar q$ LOOP EFFECTS ON BARYON MASSES

Morel, Danielle; Capstick, Simon

doi:10.1142/9789812704887_0057

Cited by 14 publications

(21 citation statements)

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“…For example, this phenomenon, which can even be expressed in models that omit confinement [1][2][3], is responsible for the remarkably small value of the ratio ofand -meson masses and, inseparable from this, the generation of large constituent-like masses for dressed-quarks. It follows both: That a sum of constituent-like dressed-quark masses sets a baseline for the masses of all light hadrons, except the pseudoscalar mesons; and that pseudoscalar "meson cloud" contributions are essential to an understanding of hadron observables, such as the masses [4,5] and form factors [6] of octet and decuplet baryons.…”

Section: Introductionmentioning

confidence: 99%

Aspects and consequences of a dressed-quark-gluon vertex

et al. 2004

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Features of the dressed-quark-gluon vertex and their role in the gap and Bethe-Salpeter equations are explored. It is argued that quenched lattice data indicate the existence of net attraction in the colour-octet projection of the quark-antiquark scattering kernel. This attraction affects the uniformity with which solutions of truncated equations converge pointwise to solutions of the complete gap and vertex equations. For current-quark masses less than the scale set by dynamical chiral symmetry breaking, the dependence of the dressed-quark-gluon vertex on the current-quark mass is weak. The study employs a vertex model whose diagrammatic content is explicitly enumerable. That enables the systematic construction of a vertex-consistent Bethe-Salpeter kernel and thereby an exploration of the consequences for the strong interaction spectrum of attraction in the colour-octet channel. With rising current-quark mass the rainbow-ladder truncation is shown to provide an increasingly accurate estimate of a bound state's mass. Moreover, the calculated splitting between vector and pseudoscalar meson masses vanishes as the current-quark mass increases, which argues for the mass of the pseudoscalar partner of the \Upsilon(1S) to be above 9.4 GeV. The absence of colour-antitriplet diquarks from the strong interaction spectrum is contingent upon the net amount of attraction in the octet projected quark-antiquark scattering kernel. There is a window within which diquarks appear. The amount of attraction suggested by lattice results is outside this domain.Comment: 22 pages, 12 figure

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Section: Introductionmentioning

confidence: 99%

Aspects and consequences of a dressed-quark-gluon vertex

et al. 2004

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“…[15]. A study of the dressed masses of N and ∆ ground and Pwave excited baryons [22] which involves intermediate pseudoscalar and vector ground-state mesons and many intermediate baryons (ground states, and N , ∆, Λ, Σ, Σ * excited states up to the second band of negative-parity states at roughly 2100 MeV), representing hundreds of intermediate states, is underway. Vertex form factors are calculated analytically using mixed relativized-model [23] wave functions and the 3 P 0 model [24].…”

Section: Dressing and Undressing Scattering Matrix Singularities 21 mentioning

confidence: 99%

“…As an example, in Ref. [22] the strong coupling parameter α 0 s was reduced in order to take into account the additional ∆ − N splitting in the sums over baryon-meson loops contributing to the self energies of both of these states. Similarly, in their calculation of these effects in mesons, Geiger and Isgur [14] showed that the formation of an intermediate meson pair was equivalent to string breaking, which has the effect of renormalizing the meson string tension.…”

Section: Dressing and Undressing Scattering Matrix Singularities 21 mentioning

confidence: 99%

The physical meaning of scattering matrix singularities in coupled-channel formalisms⋆

et al. 2008

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“…where g α B (| k|) is obtained by the phenomenological QPC model [76][77][78][79][80][81][82] in which the bare cs core (B) couples with the D ( * ) K channels (α) through the creation of the light quark pair with the quantum number J P C = 0 ++ .…”

mentioning

confidence: 99%

“…where γ is a free parameter containing the creation probability of the quark-antiquark pair. The exponential form factor with the cutoff Λ is introduced to truncate the hard vertices given by usual QPC model [81,82]. The spatial transform factor I α B (| k|) is calculated with the exact wave functions obtained by our new fit using the GI model.…”

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confidence: 99%

Novel coupled channel framework connecting quark model and lattice QCD: an investigation on near-threshold $D_s$ states

Yang,

Wang,

et al. 2021

Preprint

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A novel framework is proposed to extract near-threshold resonant states from finite-volume energy levels of lattice QCD and is applied to elucidate structures of the positive parity Ds. The quark model, the quark-pair-creation mechanism and D ( * ) K interaction are incorporated into the Hamiltonian effective field theory. The bare 1 + cs states are almost purely given by the states with heavy-quark spin bases. The physical D * s0 (2317) and D * s1 (2460) are the mixtures of bare cs core and D ( * ) K component, while the D * s1 (2536) and D * s2 (2573) are almost dominated by bare cs. Furthermore, our model reproduces the clear level crossing of the D * s1 (2536) with the scattering state at a finite volume.

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$q\bar q$ LOOP EFFECTS ON BARYON MASSES

Cited by 14 publications

References 0 publications

Aspects and consequences of a dressed-quark-gluon vertex

Aspects and consequences of a dressed-quark-gluon vertex

The physical meaning of scattering matrix singularities in coupled-channel formalisms⋆

Novel coupled channel framework connecting quark model and lattice QCD: an investigation on near-threshold $D_s$ states

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