Electromagnetic form factors of the ϱ meson in a light-front constituent quark model

Cardarelli, F.; Grach, I.L.; Narodetskii, I.M.; Salmè, G.; Simula, Silvano

doi:10.1016/0370-2693(95)00230-i

Cited by 107 publications

(127 citation statements)

References 20 publications

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“…(2)). We use, as before [4,8,5], a constituent quark mass value of m = 0.22 GeV in the numerical evaluation of the form factors and p = 3 for the power-law model. The relative weight parameter λ, the momentum scales β and β 1 of the different models are found from the proton magnetic momentum and the experimental ratio µ p G Ep /G M p [13,14].…”

Section: Numerical Resultsmentioning

confidence: 99%

“…Table I: (a) (circle with black dot) and (b) (gray circle). Results of BT calculations from [3] (diamonds) and from [4] (triangles). Experimental data (full square).…”

Section: Numerical Resultsmentioning

confidence: 99%

“…It is well known that in light-front models of the nucleon with point-like quarks, the proton and neutron magnetic moments are not reproduced simultaneously without further assumptions [1,2,3,4]. More recently, it was shown that in several nucleon light-front models, the proton and neutron magnetic moments are strongly correlated [5].…”

Section: Introductionmentioning

confidence: 99%

“…[5], the coupling of the quark to the nucleon fields was formulated through an effective Lagrangian, which dials the different relativistic spin coupling schemes. Although some of the previous calculations [2,3,4] were performed within the BakamjianThomas construction (BT) [6] of the nucleon light-front wave function, the results found for the magnetic moments were consistent with those obtained with an effective Lagrangian with mixed scalar plus gradient coupling [5]. In fact, it was pointed out that the BT and the mixed scalar plus gradient effective Lagrangian constructions of the spin wave function provides the same form when the free mass of the three-quark system is identified with the nucleon plus momentum component [7].…”

Section: Introductionmentioning

confidence: 99%

“…It was shown by [4], that the pion and the nucleon lightfront wave functions present hard-constituent components, i.e., high momentum tails, above 1 GeV/c, due to the shortrange attractive part of the interaction in the spin singlet state, as taken from the Godfrey and Isgur model [8]. Consequently, the nucleon wave function can exhibit a higher momentum tail related to short ranged physics of the constituent quarks.…”

Section: Introductionmentioning

confidence: 99%

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Nucleon magnetic moments in light-front models with quark mass asymmetries

et al. 2004

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Section: Numerical Resultsmentioning

confidence: 99%

“…Table I: (a) (circle with black dot) and (b) (gray circle). Results of BT calculations from [3] (diamonds) and from [4] (triangles). Experimental data (full square).…”

Section: Numerical Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nucleon magnetic moments in light-front models with quark mass asymmetries

et al. 2004

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Lattice Charge Overlap I. Elastic Limit of Pi and Rho Mesons

Andersen

Wilcox

1997

Annals of Physics

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Using lattice QCD on a 16 3 × 24 lattice at β = 6.0, we examine the elastic limit of charge overlap functions in the quenched approximation for the pion and rho meson; results are compared to previous direct current insertion calculations. A good signal is seen for the pion, but the electric and magnetic rho meson results are considerably noisier. We find that the pion and rho results are characterized by a monopole mass to rho mass ratio of 0.97 (8) and 0.73(10), respectively. Assuming the functional form of the electric and magnetic form factors are the same, we also find a rho meson g-factor of g = 2.25(34), consistent with the nonrelativistic quark model.

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Melo¹,

Tsushima²

2018

Light Cone 2016

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Properties of ρ-meson in symmetric nuclear matter are investigated within a light-front constituent quark model (LFCQM), using the in-medium input calculated by the quark-meson coupling (QMC) model. The LFCQM used here was previously applied in vacuum to calculate the ρ-meson electromagnetic properties, namely, charge G 0 , magnetic G 1 , and quadrupole G 2 form factors, as well as the electromagnetic radius and decay constant. We predict the in-medium modifications of the ρ-meson electromagnetic form factors in symmetric nuclear matter.Keywords Light-front, Constituent quark model, Electromagnetic form factors, ρ-meson, symmetric nuclear matter 1 IntroductionOne of the main objectives in hadronic physics is to understand the hadron structure in terms of the fundamental degrees of freedom in quantum chromodynamics (QCD), i.e, quarks and gluons. The Standard Model (SM) of elementary particles includes QCD as the strong interaction sector. Although solving QCD is an important part for understanding the SM of the particles physics, it is still a very difficult task (see Refs. [1; 2] for QCD details).On the other hand, light-front approach is an alternative to calculate observables with the ingredients from QCD [3]. With light-front quantum field theory, it is possible to describe the lower Fock components of the hadronic bound-state wave functions, i.e, mesons and baryons in terms of quarks and gluons [3; 4; 5; 6; 7; 8].In the present work the previous model for the ρ-meson in vacuum [9; 10; 11] is used to calculate the in-medium electromagnetic observables such as the electromagnetic form factors, charge G 0 , magnetic G 2 , and quadrupole G 2 , as well as the electromagnetic radius and decay constant, using the plus-component of the current J µ applied in symmetric nuclear matter [12]. (For a review of the in-medium properties of hadrons, see e.g., Refs. [13;14].) Next, we present the light-front model of ρ-meson, and briefly review the main ingredients of the model.

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Electromagnetic form factors of the ϱ meson in a light-front constituent quark model

Cited by 107 publications

References 20 publications

Nucleon magnetic moments in light-front models with quark mass asymmetries

Nucleon magnetic moments in light-front models with quark mass asymmetries

Lattice Charge Overlap I. Elastic Limit of Pi and Rho Mesons

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