Deuteron electromagnetic structure functions and polarization properties in soft-wall AdS/QCD

Gutsche, Thomas; Lyubovitskij, Valery E.; Schmidt, Iván

doi:10.1103/physrevd.94.116006

Cited by 22 publications

(20 citation statements)

References 21 publications

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“…al. [48,49,50] have shown that the electromagnetic form factors for the deuteron in the soft-wall AdS/QCD model are well in agreement with the experimental data and the form factors display correct 1/Q 10 power scaling for large Q 2 which is consistent with the quark counting rules. Thus, it is very interesting to investigate the transverse charge densities, gravitational form factors and longitudinal momentum densities, GPDs for the deuteron in the framework of soft-wall AdS/QCD.…”

Section: Introductionsupporting

confidence: 71%

“…and normalization For the derivation of the deuteron electromagnetic form factors in the framework of soft-wall AdS/QCD we follow the works of Gutsche et al [48,49,50]. For a hadronic bound state, the twist which is defined as dimension − spin, can also be written as τ = n p where n p is the number of partons in a bound state [55,56,57,83].…”

Section: Deuteron Form Factorsmentioning

confidence: 99%

“…In the soft-wall AdS/QCD framework, the deuteron electromagnetic form factors G 1,2,3 (Q 2 ) can be expressed in terms of the universal form factor F (Q 2 ) such as [48,49] …”

Section: Deuteron Form Factorsmentioning

confidence: 99%

“…There are many theoretical approaches such as chiral effective and phenomenological approaches, perturbative QCD, potential and quark models, holographic QCD models etc. which have been extensively used to investigate the deuteron form factors [1,2,3,4,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50] whereas the generalized parton distributions (GPDs) for deuteron has been introduced in [51]. GPDs for the deuteron have been studied based on a phenomenological effective Lagrangian approach in [52].…”

Section: Introductionmentioning

confidence: 99%

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Deuteron transverse densities in holographic QCD

2017

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Abstract. We investigate the transverse charge density in the longitudinally as well as transversely polarized deuteron using the recent empirical description of the deuteron electromagnetic form factors in the framework of holographic QCD. The predictions of the holographic QCD are compared with the results of a standard phenomenological parameterization. In addition, we evaluate GPDs and the gravitational form factors for the deuteron. The longitudinal momentum densities are also investigated in the transverse plane. PACS

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Section: Introductionsupporting

confidence: 71%

Section: Deuteron Form Factorsmentioning

confidence: 99%

“…In the soft-wall AdS/QCD framework, the deuteron electromagnetic form factors G 1,2,3 (Q 2 ) can be expressed in terms of the universal form factor F (Q 2 ) such as [48,49] …”

Section: Deuteron Form Factorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Deuteron transverse densities in holographic QCD

2017

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“…Light-Front Holography predicts not only meson and baryon spectroscopy successfully, but also hadron dynamics, including vector meson electroproduction, hadronic lightfront wavefunctions, distribution amplitudes, form factors, and valence structure functions. The application to the deuteron elastic form factors and structure functions is given in [30,31].…”

Section: Light-front Holographymentioning

confidence: 99%

Color Confinement, Hadron Dynamics, and Hadron Spectroscopy from Light-Front Holography and Superconformal Algebra

Brodsky

2018

Advances in High Energy Physics

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The QCD light-front Hamiltonian equation LF |Ψ⟩ = 2 |Ψ⟩ derived from quantization at fixed LF time = + / provides a causal, frame-independent method for computing hadron spectroscopy as well as dynamical observables such as structure functions, transverse momentum distributions, and distribution amplitudes. The QCD Lagrangian with zero quark mass has no explicit mass scale. de Alfaro, Fubini, and Furlan (dAFF) have made an important observation that a mass scale can appear in the equations of motion without affecting the conformal invariance of the action if one adds a term to the Hamiltonian proportional to the dilatation operator or the special conformal operator. If one applies the dAFF procedure to the QCD light-front Hamiltonian, it leads to a color-confining potential 4 2 for mesons, where 2 is the LF radial variable conjugate to the invariant mass squared. The same result, including spin terms, is obtained using light-front holography, the duality between light-front dynamics and AdS 5 , if one modifies the AdS 5 action by the dilatonin the fifth dimension . When one generalizes this procedure using superconformal algebra, the resulting light-front eigensolutions provide a unified Regge spectroscopy of meson, baryon, and tetraquarks, including remarkable supersymmetric relations between the masses of mesons and baryons and a universal Regge slope. The pion eigenstate has zero mass at 푞 = 0. The superconformal relations also can be extended to heavy-light quark mesons and baryons. This approach also leads to insights into the physics underlying hadronization at the amplitude level. I will also discuss the remarkable features of the Poincaré invariant, causal vacuum defined by light-front quantization and its impact on the interpretation of the cosmological constant. AdS/QCD also predicts the analytic form of the nonperturbative running couplingThe mass scale underlying hadron masses can be connected to the parameter Λ MS in the QCD running coupling by matching the nonperturbative dynamics to the perturbative QCD regime. The result is an effective coupling 푠 (2 ) defined at all momenta. One obtains empirically viable predictions for spacelike and timelike hadronic form factors, structure functions, distribution amplitudes, and transverse momentum distributions. Finally, I address the interesting question of whether the momentum sum rule is valid for nuclear structure functions.

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Hadron Spectroscopy and Dynamics from Light-Front Holography and Superconformal Algebra

Brodsky

2018

Few-Body Syst

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QCD is not supersymmetrical in the traditional sense -the QCD Lagrangian is based on quark and gluonic fields, not squarks nor gluinos. However, its hadronic eigensolutions conform to a representation of superconformal algebra, reflecting the underlying conformal symmetry of chiral QCD and its Pauli matrix representation. The eigensolutions of superconformal algebra provide a unified Regge spectroscopy of meson, baryon, and tetraquarks of the same parity and twist as equal-mass members of the same 4-plet representation with a universal Regge slope. The pion qq eigenstate has zero mass for m q = 0. The superconformal relations also can be extended to heavy-light quark mesons and baryons. The combined approach of light-front holography and superconformal algebra also provides insight into the origin of the QCD mass scale and color confinement. A key observation is the remarkable dAFF principle which shows how a mass scale can appear in the Hamiltonian and the equations of motion while retaining the conformal symmetry of the action. When one applies the dAFF procedure to chiral QCD, a mass scale κ appears which determines universal Regge slopes, hadron masses in the absence of the Higgs coupling, and the mass parameter underlying the Gaussian functional form of the nonperturbative QCD running coupling: α s (Q 2 ) ∝ exp −(Q 2 /4κ 2 ), in agreement with the effective charge determined from measurements of the Bjorken sum rule. The mass scale κ underlying hadron masses can be connected to the parameter Λ M S in the QCD running coupling by matching its predicted nonperturbative form to the perturbative QCD regime. The result is an effective coupling α s (Q 2 ) defined at all momenta. One also obtains empirically viable predictions for spacelike and timelike hadronic form factors, structure functions, distribution amplitudes, and transverse momentum distributions.

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Deuteron electromagnetic structure functions and polarization properties in soft-wall AdS/QCD

Cited by 22 publications

References 21 publications

Deuteron transverse densities in holographic QCD

Deuteron transverse densities in holographic QCD

Color Confinement, Hadron Dynamics, and Hadron Spectroscopy from Light-Front Holography and Superconformal Algebra

Hadron Spectroscopy and Dynamics from Light-Front Holography and Superconformal Algebra

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