Strong couplings and form factors of charmed mesons in holographic QCD

Ballon-Bayona, Alfonso; Krein, G.; Miller, Carlisson

doi:10.1103/physrevd.96.014017

Cited by 34 publications

(34 citation statements)

References 72 publications

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“…9 for the two gluon propagators respectively D I and D II . Most of the numerical results are of the order of magnitude of the experimental data, < r 2 ρ > exp 0.28 − 0.56fm 2 [48,49], except the numerical results obtained with the gluon propagator D I for which the values are divided by a factor 10 By considering the gluon propagator I from Ref. [35,43] the expressions for g com va−j (Q1, Q2 = +Q1/2) and g com va−j (Q1, Q2 = −Q1/2) are plotted respectively in solid thick line and dashed thick line; g tr va−j (Q1, Q2 = +Q1/2) and g tr va−j (Q1, Q2 = −Q1/2) are plotted respectively in solid line and dashed line.…”

Section: A Form Factorsmentioning

confidence: 82%

Light vector and axial mesons effective couplings to constituent quarks

Braghin¹

2018

Phys. Rev. D

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Low energy effective couplings of baryons' constituent quarks to light vector and axial mesons are derived by considering quark polarization for a dressed one gluon exchange quark interaction. The quark field is splitted into two components, one for background constituent quarks and another one for quark-antiquark states, light mesons and the scalar chiral condensate. By considering a large quark effective mass derivative expansion, several effective coupling constants are resolved as functions of the original model parameters and of components of the quark and gluon propagators. Besides the leading single vector meson-constituent quark gauge-type effective coupling, several twovector and axial mesons-constituent quark couplings are also obtained in the next leading order. Among these, vector and axial mesons mixings induced by constituent quark currrents are found. Approximated and exact ratios between the effective coupling constants in the limit of very large quark effective mass and numerical estimates are exhibitted. Numerical results of the corresponding form factors and of the (strong) vector meson quadratic radius are also presented.I.

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Section: A Form Factorsmentioning

confidence: 82%

Light vector and axial mesons effective couplings to constituent quarks

Braghin¹

2018

Phys. Rev. D

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“…The uncertainty is due to the uncertainty of the experimental value of the decay constant f exp ρ = (152 ± 8) MeV [36,37]. The calculation of [6] schematically can be presented as a chain : 20) and the obtained value r 2 ρ = (0.56 ± 0.04) fm 2 one can consider as a theoretical extraction of the experimental value (see, e.g., [38]).…”

Section: The ρ-Meson Magnetic Moment In πAndρ Model Results and Dmentioning

confidence: 99%

Magnetic moment of the ρ meson in instant-form relativistic quantum mechanics

Krutov¹,

Polezhaev²,

Troitsky³

2018

Phys. Rev. D

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We derive an explicit analytical expression for the magnetic dipole moment of the ρ meson, μ ρ , in a relativistic constituent-quark model. We adopt our relativistic approach to composite systems, modified instant-form (mIF) relativistic quantum mechanics (RQM), that we used particularly to construct a unified π & ρ model [Phys. Rev. D 93, 036007 (2016)] describing electroweak properties of light mesons. This model provides a parameter-free calculation to give μ ρ ¼ 2.16 AE 0.03 ½e/2M ρ which is in accordance with the conventional experimental data. The magnetic, quadrupole, and charge form factors also are derived and presented. We consider the small uncertainty of our value of the magnetic moment as one of the undoubted advantages of the method. A comparison is made with recent lattice QCD results and previous calculations using a variety of methods.

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“…This approach is similar to the one used in the holographic model for chiral symmetry breaking[11,12] where the quark masses and chiral condensates are fixed by the meson masses and decay constants. See also[13,14].…”

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confidence: 99%

Effective holographic models for QCD: Glueball spectrum and trace anomaly

et al. 2018

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We investigate effective holographic models for QCD arising from five dimensional Dilaton-Gravity. The models are characterized by a dilaton with a mass term in the UV, dual to a CFT deformation by a relevant operator, and quadratic in the IR. The UV constraint leads to the explicit breaking of conformal symmetry whereas the IR constraint guarantees linear confinement. We propose semi-analytic interpolations between the UV and the IR and obtain a spectrum for scalar and tensor glueballs consistent with lattice QCD data. We use the glueball spectrum as a physical constraint to find the evolution of the model parameters as the mass term goes to zero. Finally, we reproduce the universal result for the trace anomaly of deformed CFTs and propose a dictionary between this result and the QCD trace anomaly. A nontrivial consequence of this dictionary is the emergence of a β function similar to the two-loop perturbative QCD result.

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Strong couplings and form factors of charmed mesons in holographic QCD

Cited by 34 publications

References 72 publications

Light vector and axial mesons effective couplings to constituent quarks

Light vector and axial mesons effective couplings to constituent quarks

Magnetic moment of the ρ meson in instant-form relativistic quantum mechanics

Effective holographic models for QCD: Glueball spectrum and trace anomaly

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