Decay constants of the pion and its excitations in holographic QCD

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

doi:10.1103/physrevd.91.065024

Cited by 25 publications

(25 citation statements)

References 44 publications

(55 reference statements)

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“…a slice of the full 3D wave function, in the non-relativistic limit. To visualize the full 3D wave function, one may rotate the density plot along the vertical axis at k ⊥ = 0, applying a phase factor exp(im θ) as necessary 7 . To facilitate the visualization in 3D, we also plot the real part of the wave functions in the transverse plane at x = 0.5 in Fig.…”

Section: A Light-front Wave Functionsmentioning

confidence: 99%

Quarkonium as a relativistic bound state on the light front

Yang¹,

Maris²,

Vary³

2017

Phys. Rev. D

121

257

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We study charmonium and bottomonium as relativistic bound states in a light-front quantized Hamiltonian formalism. The effective Hamiltonian is based on light-front holography.We use a recently proposed longitudinal confinement to complete the soft-wall holographic potential for the heavy flavors. The spin structure is generated from the one-gluon exchange interaction with a running coupling. The adoption of asymptotic freedom improves the spectroscopy compared with previous light-front results. Within this model, we compute the mass spectroscopy, decay constants and the r.m.s. radii. We also present a detailed study of the obtained light-front wave functions and use the wave functions to compute the lightcone distributions, specifically the distribution amplitudes and parton distribution functions. Overall, our model provides a reasonable description of the heavy quarkonia.

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Section: A Light-front Wave Functionsmentioning

confidence: 99%

Quarkonium as a relativistic bound state on the light front

Yang¹,

Maris²,

Vary³

2017

Phys. Rev. D

121

257

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“…As observed in [38], the simplest method for extracting the leptonic decay constants is to replace the fields in the r.h.s of the dual currents prescription, Eqs. (19)- (21), by their Kaluza-Klein expansions in Eqs.…”

Section: Decay Constants Csb and Fsbmentioning

confidence: 99%

“…Moreover, by combining the formalism of Kaluza-Klein expansions and the AdS/CFT dictionary, we are able to directly extract the leptonic decay constants of mesons and find an expansion for the flavor currents that relate flavor symmetry breaking to the appearance of scalar modes. That relation bears a strong analogy with the generalized PCAC (partially conserved axial current relation) [36,37] that relates dynamical chiral symmetry breaking to the appearance of the pion and its resonances [38].…”

Section: Introductionmentioning

confidence: 99%

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Strong couplings and form factors of charmed mesons in holographic QCD

2017

Self Cite

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We extend the two-flavor hard-wall holographic model of Erlich, Katz, Son and Stephanov [Phys. Rev. Lett. 95, 261602 (2005)] to four flavors to incorporate strange and charm quarks. The model incorporates chiral and flavor symmetry breaking and provides a reasonable description of masses and weak decay constants of a variety of scalar, pseudoscalar, vector and axial-vector strange and charmed mesons. In particular, we examine flavor symmetry breaking in the strong couplings of the ρ meson to the charmed D and D * mesons. We also compute electromagnetic form factors of the π, ρ, K, K * , D and D * mesons. We compare our results for the D and D * mesons with lattice QCD data and other nonperturbative approaches.

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“…LF holography have been used to study the structure of hadron properties, such as the hadron mass spectrum, parton distribution functions, meson and baryon form factors etc. [8,30,32,[34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50]. In particular, the formalism was recently applied to the study of the nucleon [51][52][53][54][55][56][57] and Roper [31,32,58] electromagnetic structure.…”

mentioning

confidence: 99%

Valence quark contributions for the γ*N→N(1440) form factors from light-front holography

Ramalho

Melnikov

2018

Phys. Rev. D

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The structure of the nucleon and the first radial excitation of the nucleon, the Roper, Nð1440Þ, is studied within the formalism of light-front holography. The nucleon elastic form factors and γ Ã N → Nð1440Þ transition form factors are calculated under the assumption of the dominance of the valence quark degrees of freedom. Contrary to the previous studies, the bare parameters of the model associated with the valence quark are fixed by the empirical data for large momentum transfer (Q 2 ) assuming that the corrections to the three-quark picture (meson cloud contributions) are suppressed. The γ Ã N → Nð1440Þ transition form factors are then calculated without any adjustable parameters. Our estimates are compared with results from models based on valence quarks and others. The model compares well with the γ Ã N → Nð1440Þ transition form factor data, suggesting that meson cloud effects are not large, except in the region Q 2 < 1.5 GeV 2 . In particular, the meson cloud contributions for the Pauli form factor are small.

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Decay constants of the pion and its excitations in holographic QCD

Cited by 25 publications

References 44 publications

Quarkonium as a relativistic bound state on the light front

Quarkonium as a relativistic bound state on the light front

Strong couplings and form factors of charmed mesons in holographic QCD

Valence quark contributions for the γ*N→N(1440) form factors from light-front holography

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