Linear square-mass trajectories of radially and orbitally excited hadrons in holographic QCD

Forkel, Hilmar; Frederico, T.; Beyer, Michael

doi:10.1088/1126-6708/2007/07/077

Cited by 130 publications

(156 citation statements)

References 94 publications

(199 reference statements)

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“…[9,15,18,20,22,24,25], where the mass spectrum of light and heavy baryons, and electromagnetic and gravitational form factors have been calculated. We should stress that during last years significant progress in understanding of baryon structure using methods of AdS/QCD has been achieved [20,[26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Nucleon structure including high Fock states in AdS/QCD

et al. 2012

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We present a detailed analysis of nucleon electromagnetic and axial form factors in a holographic soft-wall model. This approach is based on an action which describes hadrons with broken conformal invariance and incorporates confinement through the presence of a background dilaton field. For Nc = 3 we describe the nucleon structure in a superposition of a three valence quark state with high Fock states including an adjustable number of partons (quarks, antiquarks and gluons) via studying the dynamics of 5D fermion fields of different scaling dimension in anti-de Sitter (ADS) space. According to the gauge/gravity duality the 5D fermion fields of different scaling dimension correspond to the Fock state components with a specific number of partons. In the present application we restrict to the contribution of 3, 4 and 5 parton components in the nucleon Fock state. With a minimal number of free parameters (dilaton scale parameter, mixing parameters of partial contributions of Fock states, coupling constants in the effective Lagrangian) we achieve a reasonable agreement with data for the nucleon form factors.

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Section: Introductionmentioning

confidence: 99%

Nucleon structure including high Fock states in AdS/QCD

et al. 2012

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“…On the other side, solutions to Rarita -Schwinger equation in AdS space are more difficult to get, but its spectrum is similar to the Dirac case, as you can see for example in Ref. [3]. As is possible to see in Fig 2, again the results are somewhat high, but using A = 1.01GeV 2 , adjusted to ∆ resonances gives better results.…”

Section: Some Hadronic Spectrummentioning

confidence: 71%

“…When m 5 R is constant, the spectra obtained doesn't have Regge behavior. Since in this case the dilaton field cannot improve the situation with respect to hard wall models, it is necessary to try other possibilities, for example a trivial dilaton but with a family of metrics [3,9], or consider an AdS metric with different dilaton and include anomalous dimension for the operators that create the hadrons, as considered in [5].…”

Section: Spectra Of Hadrons In Ads / Qcdmentioning

confidence: 99%

“…We consider hadrons with n quarks (and / or antiquarks) and m gluons. Column M U was calculated using A = 1.1GeV 2 , the universal Regge slope used in this work, while M contains the results obtained using A = 0.9GeV 2 , a value fixed from nucleon data [3]. …”

Section: Some Hadronic Spectrummentioning

confidence: 99%

“…At present a dual to QCD is unknown, but a simple approach known as BottomUp has been quite successful in several concrete QCD applications, such as in hadronic scattering processes [1], hadronic spectra [2,3,4,5], hadronic couplings and chiral symmetry breaking [6], mesonic wave function [7], among other applications.…”

Section: Introductionmentioning

confidence: 99%

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Hadronic spectra in AdS∕QCD correspondence

Vega¹,

Schmidt²,

Alarcón³

et al. 2010

AIP Conference Proceedings

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Bacchetta¹,

Cotogno²,

Pasquini³

2017

Light Cone 2015

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We present a study of the pion structure in the context of the AdS/QCD soft-wall model. This approach provides the light-front wave function of the pion in terms of a set of parameters that we fit to available experimental information on the electromagnetic form factor and parton distribution of the pion. We discuss the corresponding predictions for the unpolarized transverse momentum dependent parton distribution of the pion. 1 Introduction AdS/QCD correspondence with soft-wall holographic models has been employed in a number of recent works to get new insights on hadronic physics [1-4]. Remarkably, light-front holographic QCD methods (see [5] and references therein for a complete review on the topic) have provided expressions for the light-front wave function (LFWF) of a meson valence Fock state [6,7]. This allows one to obtain direct information about many hadronic observables, which can be expressed in terms of overlaps of LFWFs. The outline of this work is as follows: In Sect. 2 we consider the expressions for the pion LFWF derived in [6,7]. We introduce the quark masses in a Lorentz invariant way and derive analytical expressions for the pion valence Parton Distribution Function (PDF) and electromagnetic Form Factor. We determine the free parameters of the LFWFs by fitting simultaneously the available experimental information on form factor and valence PDF. In Sect. 3, we discuss the corresponding predictions for the pion unpolarized valence Transverse Momentum Dependent parton distribution function (TMD). In the final section, we summarize the results. 2 The Pion LFWF The LFWFs in the soft-wall model of the AdS/QCD correspondence were originally derived in two different matching procedures [6,7].

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Linear square-mass trajectories of radially and orbitally excited hadrons in holographic QCD

Cited by 130 publications

References 94 publications

Nucleon structure including high Fock states in AdS/QCD

Nucleon structure including high Fock states in AdS/QCD

Hadronic spectra in AdS∕QCD correspondence

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