Baryon octet electromagnetic form factors in a confining NJL model

Carrillo-Serrano, Manuel E.; Bentz, Wolfgang; Cloët, Ian C.; Thomas, A. W.

doi:10.1016/j.physletb.2016.05.065

Cited by 27 publications

(39 citation statements)

References 96 publications

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“…This is reflected in the result for its magnetic moment, thus showing the importance of including the spin-3/2 states in order to obtain a result compatible with the experiment. We note that our agreement with the data seems to be overall slightly better than that found in some other approaches, such as relativistic quark models [61] and Nambu-Jona-Lasinio calculations [68]. Furthermore, the LECs appear to be more stable when including the decuplet: b D almost does not change, b F gets reduced to approximately half.…”

Section: A Magnetic Momentssupporting

confidence: 46%

“…In order to get an idea about the dependence of the results on the renormalization used, it is useful to calculate the (3), a quark-model (QM) approach [61], and a calculation within the Nambu-Jona-Lasinio (NJL) model [68].…”

Section: A Magnetic Momentsmentioning

confidence: 99%

“…In order to be able to reproduce the behaviour observed at higher photon virtualities, one needs to find a theoretical approach which describes the complex-plane singularities as well. This question has been studied within dispersion analyses [55][56][57][58], quark models [59][60][61] and with lattice QCD [62][63][64][65][66], among other approaches [67][68][69]. In the present work we use the methods of ChPT to answer the same question.…”

mentioning

confidence: 97%

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Systematic study of octet-baryon electromagnetic form factors in covariant chiral perturbation theory

Blin

2017

Phys. Rev. D

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We perform a complete and systematic calculation of the octet-baryon form factors within the fully covariant approach of SU (3) chiral perturbation theory at O(p 3 ). We use the extended on-mass shell renormalization scheme, and include explicitly the vector mesons and the spin-3/2 decuplet intermediate states. Comparing these predictions with data including magnetic moments, charges, and magnetic radii, we determine the unknown low-energy constants, and give predictions for yet unmeasured observables, such as the magnetic moment of the Σ 0 , and the charge and magnetic radii of the hyperons. I. INTRODUCTIONThe electromagnetic structure of hadrons plays a fundamental role in our understanding of the structure of matter and the underlying strong interaction. At high energies, the fundamental properties of hadrons are well described by perturbative quantum chromodynamics (pQCD). However, in order to describe interactions at distances larger than the size of hadrons, corresponding to energies well below 1 GeV, pQCD breaks down, and suitable low-energy effective-field theories (EFTs) are useful. This energy regime is the focus of this paper, and we use the methods of fully covariant SU (3) baryon chiral perturbation theory (ChPT) for our description of the hadron properties [1-3]. We use this EFT of QCD including explicitly the decuplet of spin-3/2 baryons [4][5][6][7] and the vector-meson contributions [8][9][10][11][12][13].At each order in the chiral expansion, the interactions are parameterized by a set of low-energy constants (LECs), many of which have already been determined from data. When including baryons in ChPT, the chiral power counting in terms of momenta and masses seems to be spoiled [2]. This is due to the baryon masses being of the order of 1 GeV. As a result, a priori there is no clear way to associate a specific chiral order with a definite number of loops. Several renormalization schemes to solve this issue have been proposed in the past. The first such approach is semirelativistic, which exploits that the baryons are much heavier than the Goldstone bosons, and hence an expansion in the inverse baryon mass is made. This is called heavy-baryon ChPT (HBChPT), first introduced in Ref. [4]. Covariant approaches are slightly more involved, and resum terms of higher order from the HBChPT viewpoint. The infrared regularization (IR) scheme separates the loops into infrared and regular parts, obtained by a manipulation of the baryon propagators [14][15][16][17]. The regular parts fully encode the power-counting breaking terms (PCBTs), and are thus absorbed in the LECs of the most general Lagrangians. This approach is based on the works in Refs. [18,19]. However, we choose the extended on-mass shell (EOMS) scheme [20,21], which is known to converge well for a range of processes [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]. This scheme relies on the knowledge that the PCBTs that spoil the chiral series have fully analytical expressions. Therefore, they can be identified with terms of the ...

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Section: A Magnetic Momentssupporting

confidence: 46%

Section: A Magnetic Momentsmentioning

confidence: 99%

mentioning

confidence: 97%

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Systematic study of octet-baryon electromagnetic form factors in covariant chiral perturbation theory

Blin

2017

Phys. Rev. D

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“…For example, the rainbow-ladder truncation becomes a vector-vector contact interaction and in the quark-diquark equation an additional static approximation for the exchange quark propagator is made. The NJL model was recently employed to calculate elastic nucleon and hyperon form factors [346,507], building upon a body of work on other structure properties such as parton distribution functions and nuclear medium effects; see also [508] and references therein. Closely related is the contactinteraction model developed in Refs.…”

Section: B Kinematics Andmentioning

confidence: 99%

“…For example, a reduction of the Bethe-Salpeter equation by using instantaneous interactions was used in [628,629] to study electromagnetic form factors of octet hyperon resonances. A reduction to a quark-diquark system has been used in [507] within an NJL model for the interactions and in the covariant spectator formalism in [630]. In the latter the emphasis was placed on studying the role of pion cloud effects in form factors.…”

Section: Hyperon Form Factorsmentioning

confidence: 99%

Baryons as relativistic three-quark bound states

Eichmann

Sanchis-Alepuz

Williams

et al. 2016

Progress in Particle and Nuclear Physics

438

530

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We review the spectrum and electromagnetic properties of baryons described as relativistic three-quark bound states within QCD. The composite nature of baryons results in a rich excitation spectrum, whilst leading to highly non-trivial structural properties explored by the coupling to external (electromagnetic and other) currents. Both present many unsolved problems despite decades of experimental and theoretical research. We discuss the progress in these fields from a theoretical perspective, focusing on nonperturbative QCD as encoded in the functional approach via Dyson-Schwinger and Bethe-Salpeter equations. We give a systematic overview as to how results are obtained in this framework and explain technical connections to lattice QCD. We also discuss the mutual relations to the quark model, which still serves as a reference to distinguish 'expected' from 'unexpected' physics. We confront recent results on the spectrum of non-strange and strange baryons, their form factors and the issues of two-photon processes and Compton scattering determined in the DysonSchwinger framework with those of lattice QCD and the available experimental data. The general aim is to identify the underlying physical mechanisms behind the plethora of observable phenomena in terms of the underlying quark and gluon degrees of freedom.

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Hidden-charm and bottom tetra- and pentaquarks with strangeness in the hadro-quarkonium and compact tetraquark models

Ferretti

Santopinto

2020

J. High Energ. Phys.

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In two recent papers, we used the hadro-quarkonium model to study the properties of hiddencharm and bottom tetraquarks and pentaquarks. Here, we extend the previous results and calculate the masses of heavy-quarkonium-kaon/hyperon systems. We also compute the spectrum of hiddencharm and bottom tetraquarks with strangeness in the compact tetraquark (diquark-antidiquark) model. If heavy-light exotic systems with non-null strangeness content were to be observed experimentally, it might be possible to distinguish among the large variety of available theoretical pictures for tetra-and pentaquark states and, possibly, rule out those which are not compatible with the data. * jacopo.j.ferretti@jyu.fi † santopinto@ge.infn.it FIG. 1: Schematic representation of heavy-light hadroquarkonium (right) and compact tetraquark (left) states. bsbn J P C N [(SD, SD)S, L]J E th [MeV] J P C N [(SD, SD)S, L]J E th [MeV] J P C N [(SD, SD)S, L]J E th [MeV]

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Baryon octet electromagnetic form factors in a confining NJL model

Cited by 27 publications

References 96 publications

Systematic study of octet-baryon electromagnetic form factors in covariant chiral perturbation theory

Systematic study of octet-baryon electromagnetic form factors in covariant chiral perturbation theory

Baryons as relativistic three-quark bound states

Hidden-charm and bottom tetra- and pentaquarks with strangeness in the hadro-quarkonium and compact tetraquark models

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