Quark–meson coupling model based upon the Nambu–Jona Lasinio model

Whittenbury, D. L.; Carrillo-Serrano, Manuel E.; Thomas, A. W.

doi:10.1016/j.physletb.2016.09.057

Cited by 7 publications

(10 citation statements)

References 41 publications

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“…The NJL model has been used as a complementary model to the MIT bag model in the variants of the QMC model in Ref. [73]. With similar motivation, we have studied the inmedium kaon properties in the NJL model using the in-medium inputs calculated by the QMC model.…”

Section: Discussionmentioning

confidence: 99%

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Electroweak properties of pions in a nuclear medium

Hutauruk

Tsushima

2019

Phys. Rev. C

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Kaon electroweak properties in symmetric nuclear matter are studied in the Nambu-Jona-Lasinio model using the proper-time regularization. The valence quark properties in symmetric nuclear matter are calculated in the quark-meson coupling model, and they are used as inputs for studying the in-medium kaon properties in the NJL model. We evaluate the kaon decay constant, kaon-quark coupling constant, and K + electromagnetic form factor by two different approaches. Namely, by two different ways of calculating the in-medium constituent quark masses of the light quarks. We predict that, in both approaches, the kaon decay constant and kaon-quark coupling constant decrease as nuclear density increases, while the K + charge radius increases by 20-25% at normal nuclear density. * parada.hutauruk@apctp.org † kazuo.tsushima@gmail.com following reasons; (i) the constituent quark masses in vacuum are the input parameters in Ref.[32], but it is preferable to calculate them dynamically, (ii) the vacuum in the light-front approach is generally believed to be "trivial", and there is no clearly defined quark chiral condensates in the light-front approach. Thus, the model does not have the dynamical chiral symmetry breaking mechanism nor does the model have direct connection with the emergence of (pseudo-)Goldstone bosons such as kaons, and (iii) the in-medium kaon decay constant as well as the kaon-quark coupling constant are assumed to be density-independent. The purpose of the present work is to improve further the work of Ref. [32]. We extend the approach used for studying the pion properties in symmetric nuclear matter in Ref. [33], and study the in-medium kaon properties using the Nambu-Jona-Lasinio (NJL) model [34,35], supplemented by the QMC model inputs. The NJL model is a powerful chiral effective quark theory of low-energy QCD. Importantly, the model describes the dynamical chiral symmetry breaking, the origin of the pseudoscalar Goldstone bosons such as pions and kaons. Furthermore, the model satisfies the chiral limit as QCD dictates. Thus, the NJL model, which has several improved aspects as addressed above, is suitable to study the in-medium kaon properties.The experimental evidences, such as the EMC effect [36,37] and the observed modifications of bound proton EMFFs at JLab [38], suggest that the internal structure of hadrons would be modified in a nuclear medium. The phenomena of inmedium modifications of hadron properties [39][40][41][42][43][44][45][46][47][48][49][50] are tightly connected with partial restoration of chiral symmetry [51][52][53][54]. The order parameters of chiral symmetry in QCD are the lightquark chiral condensates, and their changes are expected to be one of the most important driving forces for the change of hadron properties in a nuclear medium.Spontaneous breaking of chiral symmetry generates the nonet of massless pseudoscalar Goldstone bosons. But the explicit breaking of U(1) axial symmetry selectively shifts up the η 0 -singlet mass, leaving the SU(3) flavor octet of pions, K-mesons, and...

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Section: Discussionmentioning

confidence: 99%

“…Note that the expression of M * q is different from that in Refs. [72,73], since the information of "nucleon" Fermi momentum and nuclear matter saturation properties are included in m * q (and V l ω ) calculated in the QMC model, and we should drop the density dependent term.…”

Section: B Kaon Properties In the Njl Modelmentioning

confidence: 99%

Electroweak properties of pions in a nuclear medium

Hutauruk

Tsushima

2019

Phys. Rev. C

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“…where m N (m Y ) is the free nucleon (hyperon) mass. Note that the dependence of these coupling strengths on the applied scalar field (σ) must be calculated self-consistently within the quark model [92,93,94,98,99,100,101,102]. Hence, unlike quantum hadrodynamics (QHD) [95,96], even though g Y σ (σ)/g σ (σ) may be 2/3 or 1/3 depending on the number of light quarks n q in the hyperon in free space, σ = 0 (even this is true only when their bag radii in free space are exactly the same), this will not necessarily be the case in a nuclear medium.…”

Section: Nuclear Matter and Finite (Hyper)nucleusmentioning

confidence: 99%

“…In the standard QMC model [92,94], the MIT bag model is used for describing nucleons and hyperons (hadrons). The use of this quark model is an essential ingredient for the QMC model, as similar results can be obtained using the Nambu-Jona-Lasinio model [102] or a constituent quark model [103].…”

Section: Hadron Masses In Nuclear Mattermentioning

confidence: 99%

Nuclear-bound quarkonia and heavy-flavor hadrons

Krein

Thomas

Tsushima

2018

Progress in Particle and Nuclear Physics

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In our quest to win a deeper understanding of how QCD actually works, the study of the binding of heavy quarkonia and heavy-flavor hadrons to atomic nuclei offers enormous promise. Modern experimental facilities such as FAIR, Jefferson Lab at 12 GeV and J-PARC offer exciting new experimental opportunities to study such systems. These experimental advances are complemented by new theoretical approaches and predictions, which will both guide these experimental efforts and be informed and improved by them. This review will outline the main theoretical approaches, beginning with QCD itself, summarize recent theoretical predictions and relate them both to past experiments and those from which we may expect results in the near future.

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“…More recent formulations of the NJL model [33][34][35] are focused on describing the strong interactions between particles like quarks and mesons and their behavior at finite temperature and chemical potential. Cross sections associated with quark-quark interactions were calculated and several hypotheses of the formation of hadrons starting from quark-antiquark structures were formulated.…”

Section: The Two-flavor Njl Modelmentioning

confidence: 99%

Dependence of the crossover zone on the regularization method in the two-flavor Nambu–Jona-Lasinio model

et al. 2020

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AbstractIn this article, we study the two-flavor Nambu and Jona-Lasinio (NJL) phase diagrams on the T–μ plane through three regularization methods. In one of these, we introduce an infrared three-momentum cutoff in addition to the usual ultraviolet regularization to the quark loop integrals and compare the obtained phase diagrams with those obtained from the NJL model with proper time regularization and Pauli–Villars regularization. We have found that the crossover appears as a band with a well-defined width in the T–μ plane. To determine the extension of the crossover zone, we propose a novel criterion, comparing it to another criterion that is commonly reported in the literature; we then obtain the phase diagrams for each criterion. We study the behavior of the phase diagrams under all these schemes, focusing on the influence of the regularization procedure on the crossover zone and the presence or absence of critical end points.

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Quark–meson coupling model based upon the Nambu–Jona Lasinio model

Cited by 7 publications

References 41 publications

Electroweak properties of pions in a nuclear medium

Electroweak properties of pions in a nuclear medium

Nuclear-bound quarkonia and heavy-flavor hadrons

Dependence of the crossover zone on the regularization method in the two-flavor Nambu–Jona-Lasinio model

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