Kaon form factor in holographic QCD

Abidin, Zainul; Hutauruk, Parada T. P.

doi:10.1103/physrevd.100.054026

Cited by 10 publications

(5 citation statements)

References 40 publications

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“…The internal structure of kaons can be explored by the electromagnetic form factors (EMFFs), which reflect the underlying quark-gluon dynamics [15,16]. Many attempts have been made to understand the internal structure of kaons using various approaches, e.g., the Dyson-Schwinger equation (DSE), Nambu-Jona-Lasinio (NJL) model, chiral perturbation theory (ChPT), and instanton vacuum-based models [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Experimentally, K-meson EMFFs are poorly known, except for the K − in the low Q 2 region (Q 2 < 0.2 GeV 2 ) [30], where Q 2 = −q 2 and q is the four-momentum transfer.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

Electroweak properties of pions in a nuclear medium

Hutauruk

Tsushima

2019

Phys. Rev. C

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“…From the experimental side, the form factors have been measured with high precision for a space-and time-like photons [1][2][3][4][5][6][7][8][9][10]. From the phenomenological and theoretical side, there exist plenty of efforts to describe the form factor on the space-like regime (i.e [11][12][13][14][15][16][17][18][19][20][21][22] which are in agreement with the experimental determinations. Both the Electron-Ion Collider and the Jefferson Laboratory (current 12 GeV and potential 22 GeV upgrade) plan to chart out a large momentum range of spacelike pion and kaon form factors.…”

Section: Introductionmentioning

confidence: 69%

Electromagnetic time-like form factors

Miramontes,

Bashir

2023

Supl. Rev. Mex. Fis.

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We present the calculation of charged pion and kaon electromagnetic form factors in the time-like regime using Schwinger-Dyson equations and the Poincare covariant Bethe-Salpeter equations within an SU(2) isospin symmetric limit. To accurately represent the behavior of a time-like photon, we have incorporated non-valence contributions into the system of equations, enabling the decays ρ → ππ and φ → KK. The inclusion of these decay mechanisms is essential for capturing the expected behavior of the electromagnetic pion and kaon form factors. Our results for the form factors reasonably reproduce the experimental data for a time-like photon.

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“…However, these quantities could not be directly computed from quantum chromodynamics (QCD). To overcome this problem, we employ the QCD-inspired models-mimicking the QCD properties (spontaneously breaking of the chiral symmetry (SB𝜒S) and color QCD confinement)-such as the Bethe-Slapeter equation-Nambu-Jona-Lasinio (BSE-NJL) model [5][6][7][8][9][10][11][12][13][14][15][16], Dyson-Schwinger equation (DSE) model [17][18][19], light front holography (LFH) model [20], statistical model [21], nonlocal chiral quark (NLChQ) model [22], and basic light-front quantization-NJL (BLFQ-NJL) model [23]. Besides these models, the lattice QCD simulation [24,25]-which is built based on the first QCD principle technique-can be also used to calculate the above-mentioned quantities as well as the global QCD analysis, such as Jefferson Lab Angular Momentum (JAM) QCD analysis [26], xFitter QCD analysis [27], and NNPDF collaboration [28].…”

Section: Introductionmentioning

confidence: 99%

“…Many attempts have been already made to investigate the internal structure of the pion and kaon both theoretically and experimentally and many impressive signs of progress have been achieved so far. For example, nowadays, many theoretical calculations are available in the literature for the PDF, EFF, FF, and GPD for the pion and kaon using the DSE model [15][16][17], BSE-NJL model [3][4][5][6][7][8][9][10][11][12][13][14], and other models. Also, some upgraded and modern experimental facilities will be built and planned to run in the near future to improve the kinematic coverage, such as the Jlab12 upgrade (JLab20), electronion collider (EIC) [29,30], electron-ion collider in China (EicC) [31], CERN-Super Proton Synchrotron (COMPASS++/AMBER) [32], and JPARC.…”

Section: Introductionmentioning

confidence: 99%

Parton Distribution Functions for Pseudoscalar Mesons in the Confining Effective Chiral Quark Theory

2022

Makara J. Sci

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This review paper presents the gluon, sea, and valence quark distributions of the pseudoscalar (PS) mesons. The calculations of the parton structure of PS mesons are performed using the Bethe-Salpeter equation-Nambu-Jona-Lasinio (BSE-NJL) model, which offers a clear description of the dynamical chiral symmetry breaking (D𝜒SB) of the low-energy non-perturbative quantum chromodynamics (QCD), with the help of the Schwinger proper-time regularization scheme that simulates the color QCD confinement. Our results for the dynamical quark mass-which emerged from the spontaneous chiral symmetry breaking (S𝜒SB)-are generated via the chiral condensate in the chiral limit and beyond. Results for the valence parton distribution functions for the PS meson at the factorization scale 𝑄 = 2𝐺𝑒𝑉 are in excellent agreement with experimental data and the gluon distributions for the pion fitted well with the lattice QCD and Jefferson Lab Angular Momentum (JAM) QCD global fit analysis.

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Kaon form factor in holographic QCD

Cited by 10 publications

References 40 publications

Electroweak properties of pions in a nuclear medium

Electroweak properties of pions in a nuclear medium

Electromagnetic time-like form factors

Parton Distribution Functions for Pseudoscalar Mesons in the Confining Effective Chiral Quark Theory

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