scholarly journals Axial form factors of the octet baryons in a covariant quark model

2016 ◽  
Vol 94 (1) ◽  
Author(s):  
G. Ramalho ◽  
K. Tsushima
Keyword(s):  
Quark Model ◽  
Form Factors ◽  
Axial Form ◽  
Covariant Quark Model ◽  
Octet Baryons

THE CHIRAL QUARK MODEL AND BARYON PHENOMENOLOGY

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1785-1790 ◽  
Author(s):  
D. O. RISKA
Keyword(s):  
Quark Model ◽  
Form Factors ◽  
Axial Current ◽  
Chiral Quark Model ◽  
Pion Decay ◽  
Decay Widths ◽  
Nucleon Form Factors ◽  
Baryon Spectra ◽  
Baryon Resonances ◽  
Covariant Quark Model

The chiral quark model posits that pions couple to the axial current of constituent quarks. This chiral pion coupling governs the pion decays of baryon resonances and also implies pion and multipion interactions between the quarks. The qualitative features of this model for the description of pionic decay widths and baryon spectra are outlined. When the covariant quark model wave function for the nucleon is chosen so as to describe the empirical nucleon form factors the pion decay widths of the positive parity resonances are underpredicted. This indicates the presence of significant multiquark components in these resonances.

A QUARK-MODEL FIT FOR THE ELECTROMAGNETIC PROPERTIES OF OCTET BARYONS

1992 ◽  
Vol 07 (12) ◽  
pp. 2841-2861 ◽  
Author(s):  
S. N. JENA ◽  
S. PANDA
Keyword(s):  
Quark Model ◽  
Magnetic Moments ◽  
Center Of Mass ◽  
Axial Vector ◽  
Form Factors ◽  
Electromagnetic Properties ◽  
Coupling Constant ◽  
Vector Coupling ◽  
Pion Nucleon ◽  
Octet Baryons

A simple independent-quark model based on the Dirac equation with an equally mixed scalar–vector linear confining potential model is used to obtain a fit for the electromagnetic properties — like the magnetic moments, charge radii and axial-vector coupling-constant ratios — of octet baryons, taking into account the appropriate center-of-mass corrections. This fit is extended to include the quark-core contributions to the nucleon electromagnetic form factors [Formula: see text], [Formula: see text], [Formula: see text] and the axial-vector form factor GA(q2). The respective root-mean-square radii associated with [Formula: see text] and GA(q2) come out as [Formula: see text] and [Formula: see text]. The possibility of restoring in this model the chiral symmetry in the usual way is discussed and the pion-nucleon coupling constant is found as gπ NN = 13.72 as compared to (gπ NN ) exp ≃ 13.

scholarly journals B → K(∗)μ+μ− in covariant quark model

2015 ◽  
Vol 39 ◽  
pp. 1560113
Author(s):  
A. Liptaj ◽  
S. Dubnička ◽  
A. Z. Dubničková ◽  
M. A. Ivanov
Keyword(s):  
Beyond Standard Model ◽  
Standard Model ◽  
Quark Model ◽  
Rare Decays ◽  
Form Factors ◽  
New Physics ◽  
Angular Distributions ◽  
Heavy Mesons ◽  
Theoretical Predictions ◽  
Covariant Quark Model

The covariant quark model with infrared confinement (CQM) is a well-suited theoretical framework to describe large variety of hadronic processes, including rare decays of heavy mesons. In this text we focus on the reactions [Formula: see text], which have been recently measured by Refs. 1–4. The measurements include also information about the angular distributions and their significance is given by possible New Physics (NP) effects which are predicted in numerous beyond Standard Model (SM) scenarios. Even with clever choice of experimental observables, a model dependence cannot be fully removed from the theoretical predictions. In this text we present the computation of the [Formula: see text] form factors within the CQM and give results for some of the most commonly used observables ([Formula: see text], [Formula: see text]).

scholarly journals Heavy-to-light form factors in the final hadron large energy limit: Covariant quark model approach

1999 ◽  
Vol 451 (1-2) ◽  
pp. 187-194 ◽  
Author(s):  
J. Charles ◽  
A. Le Yaouanc ◽  
L. Oliver ◽  
O. Pène ◽  
J.-C. Raynal
Keyword(s):  
Quark Model ◽  
Form Factors ◽  
Large Energy ◽  
Energy Limit ◽  
Light Form ◽  
Covariant Quark Model ◽  
Model Approach

q2-Dependence of Heavy-to-Light Transitions

1997 ◽  
Vol 12 (09) ◽  
pp. 653-660 ◽  
Author(s):  
M. A. Ivanov ◽  
Yu. M. Valit
Keyword(s):  
Quark Model ◽  
Form Factors ◽  
Physical Region ◽  
Relativistic Quark Model ◽  
Vector Form ◽  
Pole Dominance ◽  
Axial Form ◽  
Light Form

The q2-dependence of the heavy-to-light form factors in the full physical region is obtained within the relativistic quark model with heavy infrapropagators. It is shown that the behavior of the vector form factors agrees with the pole dominance hypothesis whereas the behavior of the axial form factors is rather different from the polelike function.

Impact of scalar mesons on the rare B-decays

2015 ◽  
Vol 39 ◽  
pp. 1560086
Author(s):  
Aidos Issadykov ◽  
Mikhail A. Ivanov ◽  
Sayabek K. Sakhiyev
Keyword(s):  
Angular Distribution ◽  
Quark Model ◽  
Scalar Meson ◽  
Form Factors ◽  
Kinematical Region ◽  
Transition Form ◽  
B Decays ◽  
Straightforward Calculation ◽  
Scalar Mesons ◽  
Covariant Quark Model

In the wake of exploring uncertainty in the full angular distribution of the [Formula: see text] caused by the presence of the intermediate scalar [Formula: see text] meson, we perform the straightforward calculation of the [Formula: see text] (S is a scalar meson) transition form factors in the full kinematical region within the covariant quark model. We restrict ourselves by the scalar mesons below 1 GeV: [Formula: see text]. As an application of the obtained results we calculate the widths of the semileptonic and rare decays [Formula: see text], [Formula: see text] and [Formula: see text]. We compare our results with those obtained in other approaches.

scholarly journals Form factors of theB−Stransitions in the covariant quark model

2015 ◽  
Vol 91 (7) ◽  
Author(s):  
Aidos Issadykov ◽  
Mikhail A. Ivanov ◽  
Sayabek K. Sakhiyev
Keyword(s):  
Quark Model ◽  
Form Factors ◽  
Covariant Quark Model

scholarly journals ELECTROMAGNETIC FORM FACTORS OF PSEUDOSCALAR MESONS

2017 ◽  
Vol 17 (2) ◽  
pp. 148-163
Author(s):  
V.V. Andreev ◽  
A.F. Krutov
Keyword(s):  
Quantum Mechanics ◽  
Quark Model ◽  
Form Factors ◽  
Electromagnetic Form Factors ◽  
Mean Square ◽  
Pseudoscalar Mesons ◽  
Self Consistent ◽  
Point Form ◽  
Invariant Quantum ◽  
Covariant Quark Model

Mean-square radii and electromagnetic form factors of light mesons are obtained in the framework of Poincare covariant quark model, which is basedon the point form of Poincare invariant quantum mechanics. Calculations areperformed with the use of the requirement of self-consistent description of electroweak properties and masses of pseudoscalar and vector mesons.

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