80 research outputs found
Electromagnetic Form Factors of the SU(3) Octet Baryons in the semibosonized SU(3) Nambu-Jona-Lasinio Model
The electromagnetic form factors of the SU(3) octet baryons are investigated
in the semibosonized SU(3) Nambu--Jona-Lasinio model (chiral quark-soliton
model). The rotational and strange quark mass corrections in linear
order are taken into account. The electromagnetic charge radii of the nucleon
and magnetic moments are also evaluated. It turns out that the model is in a
remarkable good agreement with the experimental data.Comment: RevTex is used. 37 pages. The final version to appear in Phys. Rev.
D. 13 figures are include
Magnetic Moments of the SU(3) Octet Baryons in the semibosonized SU(3) Nambu-Jona-Lasinio Model
We investigate the magnetic moments of the SU(3) octet baryons in the
framework of the semibosonized Nambu--Jona--Lasinio model. The
rotational corrections and strange quark mass in linear order are taken
into account. We derive general relations between magnetic moments of the SU(3)
octet baryons, based on the symmetry of our model. These relations indicate
that higher order corrections such as and are
relatively small. The magnetic moments of the octet baryons predicted by our
model are quantitatively in a good agreement with experimental results within
about 15.Comment: 17 pages, RevTex, 1 postscript figur
Rotational Corrections to Axial Currents in Semibosonized SU(3) Nambu--Jona-Lasinio Model
We examine O(1/\Ne) rotational corrections to axial couplings \gt~ and \go~
in the framework of the semibosonized SU(3) Nambu--Jona-Lasinio model. A
novelty is due to the observation that the rotational (cranking) velocity and
the rotation matrix itself do not commute within semiclassical quantization
scheme. If time ordering in the quark loop is maintained new contributions,
which have no analogue in the Skyrme model, appear. They substantially improve
numerical results for the axial couplings which without the present corrections
are badly underestimated.Comment: RUP-TPII-54/93, in LaTeX, 6pages, no figures, in revised version two
references have been update
Strangeness in the Scalar Form Factor of the Nucleon
The scalar form factor of the nucleon and related physical quantities are
investigated in the framework of the semibosonized SU(3) Nambu-Jona-Lasinio
soliton model. We take into account the rotational corrections and
linear corrections. The strangeness content of the nucleon in the scalar
form factor is discussed in detail. In particular, it is found that the
corrections play an essential role of reducing the arising from the leading order and rotational contributions.
We obtain the \sigma_{\pi N} (0)=40.80\;\mbox{MeV}, \Delta \sigma =
\sigma_{\pi N} (2m^{2}_{\pi})-\sigma_{\pi N} (0) = 18.18\;\mbox{MeV} and
\langle r^2\rangle^{S}_{N} = 1.50\;\mbox{fm}^2.
The results are in a remarkable agreement with empirical data analyzed by
Gasser, Leutwyler, and Sainio~\cite{gls}.Comment: 13 pages, RevTex is used. 3 figures as uufiles are include
Rotational Corrections to in the NJL Model and Charge Conjugation
We show that the rotational corrections to , derived using the
semiclassical quantization scheme in the NJL model, possess correct properties
under charge conjugation.Comment: 4 pages, revtex, no figures, final version published in
Phys.Rev.C52(1995)42
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The instanton liquid model of QCD
Within a microscopic model for the non-perturbative vacuum of QCD, hadronic correlation functions are calculated. In the model the vacuum is a statistical, interacting ensemble of instantons and anti-instantons at the scale of {Lambda}{sub QCD}. Hadronic two-point as well as three-point correlation functions are evaluated and compared with phenomenological information about the spectra, couplings and form factors. Especially the electro magnetic form factor of the pion is obtained and new predictions for the charm contribution to DIS structure functions are made
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