We study the magnetic moments of the octet, low-lying charm, and low-lying
bottom baryons with nonzero light quarks in symmetric nuclear matter. This is
the first study of estimating the medium modifications of magnetic moments for
these low-lying charm and bottom baryons.Comment: 13 pages, 8 figures (eps files

Tsushima, Kazuo

English

arXiv

We study the magnetic moments of the octet, decuplet, low-lying charm, and
low-lying bottom baryons with nonzero light quarks in symmetric nuclear matter
using the quark-meson coupling (QMC) model, which satisfies the constraint for
the allowed maximum change (swelling) of the in-medium nucleon size derived
from the $y$-scaling data for $^3$He$(e,e')$ and $^{56}$Fe$(e,e')$. The present
QMC model also satisfies the expected allowed maximum enhancement of the
nucleon magnetic moments in nuclear matter. Moreover, it has been proven that
the calculated in-medium to free proton electromagnetic form factor (EMFF)
ratios calculated within the QMC model, reproduce well the proton EMFF super
ratio extracted from $^4{\rm He}(\vec{e},e'\vec{p})^3{\rm H}$ at Jefferson
Laboratory (JLab). The medium modifications of the magnetic moments are
estimated by evaluating the in-medium to free space baryon magnetic moment
ratios to compensate the MIT bag deficiency to describe the free space octet
baryon magnetic moments, where ratios are often measured directly in
experiments even without knowing the absolute values, such as the free and
bound proton electromagnetic form factors, as well as the European Muon
Collaboration (EMC) effect to extract the structure function $F_2$ ratio of the
bound to free nucleons by the corresponding cross section ratio. We also
present the results calculated with the different current quark mass values for
the strange and bottom quarks to see the possible impact. Furthermore, for a
practical use, we give the explicit density dependent parametrizations for the
vector potentials of the baryons and light-$(u, d)$ quarks, as well as for the
effective masses of the baryons treated in this study, and of the mesons,
$\omega,\rho,K,K^*,\eta,\eta',D,D^*,B$, and $B^*$.Comment: 36 pages, 8 figures (34 eps figure files), extended version accepted
  for PTE

Magnetic moments of the octet, low-lying charm, and low-lying bottom baryons in a nuclear medium

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