729 research outputs found
Radiative decays of mesons in the NJL model
We revisit the theoretical predictions for anomalous radiative decays of
pseudoscalar and vector mesons. Our analysis is performed in the framework of
the Nambu-Jona-Lasinio model, introducing adequate parameters to account for
the breakdown of chiral symmetry. The results are comparable with those
obtained in previous approaches.Comment: 19 pages incl. 4 figure
Electric polarizability of nuclei from a longitudinal sum rule
The nuclear electric polarizability is theoretically analyzed using a sum
rule derived from the longitudinal part of the forward Compton amplitude.
Beyond the leading dipole contribution, this approach leads to the presence of
potential-dependent terms that do not show up in previous analyses. The
significance of these new contributions is illustrated by performing an
explicit calculation for a proton-neutron system interacting via a separable
potential.Comment: 9 pages, revtex. Minor changes, two references added. To appear in
Nucl. Phys.
Form factors of radiative pion decays in nonlocal chiral quark models
We study the radiative pion decay pi+ -> e+ nu_e gamma within nonlocal chiral
quark models that include wave function renormalization. In this framework we
analyze the momentum dependence of the vector form factor F_V(q^2), and the
slope of the axial-vector form factor F_A(q^2) at threshold. Our results are
compared with available experimental information and with the predictions given
by the NJL model. In addition we calculate the low energy constants l_5 and
l_6, comparing our results with the values obtained in chiral perturbation
theory.Comment: 22 pages, 1 figure. arXiv admin note: substantial text overlap with
arXiv:1011.640
Characteristics of the chiral phase transition in nonlocal quark models
The characteristics of the chiral phase transition are analyzed within the
framework of chiral quark models with nonlocal interactions in the mean field
approximation. In the chiral limit, we develop a semi-analytic framework which
allows us to explicitly determine the phase transition curve, the position of
the critical points, some relevant critical exponents, etc. For the case of
finite current quark masses, we show the behavior of various thermodynamical
and chiral response functions across the phase transition.Comment: 19 pages, 5 figures. Figures 1 and 2 modified, references added,
minor changes in the presentation and in the discussion of results. Accepted
for publication in Phys. Rev.
Phase diagram of neutron star quark matter in nonlocal chiral models
We analyze the phase diagram of two-flavor quark matter under neutron star
constraints for a nonlocal covariant quark model within the mean field
approximation. Applications to cold compact stars are discussed.Comment: 3 pages, 1 figure, proceedings of the IV International Conference on
Quarks and Nuclear Physics (QNP06), Madrid, Spain, June 5-10, 2006. To appear
in Eur. Phys. J.
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