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Mostrando ítems 41-50 de 105
Termodinâmica e invariância de escala no modelo de Gross-Neveu
(2019)
Em vista dos modernos experimentos de colisões de íons pesados, o estudo e desenvolvimento de técnicas não perturbativas confiáveis para descrever as transições de fase da cromodinâmica quântica (QCD) é de grande importância. ...
Scalar form factors and nuclear interactions
(SPRINGER WIEN, 2008)
The scalar-isoscalar term in the two-pion exchange NN potential is abnormally large and does not respect the hierarchy of effects predicted by chiral perturbation theory. We argue that this anomaly is associated with ...
Estrutura de fases da matéria de quarks quente, densa e magnetizada no modelo de Nambu–Jona-Lasinio
(Universidade Federal de Santa MariaBrasilFísicaUFSMPrograma de Pós-Graduação em FísicaCentro de Ciências Naturais e Exatas, 2018-03-26)
In this thesis we make use of the NJL model to the study and description of the QCD phase
diagrams under different regimes of temperature, density and external magnetic fields. In our
first work we study the influence ...
Transport properties of bottomed mesons in a hot mesonic gas
(American Physical Society, 2013)
In this work we evaluate the B-meson drag and diffusion coefficients in a hot medium constituted of light mesons (π, K, K⎯⎯⎯, and η). We treat the B-meson and B*-meson interactions with pseudo-Goldstone bosons in chiral ...
Construção de líquidos de spin quirais por junções de cadeias de spin
(Universidade Federal do Rio Grande do NorteBrasilUFRNPROGRAMA DE PÓS-GRADUAÇÃO EM FÍSICA, 2021-03-26)
In this thesis work, it was sought to present a new theoretical construction method
of a chiral spin quantum liquid formed from Heisenberg spin chains. The spin chains,
initially assembled in trios, were coupled in the ...
Pion charge asymmetries in e +e -→π +π -γ
(2011)
We consider the forward-backward pion charge asymmetry for the e +e -→π +π -γ process. In addition to the Bremsstrahlung and double resonance contributions, we use four different models to describe the final state radiation ...
Charge asymmetries in e+e-??+?-? at the ? resonance
(2010)
We consider the forward-backward pion charge asymmetry for the e+e-??+?-e+e-??+?-? process. At tree level we consider bremsstrahlung and double resonance contributions. Although the latter contribution is formally sub-leading, ...
Charge asymmetries in e+e-→Π+Π-γ at the Φ resonance
(2010)
We consider the forward-backward pion charge asymmetry for the e+e-→Π+Π-e+e-→Π+Π-γ process. At tree level we consider bremsstrahlung and double resonance contributions. Although the latter contribution is formally sub-leading, ...
Pion charge asymmetries in e +e -?? +? -?
(2011)
We consider the forward-backward pion charge asymmetry for the e +e -?? +? -? process. In addition to the Bremsstrahlung and double resonance contributions, we use four different models to describe the final state radiation ...