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Study of meson and nucleon properties in vacuum and in nuclear medium based on the light front approach


The main interests of our projects are to explore the quark structure of these strongly interacting hadrons, in free space and in medium, in terms of the electromagnetic- and weak-interactions(electroweak interactions), and strong interaction of QCD, namely by the full use of the dynamics established in Standard Model. In particular, it is believed that the matters (hadrons) in our universe get their physical masses in free space due to the spontaneous breaking of chiral symmetry, and/or by the dynamical symmetry breaking in the context of QCD. Furthermore, this spontaneously broken symmetries, are believed to be partially restored in medium with high hadron density and temperature (partial restoration of chiral symmetry). As a consequence, the masses and the properties of hadrons are expected to be modified in medium --- supported by several experimental facts, such as EMC effect~\cite{EMC}, bound proton electromagnetic form factors~\cite{Strauch}, possible formation of quark-gluon plasma phase~\cite{QGP},and the fact of stable neutron existence in nuclei. Thus, to study the quark structure of hadrons in free space and in medium, play important roles to understand the existence of matters in our universe, as the forms we can usually observe by experiments. (AU)

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(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
RAMALHO, G.; TSUSHIMA, K. Axial form factors of the octet baryons in a covariant quark model. Physical Review D, v. 94, n. 1 JUL 1 2016. Web of Science Citations: 9.

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