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Study of the electromagnetic and axial structure of the baryons in the vacuum and in nuclear medium

Abstract

The structure of the nucleon and other baryons can be studied using electro-weak probes. In the last years a significant amount of data were collected in the modern accelerators. To interpret those data it is fundamental the development of theoretical models. Of interest are models based on the quarks and mesons degrees of freedom. In the past, the Covariant Spectator Quark Model (CSQM) was developed for the study of the internal structure of the nucleon and other light baryons based on constituent quarks (quarks with internal structure).The main goal of the project is to keep developing models for other baryons and for different physical conditions. More specifically, we are interested in the following cases: i) baryon in vacuum; ii) inclusion of quark-antiquark effects; iii) model extensions for the timelike region,in order to study resonance N* decays intonucleon (N) and electron-positron pairs (N* -> N e+e-); iv) extension of the model for nuclear medium; v) extension of the model for baryons with heavy quarks (s,c,b). (AU)

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Scientific publications (11)
(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. Covariant model for Dalitz decays of decuplet baryons to octet baryons. Physical Review D, v. 102, n. 5 SEP 15 2020. Web of Science Citations: 0.
RAMALHO, G.; PENA, M. T. Covariant model for the Dalitz decay of the N(1535) resonance. Physical Review D, v. 101, n. 11 JUN 11 2020. Web of Science Citations: 0.
RAMALHO, G.; PENA, M. T.; TSUSHIMA, K. Hyperon electromagnetic timelike elastic form factors at large q(2). Physical Review D, v. 101, n. 1 JAN 21 2020. Web of Science Citations: 0.
RAMALHO, G. Low-Q(2) empirical parametrizations of the N{*} helicity amplitudes. Physical Review D, v. 100, n. 11 DEC 10 2019. Web of Science Citations: 0.
RAMALHO, G.; DE MELO, J. P. B. C.; TSUSHIMA, K. Octet baryon electromagnetic form factor double ratios (G(E){*}/G(M){*})/(G(E)/G(M)) in a nuclear medium. Physical Review D, v. 100, n. 1 JUL 30 2019. Web of Science Citations: 1.
RAMALHO, G. Combined parametrization of G(En) and gamma{*}N ->Delta(1232) quadrupole form factors. EUROPEAN PHYSICAL JOURNAL A, v. 55, n. 3 MAR 5 2019. Web of Science Citations: 1.
EICHMANN, GERNOT; RAMALHO, G. Nucleon resonances in Compton scattering. Physical Review D, v. 98, n. 9 NOV 28 2018. Web of Science Citations: 8.
WANG, BO-TING; HOBBS, T. J.; DOYLE, SEAN; GAO, JUN; HOU, TIE-JIUN; NADOLSKY, PAVEL M.; OLNESS, FREDRICK I. Mapping the sensitivity of hadronic experiments to nucleon structure. Physical Review D, v. 98, n. 9 NOV 28 2018. Web of Science Citations: 3.
RAMALHO, G. N{*} form Factors Based on a Covariant Quark Model. FEW-BODY SYSTEMS, v. 59, n. 5 SEP 2018. Web of Science Citations: 5.
RAMALHO, G. New low-Q(2) measurements of the gamma{*}N -> Delta(1232) Coulomb quadrupole form factor, pion cloud parametrizations and Siegert's theorem. EUROPEAN PHYSICAL JOURNAL A, v. 54, n. 5 MAY 14 2018. Web of Science Citations: 5.
RAMALHO, G. Holographic estimate of the meson cloud contribution to nucleon axial form factor. Physical Review D, v. 97, n. 7 APR 11 2018. Web of Science Citations: 1.

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