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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 (24)
(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.; 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, . (17/02684-5, 17/05660-0)
RAMALHO, G.. Electromagnetic form factors of the Omega(-) baryon in the spacelike and timelike regions. PHYSICAL REVIEW D, v. 103, n. 7, p. 22-pg., . (17/02684-5)
RAMALHO, G.. N* form Factors Based on a Covariant Quark Model. FEW-BODY SYSTEMS, v. 59, n. 5, p. 20-pg., . (17/02684-5)
RAMALHO, G.; PENA, M. T.; TSUSHIMA, K.. Hyperon electromagnetic timelike elastic form factors at large q(2). PHYSICAL REVIEW D, v. 101, n. 1, p. 14-pg., . (19/00763-0, 17/02684-5, 17/05660-0)
EICHMANN, GERNOT; RAMALHO, G.. Nucleon resonances in Compton scattering. PHYSICAL REVIEW D, v. 98, n. 9, p. 45-pg., . (17/02684-5)
RAMALHO, G.; PENA, M. T.. Covariant model for the Dalitz decay of the N(1535) resonance. PHYSICAL REVIEW D, v. 101, n. 11, p. 23-pg., . (17/02684-5)
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, p. 31-pg., . (17/02684-5)
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, p. 11-pg., . (17/05660-0, 17/02684-5)
RAMALHO, G.. Low-Q(2) empirical parametrizations of the N{*} helicity amplitudes. Physical Review D, v. 100, n. 11, . (17/02684-5)
EICHMANN, GERNOT; RAMALHO, G.. Nucleon resonances in Compton scattering. Physical Review D, v. 98, n. 9, . (17/02684-5)
RAMALHO, G.; PENA, M. T.; TSUSHIMA, K.. Hyperon electromagnetic timelike elastic form factors at large q(2). Physical Review D, v. 101, n. 1, . (19/00763-0, 17/02684-5, 17/05660-0)
RAMALHO, G.. N{*} form Factors Based on a Covariant Quark Model. FEW-BODY SYSTEMS, v. 59, n. 5, . (17/02684-5)
RAMALHO, G.. Covariant model for Dalitz decays of decuplet baryons to octet baryons. Physical Review D, v. 102, n. 5, . (17/02684-5)
RAMALHO, G.; PENA, M. T.. Covariant model for the Dalitz decay of the N(1535) resonance. Physical Review D, v. 101, n. 11, . (17/02684-5)
RAMALHO, G.. Low-Q(2) empirical parametrizations of the N* helicity amplitudes. PHYSICAL REVIEW D, v. 100, n. 11, p. 15-pg., . (17/02684-5)
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, . (17/02684-5)
RAMALHO, G.. Combined parametrization of G(En) and gamma{*}N ->Delta(1232) quadrupole form factors. EUROPEAN PHYSICAL JOURNAL A, v. 55, n. 3, . (17/02684-5)
RAMALHO, G.. Holographic estimate of the meson cloud contribution to nucleon axial form factor. Physical Review D, v. 97, n. 7, . (17/02684-5)
RAMALHO, G.; BECK, R; THIEL, A; THOMA, U; WUNDERLICH, Y. Quark model calculations of transition form factors at high photon virtualities. RICAP16, 6TH ROMA INTERNATIONAL CONFERENCE ON ASTROPARTICLE PHYSICS, v. 241, p. 9-pg., . (17/02684-5)
RAMALHO, G.. Covariant model for Dalitz decays of decuplet baryons to octet baryons. PHYSICAL REVIEW D, v. 102, n. 5, p. 20-pg., . (17/02684-5)
RAMALHO, G.. Combined parametrization of G(En) and gamma*N ->Delta(1232) quadrupole form factors. EUROPEAN PHYSICAL JOURNAL A, v. 55, n. 3, p. 14-pg., . (17/02684-5)
RAMALHO, G.. Holographic estimate of the meson cloud contribution to nucleon axial form factor. PHYSICAL REVIEW D, v. 97, n. 7, p. 13-pg., . (17/02684-5)

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