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Dive into the research topics where Gabriel R. S. Zarnauskas is active.

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Featured researches published by Gabriel R. S. Zarnauskas.


Physical Review C | 2005

Pion-{delta}{sigma}-term

I. P. Cavalcante; D. De O. Santos; M. R. Robilotta; Gabriel R. S. Zarnauskas; J. sa Borges

We use a simple configuration space chiral model to evaluate nucleon and {delta}{sigma}-terms. Analytic expressions are consistent with chiral counting rules and give rise to expected nonanalytic terms in the chiral limit. We obtain the results 43 MeV {<=}{sigma}{sub N}{<=} 49 MeV and 28 MeV {<=}{sigma}{sub {delta}}{<=} 32 MeV, depending on the {pi}N{delta} and {pi}{delta}{delta} coupling constants used, which are compatible with values extracted from experiment and produced by other groups.


Brazilian Journal of Physics | 2007

Nucleon and delta sigma-terms

I. P. Cavalcante; M. R. Robilotta; J. Sá Borges; D. De O. Santos; Gabriel R. S. Zarnauskas

We discuss some phenomenological applications of an infrared finite gluon propagator characterized by a dynamically generated gluon mass. In particular we compute the effect of the dynamical gluon mass on pp and p̄p diffractive scattering. We also show how the data on γp photoproduction and hadronic γγ reactions can be derived from the pp and p̄p forward scattering amplitudes by assuming vector meson dominance and the additive quark model.


arXiv: High Energy Physics - Phenomenology | 2008

D+→K−π+π+: the low‐energy sector

D. R. Boito; P. C. Magalhães; M. R. Robilotta; Gabriel R. S. Zarnauskas

An effective SU(3)×SU(3) chiral lagrangian, which includes scalar resonances, is used to describe the process D+→K−π+π+ at low‐energies. Our main result is a set of five S‐wave amplitudes, suited to be used in analyses of production data.


International Journal of Modern Physics E-nuclear Physics | 2007

THE ω → π+π−π0 PROCESS IN 3H AND 3He PHOTODISINTEGRATION

P. C. Magalhães; Diogo Boito; M. R. Robilotta; Gabriel R. S. Zarnauskas

We study the decay ω(782) → π+π−π0, which can contribute as an intermediate process to the photodisintegration of 3H and of 4He. In the calculation of this amplitude, performed by means of chiral effective Lagrangians, we study the role of the contact term and the ρ(770) resonance contributions. Dalitz plots are built with different values for the ρ mass and width. Our best result is obtained without the contact term.


International Journal of Modern Physics E-nuclear Physics | 2007

NUCLEON σ-TERM AND THE CHIRAL LIMIT

Isabela P. Cavalcante; M. R. Robilotta; Gabriel R. S. Zarnauskas; J. Sá Borges

The scalar form factor of the nucleon in configuration space as well as its σ-term were evaluated some time ago in the framework of chiral symmetry. We investigate their dependence on the pion mass, aiming at the behavior of the σ-term at the chiral limit. Using the results for light pions, the nucleon mass as a function of the pion mass is evaluated. We also present the results for the scalar form factor for heavy pions.


arXiv: High Energy Physics - Phenomenology | 2008

Decay

Diogo Boito; P. C. Magalhães; M. R. Robilotta; Gabriel R. S. Zarnauskas


Archive | 2008

D^+ \to K^- \pi^+ \pi^+

Diogo Boito; Paulo Cesar Magalhaes; M. R. Robilotta; Gabriel R. S. Zarnauskas


International Journal of Modern Physics E-nuclear Physics | 2007

: chiral symmetry and scalar resonances

Isabela P. Cavalcante; M. R. Robilotta; Gabriel R. S. Zarnauskas; Jose De Sa Borges


Physical Review C | 2005

D{sup +}K{sup +}{sup +}: the low-energy sector

Isabela P. Cavalcante; D. De O. Santos; M. R. Robilotta; Gabriel R. S. Zarnauskas; Jose De Sa Borges


Physical Review C | 2005

Nucleon sigma-TERM and the Chiral Limit

Isabela P. Cavalcante; M. R. Robilotta; Jose De Sa Borges; Denis Roda Dos Santos; Gabriel R. S. Zarnauskas

Collaboration


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D. De O. Santos

Federal University of Mato Grosso do Sul

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I. P. Cavalcante

Federal University of Mato Grosso do Sul

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J. Sá Borges

Rio de Janeiro State University

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Jose De Sa Borges

Rio de Janeiro State University

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Diogo Boito

Autonomous University of Barcelona

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D. R. Boito

University of São Paulo

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J. sa Borges

University of São Paulo

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