1995 XVI Brazilian National Meeting on Particles and Fields XVI Encontro Nacional de Fisica de Particulas e Campos (XVI Brazilian National Meeting on Particles and Fields) October 24-28,1995 Caxambu, Brazil Editors G. A. Alves, CBPF M. E. de Araiijo, UnB N. R. F. Braga, UFRJ F. T. Brandt, IFUSP C. O. Escobar, IFUSP E. Ferreira, UFRJ El O. Girotti, UFRGS M. Gleiser, Dartmouth M. Novello, CBPF V. Rivelles, IFUSP A. Santoro, CBPF J. W. F. Valle, IFIC Sociedade Brasileira de Fisica The Brazilian National Meeting on Particles and Fields High Energy Physics is one of the most traditional areas of research in Physics in Brazil. It started in the 30's with the important contribution of G. Wataghin and the next generations, which included J. Tiomno, J. Leite Lopes, C. M. G. Lattes, J. A. Swieca, J. J. Giambiagi and G. Bollini. The Brazilian National Meeting on Particles and Fields (Encontro Nacional de Fisica de Particulas e Campos) is a scientific meeting held every year that assembles the Brazilian Physics community working in Field Theory, Cosmology and Gravitation, Particle Physics Phenomenology, and Experimental High Energy Physics. The most important aim of this meeting is to enable the interchange of information among the whole community through invited review talks of wide interest. An overview of the research in the area is achieved through the presentation of short communications of the submitted papers and the panel session. The first of these meetings was held in 1978 and had about 80 participants. In the following years this number has grown considerably and in 1995 we have more than 300 participants, including Master and Ph.D. graduated students, and 215 submitted papers. The meeting is organized under the auspices of Sociedade Brasileira de Fisica (OF) with the support of Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES), Centro Latino—Americana de Fisica (CLAF), Conselho Nacional de Desenvolvimento Cienti- fico e TecnolOgico (CNPq), Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP), do Rio de Janeiro (FAPERJ), do Rio Grande do Sul (FAPERGS), and Finan- ciadora de Estudos e Projetos (FINED). We would like to thank the SBF staff for all their efforts, in particular to Neusa M. L. Martin for organizing these Proceedings. June 1996 The Organizing Committee INDICE PALESTRAS DE REVISAO E SEMINARIOS The Top Quark and More: Some Highlights of Physics from the DO Experiment H. E. Montgomery The Origin of Matter in the Universe: A Brief Review M. Gleiser 16 The Auger Project: Highest Energy Cosmic Rays A. Etchegoyen 22 Screening in High-t QCD R. Jackiw 30 The Higgs Boson : Why, Where, How and When R. Rosenfeld 52 BRS Cohomology of Zero Curvature Systems M. Carualho, L.C.Q. Vilar, C.A.G. Sasaki, S.P. Sorella 58 Extending the Use of the Zeta Function D. G. C. McKeon 69 Numerical Simulations and Lattice Field Theories M. G. do Amaral 77 Noncommutative Geometry and the Standard Model: An overview J. M. Gracia-BondIa 88 0 Paradoxo de Perda de Informacoes no interior de um Buraco Negro M. Schiffer 93 Field theoretic approach for systems of composite hadrons G. Krein 94 Intrinsic and Leading Charm in Hadronic Collisions F. S. Navarra, F. O. Durdes, M. Nielsen 104 B-Physics at. Fermilab DO Experiment Present and Prospects G. A. Alves 121 CONTRIBUKOES CIENTfFICAS A. COSMOLOGIA E GRAVITAci0 Geometrical sketch for an extended Einstein-Cartan theory M. F. Borges 131 Bianchi Identities for an extended five dimensional Cartan gravity theory M. F. Borges, J. Longhi 134 Density perturbations in Kaluza—Klein theory during a de Sitter phase J. C. Fabris, M. Sakellariadou 137 Universo Primordial corn Fasc de Contracao F. G. Alvarenga, J. C. Fabris 141 PPN Constraints in a Naked Singularity Spherical Static Solution J. P. Baptista, A. B. Batista, J. C. Fabris, A. P. Tourrenc 146 On the spectrum of 7-fluids J. A. E. Carrillo, J. A. S. Lima, A. Math Jr 150 Canonical Formulation of Standard Cosmology: Direct Quantum Approach M. Novello, J.M. Salim, M.C. Motta da Silva, R. Klippert 153 Radiation Waves in Compact Universes: the S 3 and T3 cases A. Bernui Leo 158 Energia Potential de Schrodinger e a Eletrodinamica de Weber J. J. Caluzi, A. K. T. Assis 164 Modelo cosmologico multidimensional corn viscosidade A. B. Batista, J. C. Fabris, E. V. Tonini 168 A new determination of the galactic rotation curve R. Ortiz, L.H. Amaral, J.R.D. Lepine, W.J. Maxie' 173 Determinacio dos parametros de uma onda gravitational corn uma antena ressonante esferica O. D. Aguiar, N. S. Magaihdes, W. W. Johnson, C. Frajuca 176 Model Interacting Boson-Fermion Stars C. M. G. de Sousa, J. L. Tomazelli, V. Silveira 179 Relatividade geral sem singularidades. Existe buraco negro? M. M. de Souza, R. N. Silveira 181 Exact Solutions Related to Nonminimal Gravitational Coupling C. M. G. de Sousa, F. E. Mendonfa da Silveira 182 A Computer Algebra Package for Torsion Theories of Gravitation J.E. Aman, J.B. Fonseca-Neto, M.A.H. MacCallum, M.J. Rebougas 186 Algebraic Classification of the Ricci Tensor in 5-Dimensional Spacetimes G.S. Hall, M. J. Reboufas, J. Santos, A.F.F. Teixeira 189 Topological Constraints on Maxwell Fields in General Relativity W. Oliveira, M.J. Reboufas, A.F.F. Teixeira 193 The Levi-Civita spacetime M. F. A. da Silva, L. Herrera, F. M. Paiva, N. O. Santos 196 The Finite Temperature Effective Potential of Gauge Theories in the Presence of Magnetic Fields R. O. Ramos 200 Non-Heisenberg states of the harmonic oscillator K. Dechoum, H.M. Franca 202 Fighting Astrophysics Subrahmanyan Chandrasekhar A Life for the Stars H. J. Mosquera Cuesta 204 B. FISICA EXPERIMENTAL DE ALTAS ENERGIAS Producgo de Particulas mais pesadas que pions ern Interacoes Hadronicas S.L.C. Barroso, A.O. de Carvalho, M. D.D.O. Marques, R. de Oliveira, E.H. Shibuya, C.R.A. Augusto, C.E. Navia, F.A. Pinto 211 Can we measure Charm Hadron Semileptonic Decays in E781? C. O. Escobar, E. Fernandes, F. Garcia, P. Gordon, N. Kuropatkin, T.L. Lungov, R.A. de Paula, R. Z. Funchal 215 Branching ratio for the r pv, decay in DELPHI J.R.P. Mahon, M.E. Poi, M. Srivastava 219 Abertura e taxa de contagem dos detectores de unions do experiment° EASCAMP E.G.S. Luna, A.C. Fauth, H. Nogima 223 Redes neuronais na anglise de dados de calorimetros J.M. Seixas, L.P. Caloba, M.A.P. Vasconcelos, Wan 1-Far 226 A influencia do use de cintiladores pla.sticos na caracterizactio de chuveiros atmosfericos extensos A.R.P. Bird, J.A. ChineHalo, A.C. Fauth, E. Kemp, M.A. Leigui de Oliveira, H. Nogima, M.C. Souza Jr., A. Turtelli Jr. 231 Status atual do experimento EASCAMP A.R. Bird, J.A. Botasso, J.A. Chinellato, A.C. Fauth, E. Kemp, H. Nogima, M.A. Leigui de Oliveira, L.G. dos Santos, E.L.F. Silva, M.C. Souza Jr., A. Turtelli Jr 234 Detector de cintilacio para medidas da componente eletromagnetica de chuveiros at- mosfericos extensos A.C. Fauth, E.J.T. Manganote, A. Turtelli Jr 237 Search for Flavor-Changing Neutral-Currents Decays in the E791 Experiment C. Gael 242 Study of the Production of a Single New Charged Heavy Lepton in DELPHI/LEP M. A. B. do Vale, F. M. L. Almeida and L. de Paula 245 Observation of attenuation behaviour of hadrons in extremly high energy cosmic ray inter- actions: New hadronic state? T. Arisawa, Y. Fujimoto, S. Hasegawa, K. Honda, H. Ito, V. V. Kopenkin, H. Semba, M. Tamada, Kinki K. Yokoi, G. F. Fedorova, 1. P. Ivanenko, A. K. Managadze, I.A. Mikhailova, E. G. Popova, I. V. Rakobolskaya, T. M. Rogan ova, L. G. Sveshnikova, 0. P. Strogova 248 Invariant classification of the axially symmetric solutions W. Seixas 251 Reconhecimento de eventos simulados na energia do LEP 11 utilizando redes neuronais N. Couto, Z.D. Thome, F.M.L. Almeida 254 C. FENOMENOLOGIA DE PARTfCULAS ELEMENTARES On color transparency A. Gabriela Grunfeld 258 Correlation Functions of the Gluon Field and the Observables in Soft High-Energy Scattering Fldvio I. Pereira, Erasmo Ferreira 261 Low-Energy Phenomenology in a Class of Calabi-Yau Models Luis Antonio da Motu' 265 A phenomenological model for hadron diffractive dissociation at high energies R. J. M. Covolan and J. Monianha 268 Universality tests for total cross sections J. Bellandi, A. A. Perez, J. Dias de Deus, A. B. de Pddua 272 Inelastic Overlap Functions in Geometrical Models of Elastic Hadron Scattering P.C. Reggio and M.J. Menon 280 Production of Sleptons in the Supersymrnetric Standard Model J. E. Cieza Montalvo 283 Effects of Solar Magnetosonic Waves in Future Solar Neutrino Observations J.H. Colonia, M.M. Guzzo, N. Reggiani 288 The Effect of the Terrestrial Bow Shock in Solar Neutrino Evolution Marcelo M. Guzzo, Pedro C. de Holanda 292 The Solar Neutrino Propagation and the Slow Solar Magnetosonic Waves M. M. Guzzo, N. Reggiani, P.H. Sakanaka 295 SolucOes ng.o adiabiticas para a oscilacio entre neutrinos J. Bellandi, J. R. Fleitas 298 Experimental Extraction of the Proton Profile at the Highest Energies P. A. S. Carvalho, M. J. Menon 301 Phenomenological approach to elastic proton-proton scattering above 10 GeV A.F. Martini, M.J. Menon 305 Preliminary Results on it - p Scattering in a Multiple Diffraction Approach M.J. Menon, J.T.S. Paes 308 D. TEORIA DE CAMPOS Dynamical generation of supersymmetry Ashok Das, Marcelo Hoti 311 Cheshire Cat Scenario in a 3 + 1 dimensional Hybrid Chiral Bag M.