Encontrados 13 documentos, a visualizar página 1 de 2
Z' production in 331 models
Dueñas,J. G.; Martínez,R.; Ochoa,F.We analyse the possibilities to detect a new Z' boson in di-electron events at LHC in the framework of the 331 model with right-handed neutrinos. For an integrated luminosity of 100fb-1 at LHC, and considering a central value Mz' = 1500 GeV, we obtain the invariant mass distribution in the process pp → Z' → e+e-, where a huge peak, corresponding to 800 signal events, is found above the SM background...
Leptonic decays of the B charged meson and B → Xsγ in the Two Higgs ...
Idárraga,J. P.; Martinez,R.; Rodríguez,J-Alexis; Poveda T.,N.We consider the Two Higgs Doublet Model (2HDM) of type III which leads to Flavour Changing Neutral Currents (FCNC) at tree level. In the framework of this model we calculate the NLO contribution for b → sγ and the branchings for the meson decays B+ → l+ν. We examine the limits on the new parameters λbb and M H±. We take into account the relationship between λtt and λbb comin...
A convergence result in the study of bone remodeling contact problems
Fernández, J. R.; Figueiredo, I. N.; Martínez, R.We consider the approximation of a bone remodeling model with the Signorini contact conditions by a contact problem with normal compliant obstacle, when the obstacle's deformability coefficient converges to zero (that is, the obstacle's stiffness tends to infinity). The variational problem is a coupled system composed of a nonlinear variational equation (in the case of normal compliance contact conditions) or a...
Family dependence in 331 models
Martínez,R.; Ochoa,F.Using experimental results at the Z-pole, and considering the ansatz of Matsuda as an specific texture for the quark mass matrices, we perform a chi2 fit at 95% CL to obtain family-dependent bounds to Z' mass and Z-Z' mixing angle in the framework of the main versions of 331 models. The allowed regions depend on the assignment of the physical quark families into different representations that cancel anomalies. ...
Antibody response to pneumococcal capsular polysaccharide vaccine in Down syndr...
Costa-Carvalho,B.T.; Martinez,R.M.A.; Dias,A.T.N.; Kubo,C.A.; Barros-Nunes,P.; Leiva,L.; Solé,D.; Carneiro-Sampaio,M.M.S.; Naspitz,C.K.; Sorensen,R.U.The majority of children with Down syndrome (DS) tend to have frequent bacterial infections including recurrent respiratory infections. Our objective was to evaluate the production of antibodies to pneumococcal polysaccharide antigens after active immunization in DS subjects. IgG antibodies to pneumococcal serotypes (1, 3, 6B, 9V, and 14) were measured before and 6 weeks after immunization with a 23-valent pneu...
Higgs boson decay in the large N limit
Morales,John; Martinez,R.; Hurtado,Rafael; Diaz,Rodolfo A.The Equivalence Theorem is commonly used to calculate perturbatively amplitudes involving gauge bosons at energy scales higher than gauge boson masses. However, when the scalar sector is strongly interacting the theory is non-perturbative. We show that the Equivalence Theorem holds in the large N limit at next-to-leading order by calculating the decay widths h -> W+W- and h <FONT FACE=Symbol>® p</FONT>+pi-. We ...
Estudo por Microscopia de Força Atômica de Filmes Automontados e Curados.
MEDEIROS, E. S. de.; MARTINEZ, R. A.; BERNARDES FILHO, R.; GREGÓRIO JUNIOR, R.; MATTOSO, L. H. C.2005
The process mu -> nue e$\bar\nu$mu in the 2HDM with flavor changing neutral cur...
Diaz,Rodolfo A.; Martínez,R.; Poveda,NicanorWe consider the process m -> nue e$\bar\nu$mu in the framework of a two Higgs doublet model with flavor changing neutral currents (FCNC). Since FCNC generates in turn flavor changing charged currents in the lepton sector, this process appears at tree level mediated by a charged Higgs boson exchange. From the experimental upper limit for this decay, we obtain the bound ; ximue/mH+ ; < 3.8 x 10-3 GeV-1, where...
The marsupial Didelphis albiventris is an improbable host of Paracoccidioides b...
Silva-Vergara,ML; Martinez,R; Malta,MEB; Ramirez,LE; Franco,FATo determine whether Didelphis albiventris is naturally infected with Paracoccidioides brasiliensis, 20 specimens of this mammal were studied by both direct cultivation of their viscera (spleen, liver and lungs) and by inoculation of Swiss mice by the intraperitoneal route with a suspension of fragments of these viscera. No fungal growth or structures similar to this fungus were detected. Probably D. albiventri...
Cross-talk between neurons and glia: highlights on soluble factors
Gomes,F.C.A.; Spohr,T.C.L.S.; Martinez,R.; Moura Neto,V.The development of the nervous system is guided by a balanced action between intrinsic factors represented by the genetic program and epigenetic factors characterized by cell-cell interactions which neural cells might perform throughout nervous system morphogenesis. Highly relevant among them are neuron-glia interactions. Several soluble factors secreted by either glial or neuronal cells have been implicated in...
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