[en] Abstract only

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[en] We study new strong resonances associated with the physics responsible for the strong electroweak symmetry breaking. We write down the lowest order effective chiral Lagrangians describing the couplings of these new resonances to the Standard Model fields. We als find low-energy constraints on the p resonance couplings to the top quark. (author)

[en] We continue our previous work on the flavor-conserving leptonic decays of the Z boson with neutral heavy leptons (NHL close-quote s) in the loops by considering box, vertex, and self-energy diagrams for the muon decay. By inclusion of these loops (they contribute to the input parameter M_W), we can probe the full parameter space spanned by the so-called flavor-conserving mixing parameters ee_mix,μμ_mix,ττ_mix. We show that only two diagrams from each class (box, vertex, and self-energy) are important; further, after renormalization only two box diagrams open-quotes survive close-quote close-quote as dominant. We compare the results of our analysis with the existing work in this field and conclude that flavor-conserving decays have certain advantages over traditionally considered flavor-violating ones. copyright 1997 The American Physical Society

[en] Small neutrino masses can arise in some grand unified models or superstring theories. We consider a model with an enhanced fermion sector containing Dirac neutral heavy leptons. The dependence on the mass and mixing parameters of these new fermions is investigated for several measurable quantities. We study the flavor-conserving leptonic decays of the Z boson and universality breaking in these decays. We also consider the W boson mass dependence on neutral heavy lepton parameters

[en] Full text: Our purpose was to evaluate the gallbladder (GB) emptying in pts with chronic pancreatitis and to determine whether or not the use of pancreatic extract has an impact in improving that function. The GB emptying was evaluated in 11 patients (pts) with mild to moderate chronic pancreatitis, and in 10 normal volunteers. Pts and controls who presented any kind of condition that could interfere with the gastric or gallbladder emptying were excluded. The GB ejection fraction was calculated at 30, 45, and 60 minutes after a standardized fatty meal ingestion. In the pts group, this evaluation was obtained in two different periods of time, without and with the addition of pancreatic extract. The gastric emptying was previously determined in all patients and controls with Technetium-99m-sulfur colloid mixed in the same fatty meal used for the hepatobiliary scans. The results disclosed that the GB ejection fraction at 60 minutes was significantly lower in patients compared to controls (<0,05). On the other hand, the GB emptying did not statistically improve after the administration of pancreatic extract (p>0,05). The gastric emptying was similar between the two groups (p>0,05). In conclusion, mild to moderate chronic pancreatitis is associated with GB function impairment. Our results suggest that the delay in GB emptying does not depend exclusively on the alteration in the intestinal phase of the GB stimulation, but may be a result of multiple other factors

[en] During the transition from deconfined to hadronic stage the firaball in ultrarelativistic nuclear collisions can fragment. We propose a method which uses the Kolmogorov-Smirnov test to identify whether the fireball has fragmented or not. We test the method on artificial data generated by a Monte Carlo event generator which simulates particle emission from a fragmented fireball. (author)

[en] Facing the plethora of alternative hypotheses for the mechanism of electroweak symmetry breaking (ESB) it is highly desirable to typify its phenomenology using the effective Lagrangians. The BESS (Breaking Electroweak Symmetry Strongly) model effectively describes a Higgsless ESB mechanism accompanied by a hypothetical strong triplet of vector resonances. The model couples the vector resonances universally to all SM fermion generations. We have modified the model by allowing direct interactions of the vector triplet with the third quark generation only. This is motivated by the extraordinary mass of the top quark which is close to the ESB scale. In addition, we have introduced new Lagrangian terms admitted by the model's symmetries. Our modifications of the BESS model can significantly relax the low-energy limits on the original BESS model's parameters. Here, beside formulating our model, we present its basic phenomenology and compare it to the original BESS model. Our preliminary calculations suggest the possibility to use some of the LHC processes to detect the new vector resonances. However, to make a final assessment a more involved and realistic analysis is needed. (author)

[en] This work presents a brief description of the situation of Brazilian Regulatory Authority with regard to safety control of industrial radioactive installations. It shows the national regulatory infrastructure responsible for radiation safety inspections, the regulation infrastructure, the national inventory of industrial installations, the national system of inspection and enforcement and the national system for qualifying radiation protection officers. Some results of regulatory safety inspections are also shown. (author)

[en] We study the possible production, at future e⁺e_- colliders and at LHC, of a new vector resonance p associated with new strong physics that could be responsible for electroweak symmetry breaking. For the effective description of the vector resonance we introduce a modified Breaking Electroweak Symmetry Strongly model. Since the new resonance exhibits enhanced couplings to the W and Z bosons as well as to the top quark we concentrate on the processes e⁺e_- → tt-bar and e⁺e_- → ν_e ν-bar_e tt-bar. At LHC we study the p production in the process pp → ptt-bar with p decaying to a W⁺W_- pair. We calculate the cross sections of these processes and of the relevant backgrounds (Authors)