Effective Lagrangian description of the lepton flavor violating decays Z-->li lj

A comprehensive analysis of the lepton flavor violating (LFV) decays Z-->li lj is presented within the effective Lagrangian approach. Both the decoupling and nondecoupling scenarios are explored. The experimental constraints from li --> lj lk \bar{lk} and li -->lj gamma as well as some relationships arising from the gauge invariance of the effective Lagrangian are used to put constraints on Z-->li lj. It is found that while current experimental data impose very strong constraints on Z-->mu e, the channel Z --> tau mu (e)still may be at the reach of the planned TESLA collider.Comment: References added, final version to appear in Physical Review

Contribution on the study of Isospora hemidactyli Carini, 1936 and a report of an adeleid pseudoparasite of the house gecko Hemidactylus mabouia, from the Rio de Janeiro Metropolitan Region, Brazil Contribuição para o estudo de Isospora hemidactyli Carini, 1936 e relato de um pseudoparasita adelídeo da lagartixa doméstica Hemidactylus mabouia da região Metropolitana do Rio de Janeiro, Brasil

A description of the coccidium Isospora hemidactyli from the house gecko Hemidactylus mabouia, a very common at dwellings in Rio de Janeiro Metropolitan Region, was made in this study. Histograms and linear regression were made for this species and determined the homogeneity of these oocysts despite of large range. Besides it, polysporocystid oocysts also were recovered from feces of the H. mabouia house gecko and they were similar to those described previously as the genus Adelina. This species should be parasitizing an invertebrate ingested by house gecko, and for that reason, is a pseudoparasite. Oocysts of I. hemidactyli were subspherical to ellipsoidal, 24.4 × 22.3&#956;m, with single-layered wall and one polar granule. Sporocysts were subspherical to ellipsoidal, 11.8 × 9.8&#956;m with Stieda and substieda bodies, residuum and sporozoites with refractile body. Oocysts of the pseudoparasite Adelina sp. were ellipsoidal, 36.3 × 30.9&#956;m, with bi-layered wall and without micropyle, residuum and polar granule. Eight to 15 sporocysts were presents and were subspherical to broadly ellipsoidal, 12.4 × 11.2&#956;m. Stieda and substieda bodies were absent. Sporozoites present refractile bodies at both ends.<br>Uma descrição do coccídio Isospora hemidactyli da lagartixa doméstica Hemidactylus mabouia, muito comum em residências da região metropolotana do Rio de Janeiro, foi feita neste estudo. Os histogramas e a regressão linear para esta espécie confirmaram a homogeneidade de seus oocistos apesar da grande amplitude de variação. Além disto, oocistos polisporocísticos também foram recuperados das fezes de H. mabouia e foram semelhantes aos descritos anteriormente no gênero Adelina. Esta espécie devia estar parasitando um invertebrado ingerido pela lagartixa doméstica, e por essa razão, é um pseudoparasita. Oocistos de I. hemidactyli foram sub-esféricos a elipsóides, 24,4 × 22,3&#956;m, com parede simples e um grânulo polar. Os esporocistos foram subesféricos a elipsóides, 11,8 × 9,8&#956;m com corpos de Stieda e substieda, resíduo e esporozoítas com corpo refráctil. Oocistos do pseudoparasita Adelina sp. foram elipsóides, 36,3 × 30,9&#956;m, com parede dupla e sem micrópila, resíduo e grânulo polar. Oito a 15 esporocistos estavam presentes e foram subesféricos a elipsóides, 12,4 × 11,2&#956;m. Os corpos de Stieda e substieda estavam ausentes. Os esporozoítas apresentam corpos refrácteis em ambas as extremidades