Comparing electroweak data with a decoupling model

Present data, both from direct Higgs search and from analysis of electroweak data, are starting to become rather restrictive on the possible values for the mass of the standard model Higgs. We discuss a new physics scenario based on a model with decoupling (both in a linear and in a non linear version) showing how it allows for an excellent fit to the present values of the $\epsilon$ parameters and how it widens the allowed ranges for the Higgs mass (thought as elementary in the linear version, or as composite in the non linear one).Comment: 10 pages, 3 Figures Late

The s-sbar and K-Kbar nature of f_0(980) in D_s decays

We examine the D_s -> f_0(980) pi amplitude through a constituent quark-meson model, incorporating heavy quark and chiral symmetries, finding a good agreement with the recent E791 data analysis of D_s -> 3pi via f_0(980). The f_0(980) resonance is considered at the moment of production as an s sbar state, later evolving to a superposition of mainly s sbar and K Kbar. The analysis is also extended to the more frequent process D_s -> phi pi.Comment: 8 pages, 5 figure

Bounds on New Physics from the New Data on Parity Violation in Atomic Cesium

We assume the latest experimental determination of the weak charge of atomic cesium and analyze its implications for possible new physics. We notice that the data would imply positive upper and lower bounds on the new physics contribution to the weak charge, $\delta_NQ_W$. The required new physics should be of a type not severely constrained by the high energy precision data. A simplest possibility would be new neutral vector bosons almost un-mixed to the $Z$ and with sizeable couplings to fermions. The lower positive bound would however forbid zero or negative $\delta_NQ_W$ and exclude not only the standard model but also models with sequential $Z^\prime$, in particular simple-minded towers of $Z$-like excitations from extra-dimensions. The bound would also imply an upper limit on the $Z^\prime$ mass within the models allowed. Conclusions are also derived for models of four-fermion contact interactions.Comment: 11 pages, Latex, 1 PS figure, final version for Physics Letter

El arte de los champús en dermatología canina y felina : estrategias de tratamiento y prevención

Este artículo revisa la tecnología actual relacionada con los champúes veterinarios utilizados para perros y gatos. Se exponen los criterios utilizados para evaluar su eficacia. Se revisan las indicaciones de uso de los champús en desórdenes queratoseborreicos, enfermedades parasitarias, enfermedades desórdenes queratoseborreicos, enfermedades alérgicas. En los desórdenes querato seborreicos, enfermedades paasitarias, enfermedades bacterianas, enfermedades fúngicas y enfermedades alérgicas. En los desórdenes queratoseborreicos, enfermedades parastarias, enfermedades alérgicas. En los desórdenes queratoseborreicos se utilizan agentes queratomodulares y antiseborreicos. En dermatología veterinaria no se usan frecuentemente antiparasitos y se discuten sus indicaciones y limitaciones.