Higgs Boson Discovery and Properties

We outline issues examined and progress made by the Light Higgs Snowmass 1996 working group regarding discovering Higgs bosons and measuring their detailed properties. We focused primarily on what could be learned at LEP2, the Tevatron (after upgrade), the LHC, a next linear \epem collider and a \mupmum collider.Comment: 47 pages, full postscript file also available via anonymous ftp at ftp://ucdhep.ucdavis.edu/gunion/summary_snowmass96.ps To appear in ``Proceedings of the 1996 DPF/DPB Summer Study on New Directions for High Energy Physics''. Minor revisions of references and wording have been made in a few place

Un foyer de botulisme équin dans l’Oise

Verge Jean, Poggioli Ch. Un foyer de botulisme équin dans l’Oise. In: Bulletin de l'Académie Vétérinaire de France tome 104 n°10, 1951. pp. 509-517

ESTRATEGIAS DE APRENDIZAJE Y ENSEÑANZA EN UNA ASIGNATURA VIRTUAL A NIVEL DE POSTGRADO EN VENEZUELA

ResumenEn este trabajo se describe la web de la asignatura “Estrategias de Aprendizaje y Enseñanza”, adscrita al Programa de Postgrado en Procesos de Aprendizaje de la Universidad Católica Andrés Bello (UCAB, Venezuela). Por otro lado se describe la percepción de los estudiantes acerca del proceso de enseñanza y aprendizaje endicha asignatura. Finalmente a partir de un análisis de la varianza (ANOVA), se discute la relación entre las características personales de los estudiantes (expectativas, edad, género y formación de pregrado), las habilidades informáticas previas, y el desempeño académico. La experiencia se desarrolla con un grupo de participantes de la Región Capital - Caracas (15) que cursaron elsemestre Octubre 2000 - Febrero 2001. Los resultados indican que los estudiantes consideran que esta experiencia les exige mucho esfuerzo y cambios en sus hábitos de estudio, pero la valoran como “muy positiva” y recomiendan la necesidad de poseer mejores niveles previos en el uso de los recursos informáticos, antes de iniciar este tipo de experiencias. En cuanto a lascaracterísticas de los participantes y el desempeño académico, se confirma la apreciación cualitativa de los estudiantes, ya que hallamos relación significativa entre los conocimientos previos en informática y el rendimiento final. Sin embargo, las variables personales (género, edad, expectativas, formación de pregrado) no muestran relación significativa con el rendimiento, pero si algunos datos de interés.Palabras ClaveEstrategias de Aprendizaje, Enseñanza, Postgrado, AsignaturaVirtua

Dimensionless Coupling of Bulk Scalars at the LHC

We identify the lowest-dimension interaction which is possible between Standard Model brane fields and bulk scalars in 6 dimensions. The lowest-dimension interaction is unique and involves a trilinear coupling between the Standard Model Higgs and the bulk scalar. Because this interaction has a dimensionless coupling, it depends only logarithmically on ultraviolet mass scales and heavy physics need not decouple from it. We compute its influence on Higgs physics at ATLAS and identify how large a coupling can be detected at the LHC. Besides providing a potentially interesting signal in Higgs searches, such couplings provide a major observational constraint on 6D large-extra-dimensional models with scalars in the bulk.Comment: 20 page

Weakly-Coupled Higgs Bosons and Precision Electroweak Physics

We examine the prospects for discovering and elucidating the weakly-coupled Higgs sector at future collider experiments. The Higgs search consists of three phases: (i) discovery of a Higgs candidate, (ii) verification of the Higgs interpretation of the signal, and (iii) precision measurements of Higgs sector properties. The discovery of one Higgs boson with Standard Model properties is not sufficient to expose the underlying structure of the electroweak symmetry breaking dynamics. It is critical to search for evidence for a non-minimal Higgs sector and/or new physics associated with electroweak symmetry breaking dynamics. An improvement in precision electroweak data at future colliders can play a useful role in confirming the theoretical interpretation of the Higgs search results

Position resolution and particle identification with the ATLAS EM calorimeter

In the years between 2000 and 2002 several pre-series and series modules of the ATLAS EM barrel and end-cap calorimeter were exposed to electron, photon and pion beams. The performance of the calorimeter with respect to its finely segmented first sampling has been studied. The polar angle resolution has been found to be in the range 50-60 mrad/sqrt(E (GeV)). The neutral pion rejection has been measured to be about 3.5 for 90% photon selection efficiency at pT=50 GeV/c. Electron-pion separation studies have indicated that a pion fake rate of (0.07-0.5)% can be achieved while maintaining 90% electron identification efficiency for energies up to 40 GeV.Comment: 32 pages, 22 figures, to be published in NIM

Hadron Energy Reconstruction for the ATLAS Calorimetry in the Framework of the Non-parametrical Method

This paper discusses hadron energy reconstruction for the ATLAS barrel prototype combined calorimeter (consisting of a lead-liquid argon electromagnetic part and an iron-scintillator hadronic part) in the framework of the non-parametrical method. The non-parametrical method utilizes only the known $e/h$ ratios and the electron calibration constants and does not require the determination of any parameters by a minimization technique. Thus, this technique lends itself to an easy use in a first level trigger. The reconstructed mean values of the hadron energies are within $\pm 1$ of the true values and the fractional energy resolution is $[(58\pm3)/\sqrt{E}+(2.5\pm0.3)$. The value of the $e/h$ ratio obtained for the electromagnetic compartment of the combined calorimeter is $1.74\pm0.04$ and agrees with the prediction that $e/h > 1.7$ for this electromagnetic calorimeter. Results of a study of the longitudinal hadronic shower development are also presented. The data have been taken in the H8 beam line of the CERN SPS using pions of energies from 10 to 300 GeV.Comment: 33 pages, 13 figures, Will be published in NIM