Higgs mass determination from direct reconstruction at a Linear e=e- Collider

We study the feasibility of a precise measurement of the mass of a 120 GeV MSM Higgs boson through direct reconstruction of ZH->qqH events that would be achieved in a future e+e- linear collider operating at a center-of-mass energy of 500 GeV. Much effort has been put in a ``realistic simulation'' by including irreducible and reducible backgrounds, realistic detector effects and reconstruction procedures and sophisticated analysis tools involving Neural Networks and kinematical fitting. As a result, the Higgs mass is determined with a statistical accuracy of 50 MeV and the Z-Higgs Yukawa coupling measured to 0.7%, assuming 500 fb^-1 of integrated luminosity.Comment: LaTex, 29 pages, 18 Postscript figure

Towards a precise measurement of the top quark Yukawa coupling at the ILC

A precise measurement of the top quark Yukawa coupling is of great importance, since it may shed light on the mechanism of EWSB. We study the prospects of such measurement during the first phase of the ILC at sqrt(s)=500 GeV, focusing in particular on recent theoretical developments as well as the potential benefits of beam polarization. It is shown that both yield improvements that could possibly lead to a measurement competitive with the LHC.Comment: Invited talk at 2005 International Linear Collider Physics and Detector Workshop and Second ILC Accelerator Workshop, Snowmass, CO (Snowmass05) 3 pages, LaTeX, 3 eps figure

Top Quark Current Experimental Status

Ten years after its discovery at the Tevatron collider, we still know little about the top quark. Its large mass suggests it may play a key role in the mechanism of Electroweak Symmetry Breaking (EWSB), or open a window of sensitivity to new physics related to EWSB and preferentially coupled to it. To determine whether this is the case, precision measurements of top quark properties are necessary. The high statistics samples being collected by the Tevatron experiments during Run II start to incisively probe the top quark sector. This report summarizes the experimental status of the top quark, focusing in particular on the recent measurements from the Tevatron.Comment: 12 pages, 6 figures, 1 table. Talk presented at TOP 2006, International Workshop on Top Quark Physics, Coimbra, Portugal, January 12-15, 2006. To appear in the proceeding

Ressenyes

Index de les obres ressenyades: Étienne BALIBAR, Violence et civilité. Wellek Library Lectures et autres essais de philosophie politique. París: Galilée, 2010

Estudio de la solubilidad del ácido gálico en agua bajo radiación por microondas

El propósito del estudio radica en comprobar si la radiación por microondas afecta al equilibrio sólido-líquido. Para ello se ha realizado un estudio de la solubilidad del ácido gálico bajo radiación y sin radiación. Se escoge una temperatura de 75ºC, con irradiación continua. Dicha temperatura se c0nsigue refrigerando la cavidad del microondas con aire a temperatura ambiente. La potencia final a la que se decide trabajar en el microondas son 50W, y los tiempos por experimento son de 3 horas. En la medida de la solubilidad en ausencia de radiación las condiciones de temperatura y tiempo son similares, y el calentamiento se realiza en un baño termostático de etilenglicol. Para analizar los resultados se ha usado gravimetría. Y para determinar si ha ocurrido degradación térmica, cromatografía de líquidos (HPLC). Los resultados obtenidos no permiten discernir si el equilibrio de solubilidad se ve afectado por la presencia de la radiación.The purpose of the study was to verify if the microwave radiation affects the solid - liquid equilibrium . Gallic acid solubility was measured under microwave radiation and compared with the solubility obtained by conventional heating. Measurements were done at 75 ° C, under continuous microwave irradiation. This temperature was achieved by cooling with air at ambient temperature. A power of 50W was set for 3 hours. In the case of conventional heating experiments, the same temperature and time were used, but the heating was carr9ied out in a thermostatic bath. The results were analysed gravimetrically. HPLC was used to measure to determine if thermal degradation occurred. With the results so obtained, it cannot be assured that the solid - liquid equilibrium is affected.Departamento de Ingeniería Química y Tecnología del Medio AmbienteGrado en Ingeniería Químic