636 research outputs found
Triggering on hadronic tau decays in ATLAS: semiconductor tracking detectors in action
No full textHadronic tau decays play a crucial role in taking Standard Model measurements as well as in the search for physics beyond the Standard Model. However, hadronic tau decays are difficult to identify and trigger on due to their resemblance to QCD jets. Given the large production cross section of QCD processes, designing and operating a trigger system with the capability to efficiently select hadronic tau decays, while maintaining the rate within the bandwidth limits, is a difficult challenge. This contribution will summarize the status and performance of the ATLAS tau trigger system during the 2011 data taking period, emphasizing the key role of semiconductor tracking detectors for tracking and vertexing. Different methods that have been explored to obtain the trigger efficiency curves from data will be shown. Finally, in light of the vast statistics collected in 2011, future prospects for triggering on hadronic tau decays in this exciting new period of increased instantaneous luminosity will be presented
ATLAS online data quality monitoring
No full textWith the delivery of the first proton-proton collisions by the LHC, the ATLAS collaboration had the opportunity to operate the detector under the environment it was designed for. These first events have been of great interest not only for the high energy physics outcome, but also as a means to perform a general commissioning of system. A highly scalable distributed monitoring framework assesses the quality of the data and the operational conditions of the detector, trigger and data acquisition system. Every minute of an ATLAS data taking session the monitoring framework serves several thousands physics events to monitoring data analysis applications, handles millions of histogram updates coming from thousands applications, executes over forty thousand advanced data quality checks for a subset of those histograms, displays histograms and results of these checks on several dozens of monitors installed in main and satellite ATLAS control rooms. The online data quality monitoring system has been of great help in providing quick feedback to the subsystems about the functioning and performance of the different parts of ATLAS by providing a configurable easy and fast visualization of all this information. The Data Quality Monitoring Display (DQMD) is a visualization tool for the automatic data quality assessment of the ATLAS experiment. It is the interface through which the shift crew and experts can validate the quality of the data b eing recorded or processed, be warned of problems related to data quality, and identify the origin of such problems. The display is designed to work both online within the trigger and data acquisition (tdaq) environment, offline at the various tiers for processing of data, or privately by experts. This tool allows great flexibility for visualization of histograms, with an overlay of reference histograms when applicable, configurations used for automatic checking of those histograms, and the results. The display configuration is stored in a database, that can be easily created and edited with the Data Quality Monitoring Configurator (DQMC) tool. The first weeks of collisions data taking turned into a very successful experience for the monitoring framework and translated into several improvements to easy usability and efficient information transfer. A description of the design and implementation of the DQMD and DQMC will be presented, as well as the performance of the monitoring framework during the first ATLAS run and the recent upgrades concerning alarm handling and parameters finding
Triggering on hadronic tau decays in ATLAS
No full textHadronic tau decays play a crucial role in taking Standard Model measurements as well as in the search for physics beyond the Standard Model. However, hadronic tau decays are difficult to identify and trigger on due to their resemblance to QCD jets. Given the large production cross section of QCD processes, designing and operating a trigger system with the capability to efficiently select hadronic tau decays, while maintaining the rate within the bandwidth limits, is a difficult challenge. This contribution will summarize the status and performance of the ATLAS tau trigger system during the 2011 data taking period, emphasizing the key role of semiconductor tracking detectors for tracking and vertexing. Different methods that have been explored to obtain the trigger efficiency curves from data will be shown. Finally, in light of the vast statistics collected in 2011, future prospects for triggering on hadronic tau decays in this exciting new period of increased instantaneous luminosity will be presented
Enyego d’Àvalos (c. 1414-1484), el príncep de Viana i la nova translatio de l’Ètica nicomaquea d’Aristòtil
No full textWe will present the relationship between the manuscript British Library, Harley
3305, owned by Enyego D’Àvalos, and the Spanish translation of Aristotle’s Nicomachean
Ethics by Charles from Aragon, Prince of Viana, during his stay at the Neapolitan court
of Alfons el Magnànim between 1457 and 1458. The study of the critical loci of Bruni’s nova
translatio copied in the Harley manuscript 3305 will lead us to rule out the possibility that
it is the Latin model of the version written by the Prince of Viana.Presentaremos las relaciones entre el manuscrito Harley 3305 de la British
Library, propiedad de Enyego d’Àvalos, y la traducción castellana de la Ética nicomáquea de
Aristóteles realizada por Carlos de Aragón, príncipe de Viana, durante su estancia en la
corte napolitana de Alfonso el Magnánimo entre los años 1457 y 1458. El estudio de los loci
critici de la nueva translatio de Bruni copiada en el manuscrito Harley 3305 nos hará
descartar la posibilidad de que sea el modelo latino de la versión remansada por el príncipe
de Viana
Vestigios altomedievales procedentes de las aguas de Ibiza/Eivissa (Islas Baleares)
No full textInformation referring to medieval navigation, compared with the findings of classical times, is very limited. Here is presented present a bronze candelabrum from Caliphate Period recovered by a diver along the west coast of the island of Ibiza (Balearic Islands). As well as other archaeological remains from early medieval times. In general, mentions of underwater archaeological finds related to this period are very score, not only in western Mediterranean waters and, with rare exceptions, not very consistent. With the following notes on the bronze candelabrum, the author is not presenting an exception. However, this rare piece deserves to be catalogued as accurately as possible within its historical and archaeological context, even though it is chance finding.Al referirse a la navegación medieval es casi un tópico hacer mención de la escasa información disponible, sobre todo si se compara con los hallazgos de época clásica. Se presenta en este estudio un almenar de bronce de época califal recuperado por un submarinista en un lugar de la costa occidental de la isla de Ibiza/Eivissa (Baleares), presentando al mismo tiempo también otros vestigios arqueológicos de época altomedieval de importancia marítima. En general, y no solo en lo relativo al Mediterráneo Occidental, las menciones sobre hallazgos arqueológicos submarinos relacionados con esta época son muy escasas y, salvo excepciones, poco reveladoras. Con la siguiente nota sobre un almenar de bronce el autor no presenta una excepción. Sin embargo, visto que se trata de una pieza singular vale la pena y el esfuerzo de situarla dentro de lo posible en su contexto histórico-arqueológico, aunque en realidad se trate de un hallazgo fortuito
Data Quality Monitoring Display for ATLAS experiment
No full textThe start of collisions at the LHC brings with it much excitement and many unknowns. It’s essential at this point in the experiment to be prepared with user-friendly tools to quickly and efficiently determine the quality of the data. Easy visualization of data for the shift crew and experts is one of the key factors in the data quality assessment process. The Data Quality Monitoring Display (DQMD) is a visualization tool for the automatic data quality assessment of the ATLAS experiment. It is the interface through which the shift crew and experts can validate the quality of the data being recorded or processed, be warned of problems related to data quality, and identify the origin of such problems. This tool allows great flexibility for visualization of results from automatic histogram checking through custom algorithms, the configuration used to run the algorithms, and histograms used for the check, with an overlay of reference histograms when applicable. The display also supports visualization of the results in graphical form ie hardware view of the detector to easily detect faulty channels or modules. It provides the shift crew with a checklist before the final assessment of the data is saved to the database, a list of experts to contact in case of problems, and actions to perform in case of failure. This paper describes the design and implementation of the DQMD and discusses experience from its usage and performance durin g ATLAS commissioning with cosmic ray and single beam data
La recepción de la obra de Jean-Baptiste Say en España: la teoría económica del empresario
No full textEste trabajo analiza la difusión de la teoría del empresario de Jean-Baptiste Say
en España, como último eslabón de una línea de pensamiento que tiene su origen
en Richard Cantillon. Se prueba que la particularidad de este autor es su gran difusión
en el siglo XIX español –siendo uno de los más traducidos– y la escasa
influencia de su teoría económica del empresario. Explicamos las razones de una
paradoja que deja sin fundamentos teóricos a cualquier política económica destinada
al desarrollo del tejido empresarial nacional. Son presentados los mecanismos
de difusión, tanto directos, por medio de traducciones, como indirectos, por
medio de autores españoles que pudieron difundir esta teoría de la función empresarial.
Nos interesa conocer la recepción por parte de los autores españoles de
la teoría del empresario de Say, determinar su grado de comprensión, de interpretación
en relación con la realidad nacional, de revisión teórica, e incluso conocer
si la fuente real de la idea a transmitir es el propio autor o alguna otra.This paper illustrates the spread of Jean-Baptiste Say’s entrepreneur theory in Spain –a last contribution within the French tradition in which Richard Cantillon and A. R. J. Turgot were predecessors. We attempt to demonstrate that this is a special case, because, even though J. B. Say was the most important author from a publishing point of view, his economic theory of entrepreneurship had very little influence. The spread of economic ideas by way of translation and Spanish authors which employed J. B. Say’s economic theory, give possible explanations to a
paradox which had left economic policy without a theoretical reference. We analyse how Say’s entrepreneur theory was received among Spanish authors in the 19th century, its degree of comprehension and the analytical additions made, and attempt to identify the real source of transmission
ATLAS online data quality monitoring
No full textEvery minute the ATLAS detector is taking data, the monitoring framework serves several thousands physics events to monitoring data analysis applications, handles millions of histogram updates coming from thousands applications, executes over forty thousand advanced data quality checks for a subset of those histograms, displays histograms and results of these checks on several dozens of monitors installed in main and satellite ATLAS control rooms. The online data quality monitoring system has been of great help in providing quick feedback to the subsystems about the functioning and performance of the different parts of ATLAS by providing a configurable easy and fast visualization of all this information. The Data Quality Monitoring Display (DQMD) is a visualization tool for the automatic data quality assessment of the ATLAS experiment. It is the interface through which the shift crew and experts can validate the quality of the data being recorded or processed, be warned of problems related to data quality, and identify the origin of such problems. The display is designed to work both online within the trigger and data acquisition (tdaq) environment, offline at the various tiers for processing of data, or privately by experts. This tool allows great flexibility for visualization of histograms, with an overlay of reference histograms when applicable, configurations used for automatic checking of those histograms, and the results. The display configuration is stored in a database, that can be easily created and edited with the Data Quality Monitoring Configurator (DQMC) tool. The first weeks of collisions data taking turned into a very successful experience for the monitoring framework and translated into several improvements to easy usability and efficient information transfer. A description of the design and implementation of the DQMD and DQMC will be presented, as well as the performance of the monitoring framework during the first ATLAS run and the recent upgrades
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