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Ultimo Urlo - Inviato da: jenkin - Giovedì, 04 Dicembre 2014 17:54
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Riccardo Ciolfi, XXIII Ciclo, 2010 - Relativistic Models of Magnetars

Relativistic Models of Magnetars
(Riccardo Ciolfi - Valeria Ferrari - XXIII Ciclo della Scuola di Dottorato "Vito Volterra" - 2010)





In this Thesis we present the equilibrium magnetar model we have developed. The model is built in the framework of General Relativity, and follows a perturbative approach. It describes a non-rotating strongly magnetized neutron star surrounded by vacuum, with the assumption that the magnetic field acts as a stationary axisymmetric perturbation of a static and spherically symmetric unmagnetized star.
Inside the star we adopt ideal magnetohydrodynamics, i.e. we neglect finite electrical conductivity effects. The above assumptions are quite standard in the literature.

The magnetic field configurations we find reproduce the twisted-torus geometry. Moreover, we include the contribution from the higher (l > 1) multipolar components of ...


Da jenkin, Giovedì, 24 Febbraio 2011 10:56, Commenti(0), Leggi tutto
Alessandro Palma, XXII Ciclo, 2009 - Studies on the dielectron spectrum with the first data of the CMS experiment at the Large Hadron Collider

Studies on the dielectron spectrum with the first data of the CMS experiment at the Large Hadron Collider
(Alessandro Palma - Egidio Longo, Riccardo Paramatti, Paolo Meridiani - XXII Ciclo della Scuola di Dottorato "Vito Volterra" - 2009)





The first part of this work describes how to use Z -> e+e- events in order to calibrate the CMS electromagnetic calorimeter, which makes use of scintillating crystals in order to precisely measure the energy of electrons and photons coming from the proton-proton interactions. Using the very precise knowledge of the Z mass coming from LEP experiments, it is possible to set the absolute scale of the calorimeter as well as calibrating regions of the calorimeter with various topologies, and finely correct the calorimeter response to electrons. Focus is put on the first weeks of data taking.

The second part of this work concentrates ...


Da jenkin, Giovedì, 24 Febbraio 2011 09:40, Commenti(0), Leggi tutto
Sara Borroni, XXIII Ciclo, 2010 - Study of the pp->Z->µ+µ- Process at ATLAS: Detector Performance and First Cross-Section Measurement at 7 TeV

Study of the pp --> Z --> µ+µ- Process at ATLAS
Detector Performance and First Cross-Section Measurement at 7 TeV

(Sara Borroni - Cesare Bini, Stefano Rosati - XXIII Ciclo della Scuola di Dottorato "Vito Volterra" - 2010)






This thesis is focused on the study of the Z --> µ+µ- process. This process is quite interesting. From the detector performance point of view, it can be used to measure from data muon trigger and reconstruction efficiencies. To extract these efficiencies, in the past three years I developed and optimized a method, called Tag&Probe, using Monte Carlo simulation. In the past few months, with the first ATLAS data, it allowed to measure the muon efficiencies from data for the first time. A data sample of 1.3 pb-1 of integrated luminosity has been used and the results have been compared with the MC expectatio ...


Da jenkin, Domenica, 20 Febbraio 2011 09:11, Commenti(0), Leggi tutto


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