Amorim, AntónioNeves, Ricardo Manuel Ramos dos Santos2010-07-272010-07-272008http://catalogo.ul.pt/F/?func=item-global&doc_library=ULB01&type=03&doc_number=000559221http://hdl.handle.net/10451/1247Tese de mestrado em Física (Física Nuclear e Partículas), apresentada à Universidade de Lisboa, através da Faculdade de Ciências, 2008Resumo alargado disponível em portuguêsThe work presented here results from a collaboration with two parts of the Trigger and Data Acquisition (TDAQ) project of the ATLAS experiment, at CERN, Switzerland. Firstly, in collaboration with the group responsible for selecting B-physics events at the Trigger system, I studied the possibility of triggering the channel B → J/ψ→e+e-. The variables used to select these events were investigated and a selection algorithm implemented to achieve the best efficiency whilst maintaining tolerable background rates. Secondly, a method for browsing monitoring histograms databases was developed. This application called NODE can be access histograms through a graphical user interface. It was developed within the framework of the TDAQ Monitoring Working Group.application/pdfengFísica nuclearPartículasmaster thesis