Sensitivity of the Top quark mass measurement with the CMS experiment at LHC using t-tbar multijet simulated events

Codispoti, Giuseppe (2008) Sensitivity of the Top quark mass measurement with the CMS experiment at LHC using t-tbar multijet simulated events, [Dissertation thesis], Alma Mater Studiorum Università di Bologna. Dottorato di ricerca in Fisica, 20 Ciclo. DOI 10.6092/unibo/amsdottorato/852.
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Abstract

This thesis comes after a strong contribution on the realization of the CMS computing system, which can be seen as a relevant part of the experiment itself. A physics analysis completes the road from Monte Carlo production and analysis tools realization to the final physics study which is the actual goal of the experiment. The topic of physics work of this thesis is the study of tt events fully hadronic decay in the CMS experiment. A multi-jet trigger has been provided to fix a reasonable starting point, reducing the multi-jet sample to the nominal trigger rate. An offline selection has been provided to reduce the S/B ratio. The b-tag is applied to provide a further S/B improvement. The selection is applied to the background sample and to the samples generated at different top quark masses. The top quark mass candidate is reconstructed for all those samples using a kinematic fitter. The resulting distributions are used to build p.d.f.’s, interpolating them with a continuous arbitrary curve. These curves are used to perform the top mass measurement through a likelihood comparison

Abstract
Tipologia del documento
Tesi di dottorato
Autore
Codispoti, Giuseppe
Supervisore
Co-supervisore
Dottorato di ricerca
Ciclo
20
Coordinatore
Settore disciplinare
URN:NBN
DOI
10.6092/unibo/amsdottorato/852
Data di discussione
5 Giugno 2008
URI

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