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
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
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
Altri metadati
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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