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
| Identifer | oai:union.ndltd.org:unibo.it/oai:amsdottorato.cib.unibo.it:852 |
| Date | 05 June 2008 |
| Creators | Codispoti, Giuseppe <1979> |
| Contributors | Castro, Andrea |
| Publisher | Alma Mater Studiorum - Università di Bologna |
| Source Sets | Università di Bologna |
| Language | English |
| Detected Language | English |
| Type | Doctoral Thesis, PeerReviewed |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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