Study of the performances of the H->ZZ*->4l analysis with the CMS phase-II upgrade

Borgonovi, Lisa (2015) Study of the performances of the H->ZZ*->4l analysis with the CMS phase-II upgrade. [Laurea magistrale], Università di Bologna, Corso di Studio in Fisica [LM-DM270]
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The performances of the H → ZZ* → 4l analysis are studied in the context of the High Luminosity upgrade of the LHC collider, with the CMS detector. The high luminosity (up to L = 5 × 10^34 cm−2s−1) of the accelerator poses very challenging experimental con- ditions. In particular, the number of overlapping events per bunch crossing will increase to 140. To cope with this difficult environment, the CMS detector will be upgraded in two stages: Phase-I and Phase-II. The tools used in the analysis are the CMS Full Simulation and the fast parametrized Delphes simulation. A validation of Delphes with respect to the Full Simulation is performed, using reference Phase-I detector samples. Delphes is then used to simulate the Phase-II detector response. The Phase-II configuration is compared with the Phase-I detector and the same Phase-I detector affected by aging processes, both modeled with the Full Simulation framework. Conclusions on these three scenarios are derived: the degradation in performances observed with the “aged” scenario shows that a major upgrade of the detector is mandatory. The specific upgrade configuration studied allows to keep the same performances as in Phase-I and, in the case of the four-muons channel, even to exceed them.

Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Borgonovi, Lisa
Relatore della tesi
Corso di studio
Curriculum B: Fisica nucleare e subnucleare
Ordinamento Cds
Parole chiave
Higgs Upgrade CMS Phase-II
Data di discussione della Tesi
27 Marzo 2015

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