Measurement of the differential t/t production cross section at 13 TeV with CMS in the all-hadronic boosted regime

Celli, Federico (2018) Measurement of the differential t/t production cross section at 13 TeV with CMS in the all-hadronic boosted regime. [Laurea magistrale], Università di Bologna, Corso di Studio in Fisica [LM-DM270]
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Abstract

An inclusive and differential measurement of the t/t production cross section in the all-hadronic channel is presented here, using data from 13 TeV pp collisions, collected by the CMS detector at the LHC in 2016, corresponding to an integrated luminosity of 37 fb−1 . The analysis has been performed in the boosted regime, characterized by high-pT top quarks whose decay products are reconstructed, due to the large Lorentz boost, into two wide jets. The inclusive t/t production cross section has been measured to be σt/t = 572 ± 14(stat) ± 118(syst) ± 14(lumi) pb, a value quite lower than the theoretical prediction. An overestimation of the POWHEG + PYTHIA 8 Monte Carlo selection efficiency could explain this effect. The detector-level differential cross section is then measured as a function of some variables of interest and it is compared to the theoretical predictions. Finally, an unfolding procedure is performed in order to remove detector effects and to extrapolate the differential cross section measurement to the full parton-level phase space.

Abstract
Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Celli, Federico
Relatore della tesi
Scuola
Corso di studio
Indirizzo
Curriculum B: Fisica nucleare e subnucleare
Ordinamento Cds
DM270
Parole chiave
CMS,LHC,Top Quark,Cross Section
Data di discussione della Tesi
23 Marzo 2018
URI

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