Comandini, Devis
(2019)
Prospects for the Higgs boson self-coupling measurement with the Phase-II CMS detector upgrade using simulated pp collisions at √s = 27 TeV (High Energy LHC).
[Laurea magistrale], Università di Bologna, Corso di Studio in
Fisica [LM-DM270]
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Abstract
The performance of the HH->bbZZ (l) (l = e, mu) analysis is presented considering the possible High Energy upgrade of the LHC collider, at a center-of-mass energy of √s = 27 TeV and with an integrated luminosity of 15000 fb^{-1}; a comparison of the results with the same study performed in the context of the High Luminosity LHC, at a center-of-mass energy of √s =14 TeV and with an integrated luminosity of 3000 fb^{-1}, is also reported. The Phase-II upgraded CMS detector, expected in 2024, is assumed in both the scenarios. The analysis is fully based on Monte Carlo simulations: the parton-level generation of signal and backgrounds is performed with MADGRAPH5_AMC@NLO, while parton showering and hadronization are achieved with PYTHIA8; the detector response is then obtained in the parametric framework provided by DELPHES. A limit on the di-Higgs signal strength of r =1.45 is estimated at 95% CL in the inclusive bb4l channel, with a corresponding signal significance of 1.43 σ. A study on the prospects for the measurements of the Higgs self-coupling (λ_3) is also performed: the projected confidence interval on k_λ = λ_3/λ_3^{SM} is found to be [-0.7,7.2] at the 95% CL.
Abstract
The performance of the HH->bbZZ (l) (l = e, mu) analysis is presented considering the possible High Energy upgrade of the LHC collider, at a center-of-mass energy of √s = 27 TeV and with an integrated luminosity of 15000 fb^{-1}; a comparison of the results with the same study performed in the context of the High Luminosity LHC, at a center-of-mass energy of √s =14 TeV and with an integrated luminosity of 3000 fb^{-1}, is also reported. The Phase-II upgraded CMS detector, expected in 2024, is assumed in both the scenarios. The analysis is fully based on Monte Carlo simulations: the parton-level generation of signal and backgrounds is performed with MADGRAPH5_AMC@NLO, while parton showering and hadronization are achieved with PYTHIA8; the detector response is then obtained in the parametric framework provided by DELPHES. A limit on the di-Higgs signal strength of r =1.45 is estimated at 95% CL in the inclusive bb4l channel, with a corresponding signal significance of 1.43 σ. A study on the prospects for the measurements of the Higgs self-coupling (λ_3) is also performed: the projected confidence interval on k_λ = λ_3/λ_3^{SM} is found to be [-0.7,7.2] at the 95% CL.
Tipologia del documento
Tesi di laurea
(Laurea magistrale)
Autore della tesi
Comandini, Devis
Relatore della tesi
Correlatore della tesi
Scuola
Corso di studio
Indirizzo
Curriculum B: Fisica nucleare e subnucleare
Ordinamento Cds
DM270
Parole chiave
Higgs boson,BSM theories,di-Higgs analysis,MC simulations,LHC upgrade,CMS detector,CMS upgrade
Data di discussione della Tesi
19 Luglio 2019
URI
Altri metadati
Tipologia del documento
Tesi di laurea
(NON SPECIFICATO)
Autore della tesi
Comandini, Devis
Relatore della tesi
Correlatore della tesi
Scuola
Corso di studio
Indirizzo
Curriculum B: Fisica nucleare e subnucleare
Ordinamento Cds
DM270
Parole chiave
Higgs boson,BSM theories,di-Higgs analysis,MC simulations,LHC upgrade,CMS detector,CMS upgrade
Data di discussione della Tesi
19 Luglio 2019
URI
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