Аннотация:A search for nonresonant Higgs boson pair production on full Run 2 data collected by the Compact Muon Solenoid (CMS) detector during proton-proton running of the Large Hadron Collider (LHC) is presented. The data collected during Run 2 totaled an integrated luminosity of 138 fb$^{-1}$ at a center-of-mass energy of 13 TeV. The final state considered is bbZZ(llqq) in which di-Higgs decays to two b quarks and two Z bosons, where one Z boson decays leptonically and the other hadronically. This search for nonresonant Higgs boson pair production includes the Standard Model production via gluon fusion. In addition, the search includes the production cross section of anomalous Higgs boson couplings and Beyond the Standard Model (BSM) interpretations with 20 Effective Field Theory (EFT) scenarios. Studies for resonant production are also presented. An expected upper limit is set at the 95\% confidence level on nonresonant Higgs boson pair production of 529 times the Standard Model, and an expected 1$\sigma$ constraint is set on $\kappa_{\lambda}$ to the range of -39.26 to 38.08. Expected upper limits at the 95\% confidence level are set on 20 EFT benchmark scenarios ranging from 1.8 to 7.9 pb. Work on the CMS Muon system during the Long Shutdown 2 and Run 3 commissioning periods of the LHC and in preparation for High Luminosity LHC (HL-LHC) is also presented. Machine learning techniques, such as Boosted Decision Trees, Parameterized Neural Networks, and Autoencoders, were implemented to improve detector performance and physics analysis sensitivity.--Author's abstract
Ключевые слова:Particle physics theoretical and experimental studies, Particle Detector Development and Performance, Computational Physics and Python Applications
