Study of associated production of ϒ and D*± in pp collisions at √s = 13 TeV with the CMS detector at LHC and contributions for the maintenance, performance and upgrade of the RPC system

• Ano de defesa: 2023
• Autor(a) principal: Amarilo, Kevin Mota
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Universidade do Estado do Rio de Janeiro; Centro de Tecnologia e Ciências::Instituto de Física Armando Dias Tavares; Brasil; UERJ; Programa de Pós-Graduação em Física
• Palavras-chave em Português: Collisions (Nuclear physics); Compact muon solenoid; Large Hadron Collider (France and Switzerland); Quantum chromodynamics; Multiple parton scattering; Resistive plate chambers; Colisões (Física nuclear); Solenóide de múon compacto; Grande colisor de hádrons (França e Suíça); Cromodinâmica quântica; Múltiplo espalhamento partônico; Câmara de placas resistivas; CIENCIAS EXATAS E DA TERRA::FISICA::FISICA DAS PARTICULAS ELEMENTARES E CAMPOS
• Link de acesso: http://www.bdtd.uerj.br/handle/1/20911

This work presents the analysis of the associated production of ϒ and D*± using pp collision data collected by CMS, at √s = 13 TeV, with integrated luminosity of 123 fb¯¹. The associated production of ϒ and open charm hadrons is considered a golden channel to study the double-parton scattering (DPS), as the single-parton scattering contribution (SPS) is expected to be negligible. The reconstruction of the two mesons is done through ϒ (nS) → μ⁺μ¯ and D*⁺→ D°π⁺→ K¯π⁺π⁺ decay channels. A fiducial cross section for the ϒ + D* production is measured and, by assuming that the production occurs exclusively via DPS, a lower limit of the effective cross section of 7.5±1.1 mb is obtained. Apart from the analysis, this document also discuss the work done for the CMS RPC project on the maintenance and commissioning, in preparation for the new data taking period (Run 3), and the R&D of the new iRPC detectors expected to be installed in CMS during the Phase 2 upgrade.