Femtoscopy with strange particles in pPb collisions at √sNN = 8.16 TeV at CMS

• Ano de defesa: 2021
• Autor(a) principal: Lemos, Dener de Souza
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Femtoscopy; Strange particles; Strong interaction; Small colliding systems; Femtoscopia; Partículas estranhas; Interação forte; Sistemas pequenos de colisão
• Link de acesso: http://hdl.handle.net/11449/217847

Femtoscopy is a powerful method for probing the space-time dimensions of particle emitting sources created in high energy collisions through particle correlations. Such correlations are sensitive to the quantum statistics obeyed by the identical particles involved, as well as to the strong interaction felt by hadrons, for both identical or non-identical pairs. This work presents results of femtoscopic correlations for all pair combinations of K0S, Λ and Λbar with data from the LHC Run 2 collected by the Compact Muon Solenoid (CMS) experiment in proton-lead collisions at √sNN = 8.16 TeV. Detailed studies of the femtoscopic correlations are performed employing the single ratio technique of particles from the same event to those from different events, together with other data driven methods employed to extract the desired information. The Lednicky-Lyubolshitz model is used to parametrize the strong interactions, allowing to obtain the scattering observables, as well as the size of the particle emitting region. The present analysis is performed using samples of events in a wide range of charged particle multiplicities and pair average transverse momenta. This is the first femtoscopic correlation measurement of K0SK0S in pPb collisions and the first ΛΛbar and K0SΛ ⊕ K0SΛbar correlation results in small colliding systems. In the study of the strong interactions using femtoscopy of baryon-antibaryon pair, an anticorrelation is observed, whereas the opposite behavior is seen in the case of baryon-baryon pair correlations, both observations being consistent with previous measurements. Furthermore, the baryon-antibaryon scattering parameters showed an independent behavior with respect to charged particle multiplicity.