Produção de Bósons W e Z em Colisões Próton-Chumbo no LHC

• Ano de defesa: 2021
• Autor(a) principal: Oliveira, Lucas Viana
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Pelotas; Programa de Pós-Graduação em Física; UFPel; Brasil
• Palavras-chave em Português: Bósons W± e Z 0; LHCb; Pseudo-rapidez; PDFs; pp; pA; Bosons W± and Z 0; Pseudo-rapidity; CIENCIAS EXATAS E DA TERRA; FISICA
• Link de acesso: http://guaiaca.ufpel.edu.br/xmlui/handle/prefix/12962

One of the issues of interest in particle physics is the production of the bosons W± and Z 0 , mediators of the weak interaction. This is important because it can help us understand the distributions of quarks and gluons in the proton and nucleus. Therefore, in this work we focus on the production of these bosons through proton-proton and proton lead collisions. We intend to use the kinematic slices for the LHCb detector, which consists of a frontal and asymmetric detector that covers a greater pseudo-rapidity range compared to ALICE, ATLAS and CMS, thus allowing the LHCb to explore nuclear eects in the small x kinematic region . In this analysis, we will obtain the speed distributions for the production cross section of these bosons. And these results will allow us to study the distributions of quarks and gluons in the atomic nucleus, and link the description of nuclear eects. The experimental data that already exist indicate that there are nuclear eects, there is just no xed model to describe these dierent eects. What justies the use of EPPS16 and nCTEQ15 parameterizations in this work. With the help of data from the LHCb, we will be able to determine which parameterization of the nuclear parton distributions best ts the data. Through the data of W± and Z 0 at great rapidity, it was found that nuclear PDFs tend to anti-shadowing and small x shadowing regions, and when calculating the pPb/Pbp ratio regarding the treatment of the kinematic region in small and large x, it was found that there is a reasonable uncertainty in the modeling of nuclear eects predicted by EPPS16 and nCTEQ15. We will show the results for energies of 8.8 TeV and 63 TeV, which represent energies of the LHC and the future FCC respectively.