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Antiproton production in proton on helium collisions at the AMBER Experiment
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Resumo(s)
In this thesis, data collected in the CERN AMBER is used to measure the differential cross-section ratios for hadrons such as pions, kaons, and protons/antiprotons. This study is based on the premise that Dark Matter is massive and can decay into or interact with standard model matter via the weak force (WIMPs). Thus, measuring an excess of antimatter particle fluxes, with respect to that expected from "common" physics sources, would provide indirect evidence for Dark Matter. Such fluxes are measured in Earth orbit experiments like AMS. The results’ interpretation relies on the precise knowledge of namely proton on helium collisions, one of the most frequent sources of antimatter occurring in the interstellar space. AMBER is a fixed target experiment using a proton beam of 190 GeV. Data was taken during the period W01 of the 2023 Run. During the analysis of this data new selection criteria for filtering hadrons were used, to improve the sample quality and size. A Monte Carlo (MC) simulation was used to calculate the acceptance of the AMBER experiment. The MC simulation was also used to aid in the decision of the cross-section binning in momentum and transverse momentum of the produced hadrons, and the (X,Y) and Z position of their primary vertices. To account for errors in the particle identification process performed by the RICH detector and obtain the true particle counts for each bin, a procedure was performed that consists in applying the inverse of a matrix with the probability of true identification, as well as the probability of mis-identifications for each hadron type considered, called RICH unfolding. Cross-sections were calculated in arbitrary units for each hadron, since luminosity correction was not applied. The computation of the cross-section ratios between the two charges of a given hadron type were obtained.
Descrição
Tese de Mestrado, Engenharia Física, 2025, Universidade de Lisboa, Faculdade de Ciências
Palavras-chave
dark matter search antimatter production fixed target experiment AMBER antiprotons