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Doctoral Thesis
DOI
https://doi.org/10.11606/T.43.2009.tde-06042009-161521
Document
Author
Full name
Jorge de Oliveira Echeimberg
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2009
Supervisor
Committee
Deppman, Airton (President)
Duarte, Sérgio José Barbosa
Munhoz, Marcelo Gameiro
Nielsen, Marina
Tavares, Odilon Antonio Paula
Title in Portuguese
Medida da seção de choque diferencial do canal de reação 0K+
Keywords in Portuguese
Ajuste cinemático
Espectroscopia nuclear
Ressonância bariônica
Seção de choque
Simulação
Abstract in Portuguese
Neste trabalho são analisados dados experimentais do canal de reação p ! K+0 no intervalo de energias, 1, 0 E < 3, 6GeV (1, 66 W < 2, 76GeV ), para o fóton incidente. Os dados foram tomados durante o experimento G10 na sala-B do Thomas Jefferson National Accelerator Facility (JLab). Na sala-B está localizado o detector espectrômetro CLAS que utiliza um sistema de fótons monitorados aumentando consideravelmente a acurácia na determinação do fóton que gerou um evento no alvo de hidrogênio líquido. Neste estudo foram utilizados dois métodos de análise diferentes, um por meio do ajuste cinemático e o outro através da subtração de fundo somente. O ajuste cinemático procura levar em conta aspectos cinemáticos da reação na seleção dos dados, usando para isso ferramentas estatísticas. Já o método de subtração de fundos separa a região de interesse através de cortes lineares de algumas grandezas relevantes. Com isso, foi obtida a seção de choque diferencial em todo intervalo de energias do fóton incidente e em ângulos cos(CM K+ ) variando de -0.9 a 0.9. A secção de choque total, tot(W) , calculada por meio da análise de ondas parciais mostrou que os resutados encontrados são compatíveis aos dados do SAPHIR, indicando que não há evidências da ressonância P13.
Title in English
Differential cross section measurement for channel of reaction p ! K+0
Keywords in English
Barionic resonance
Cross section
Kinemtatic fit
Nuclear Spectroscopy
Simulation
Abstract in English
This work analyzed the experimental data for the reaction p ! K+0 with incident photon energy of, 1.0 E < 3.6GeV (1, 66 W < 2, 76GeV ). The data were taken during the G10 experiment in Hall-B of the Thomas Jefferson National Accelerator Facility (JLab). In Hall-B is located the CLAS detector spectrometer that uses a system of tagged photons increasing the accuracy in the determination of the photon that generated an event in the target of liquid hydrogen. This study used two different methods of analysis: the kinematic fit and the method of background subtraction. The kinematic fit takes into account kinematic aspects of the reaction in the selection of data, using statistical tools. In the other hand, the subtraction method to separate the background in the region of interest through linear cuts of some relevant quantities. Following it, was obtained the differential cross section in the range of energies of the incident photons and at an angles cos(CM K+ ) ranging from -0.9 to 0.9. The total cross section, tot(W), calculated through Partial Wave analysis, shows that the results are consistent with SAPHIR data, indicating no evidences of P13 resonance.
 
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tese_jorge4.pdf (2.92 Mbytes)
Publishing Date
2009-04-06
 
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