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Master's Dissertation
DOI
10.11606/D.43.2006.tde-08062015-162952
Document
Author
Full name
Thiago Simonetti Fleury
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2006
Supervisor
Committee
Eboli, Oscar Jose Pinto (President)
Albuquerque, Ivone Freire da Mota e
Gregores, Eduardo de Moraes
Title in Portuguese
Hadroprodução de charmonium
Keywords in Portuguese
Cromodinâmica quântica
Física de partículas
Hadroprodução
Quarks pesados
Abstract in Portuguese
Neste trabalho, nós estudamos a hadroprodução de charmonium em experimentos de alvo fixo com os três modelos: modelo de singleto de cor (CSM), modelo de evaporação de cor (CEM) e QCD não relativística (NRQCD). Os ajustes feitos aos dados experimentais nos permitiram concluir que o CSM subestima o valor da seção de choque de produção dos estados de charmonium J/ e (2S) e, portanto, não descreve adequadamente a hadroprodução nestes casos. Os modelos CEM e NRQCD por outro lado descreveram satisfatoriamente os dados, no entanto, o fato dos resultados experimentais possuírem grandes incertezas não nos permitiu comparar diretamente os dois modelos e desta forma concluir qual dos dois é mais adequado.
Title in English
Charmonium hadro-production
Keywords in English
Hadro-production
Heavy quarks
Particle physics
Quantum chromodynamics
Abstract in English
ln this work we evaluate the charmonium production at fixed-target experiments with three different models: the color singlet model (CSM), the color evaporation model (CEM) and the nonrelativistic quantum chromodynamics (NRQCD). We verify that the results of CSM under-preditcs the production cross-section for J / and (2S), thus, in this case, the CSM is an inadequate model. In addition, we find that the two models CEM and NRQCD satisfactorily predict the charmonium hadro-production. However, due to the fact that the experimental uncertainties are large we can not compare the two models.
 
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Fleury_2006.pdf (5.34 Mbytes)
Publishing Date
2015-06-17
 
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