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Doctoral Thesis
DOI
https://doi.org/10.11606/T.43.2009.tde-17082009-095658
Document
Author
Full name
Marisílvia Donadelli
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2009
Supervisor
Committee
Dietzsch, Olacio (President)
Begalli, Márcia
Chinellato, Carola Dobrigkeit
Padula, Sandra dos Santos
Suaide, Alexandre Alarcon do Passo
Title in Portuguese
Medidas da produção de J/, ' e polarização de J em colisões p+p a s = 200 GeV com o detector PHENIX
Keywords in Portuguese
Colisões ultra relativisticas
Física de colisores
Produção de charmônio
Abstract in Portuguese
A produção de J/, e 0 em colisões p+p a uma energia no referencial do centro de massa (ps) de 200 GeV foi estudada no Experimento PHENIX no RHIC. A amostra de dados coletada durante o período de aquisição de 2006 permitiu não somente a determinação das seções de choque absolutas, mas também o estudo da polarização de J/, através de seu decaimento no canal de dieltrons em região de rapidez central. As medidas incluem a dependência com o momento transverso e são comparadas com aquelas de outros experimentos em diferentes intervalos de rapidez e energias de colisão, e com previsões teóricas. A medida da polarização de J/, deve trazer limitações aos mecanismos de formação de charmonium e a medida de feed-down de J/, s provenientes de ´ é de importância para o entendimento da produção prompt de J/, assim como para a supressão observada em colisões A+A no RHIC.
Title in English
Measurement of J/´psi´e ´psi´ production and J/´psi polarization im p+p collisions at ´(s pot.1/2)´ with the phenix detector
Keywords in English
Charmonium production
Collider physics
Ultra relativistic collisions
Abstract in English
The production of J/´psi´e ´psi´collisions at the nucleon center of mass energy ´(s pot.1/2)´ have been studied in the PHENIX Experiment at RHIC. The sample collected during the 2006 data taking period allowed not only the determination of absolute cross sections but also the study of J= polarization through its decays into the dielectron channel at mid rapidity. The measurements include transverse momentum dependence and are compared to that of other experiments in different rapidity ranges and collision energies and to theoretical model predictions. The J= polarization results should provide a constraint on charmonium formation mechanisms and the measurement of the feed down of 0 to J= is of importance for understanding prompt J= production as well as the suppression observed in A+A collisions at RHIC.
 
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tese_marisilvia.pdf (14.16 Mbytes)
Publishing Date
2009-09-14
 
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