• JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
 
  Bookmark and Share
 
 
Master's Dissertation
DOI
10.11606/D.43.2012.tde-26032013-152519
Document
Author
Full name
Jose Luis La Rosa Navarro
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2012
Supervisor
Committee
Leite, Marco Aurelio Lisboa (President)
Begalli, Márcia
Munhoz, Marcelo Gameiro
Title in Portuguese
Estudo da multiplicidade de partículas carregadas em colisões centrais Pb+Pb a SNN = 2.76 TeV no experimento ATLAS
Keywords in Portuguese
atlas
colisões de íons pesados
multiplicidade
Abstract in Portuguese
Dentre os observáveis globais que permitem caracterizar a colisão entre íons pesados relativísticos, a multiplicidade de partículas é uma das variáveis mais fundamentais, diretamente ligada à densidade de energia da colisão. Serão apresentados resultados do estudo de multiplicidade de partículas carregadas para colisões centrais entre íons de chumbo a energias de 2.76 TeV (energia no centro de massa) utilizando o detector ATLAS no Large Hadron Collider (LHC). A multiplicidade na produção de partículas carregadas é medida utilizando dois métodos diferentes entre o intervalo de pseudorapidez || < 2.5 empregando o sistema de detectores semicondutores centrais de trajetórias do ATLAS. A seleção de eventos é crucial para esta análise e é aplicada a dados obtidos através de um trigger de minimum bias, impondo-se a coincidência entre o sinal do calorímetro de zero grau (ZDC) (|| > 8.3) e a coincidência entre o sinal do Minimum Bias Trigger Scintilator (MBTS) (2.1< || <3.8), de forma a remover da amostra de dados os eventos decorrentes da dissociação eletromagnética. Neste trabalho, eventos produzidos pelo gerador de eventos HIJING também foram analisados e os dados simulados reconstruídos utilizando-se os mesmos algoritmos empregados na análise dos dados reais. A multiplicidade e a densidade inclusiva de partículas foram medidas para as colisões mais centrais e estão em bom acordo com os resultados obtidos por outros experimentos.
Title in English
Study of central collision charged particle multiplicity in Pb-Pb collisions at SNN=2,76 TeV on atlas experiment
Keywords in English
atlas
heavy ions collisions
multiplicity
Abstract in English
From the global observables that allows the characterization of the heavy ion collisions at relativistic energies, the particle multiplicity is one of the most fundamental observables, directly related to the energy density of the collision. There will be presented results about the study of central collision charged particle multiplicity in Pb - Pb collisions at the 2.76 TeV center of mass energy using the ATLAS detector at the Large Hadron Collider (LHC). The particle multiplicity is measured using two different methods in the || < 2:5 rapidity interval, deploying the ATLAS inner tracker semiconductor system. The event selection plays a crucial role in this analysis and is applied on data acquired using a minimum bias trigger. Imposing the condition of coincidence between the two Zero Degree Calorimeters (ZDC) arms (|| > 8.3) and the coincidence of the Minimum Bias Trigger Scintillator (MBTS) detector (2.1 < || <3.8) the electromagnetic dissociation events are removed from the sample. For this work, events produced by the HIJING event generator were also analyzed and the simulated data was reconstructed using the same algorithms used on data. The multiplicities and inclusive particle density measured for most central collisions are in good agreement with the ones measured by other experiments.
 
WARNING - Viewing this document is conditioned on your acceptance of the following terms of use:
This document is only for private use for research and teaching activities. Reproduction for commercial use is forbidden. This rights cover the whole data about this document as well as its contents. Any uses or copies of this document in whole or in part must include the author's name.
Tesis.pdf (9.17 Mbytes)
Publishing Date
2013-05-29
 
WARNING: Learn what derived works are clicking here.
All rights of the thesis/dissertation are from the authors
Centro de Informática de São Carlos
Digital Library of Theses and Dissertations of USP. Copyright © 2001-2021. All rights reserved.