Saturation physics at HERA and RHIC : an unified description

Detalhes bibliográficos
Autor(a) principal: Goncalves, Victor Paulo Barros
Data de Publicação: 2006
Outros Autores: Souza, Maria Simone Kugeratski, Machado, Magno Valério Trindade, Navarra, Fernando Silveira
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRGS
Texto Completo: http://hdl.handle.net/10183/141762
Resumo: One of the frontiers of QCD which are intensely investigated in high energy experiments is the high energy (small x) regime, where we expect to observe the non-linear behavior of the theory. In this regime, the growth of the parton distribution should saturate, forming a color glass condensate (CGC). In fact, signals of parton saturation have already been observed both in ep deep inelastic scattering at HERA and in deuteron-gold collisions at RHIC. Currently, a global description of the existing experimental data is possible considering different phenomenological saturation models for the two processes within the CGC formalism. In this Letter we analyze the universality of these dipole cross section parameterizations and verify that they are not able to describe the HERA and RHIC data simultaneously. We analyze possible improvements in the parameterizations and propose a new parameterization for the forward dipole amplitude which allows us to describe quite well the small-x ep HERA data on F2 structure function as well as the dAu RHIC data on charged hadron spectra. It is an important signature of the universality of the saturation physics.
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spelling Goncalves, Victor Paulo BarrosSouza, Maria Simone KugeratskiMachado, Magno Valério TrindadeNavarra, Fernando Silveira2016-05-24T02:11:08Z20060370-2693http://hdl.handle.net/10183/141762000594531One of the frontiers of QCD which are intensely investigated in high energy experiments is the high energy (small x) regime, where we expect to observe the non-linear behavior of the theory. In this regime, the growth of the parton distribution should saturate, forming a color glass condensate (CGC). In fact, signals of parton saturation have already been observed both in ep deep inelastic scattering at HERA and in deuteron-gold collisions at RHIC. Currently, a global description of the existing experimental data is possible considering different phenomenological saturation models for the two processes within the CGC formalism. In this Letter we analyze the universality of these dipole cross section parameterizations and verify that they are not able to describe the HERA and RHIC data simultaneously. We analyze possible improvements in the parameterizations and propose a new parameterization for the forward dipole amplitude which allows us to describe quite well the small-x ep HERA data on F2 structure function as well as the dAu RHIC data on charged hadron spectra. It is an important signature of the universality of the saturation physics.application/pdfengPhysics letters. B. Vol. 643, no. 5 (Dec. 2006), p. 273-278Cromodinâmica quânticaAltas energiasHera : Acelerador de particulasSaturation physics at HERA and RHIC : an unified descriptionEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000594531.pdf000594531.pdfTexto completo (inglês)application/pdf603108http://www.lume.ufrgs.br/bitstream/10183/141762/1/000594531.pdfb28f64ab9b220d4bad14a49e7a8f0b46MD51TEXT000594531.pdf.txt000594531.pdf.txtExtracted Texttext/plain23240http://www.lume.ufrgs.br/bitstream/10183/141762/2/000594531.pdf.txt0b8bb4850bd3a0a5af65c6e6a1c78b51MD52THUMBNAIL000594531.pdf.jpg000594531.pdf.jpgGenerated Thumbnailimage/jpeg2125http://www.lume.ufrgs.br/bitstream/10183/141762/3/000594531.pdf.jpg55c1783237612e3f364aae1eb459ca78MD5310183/1417622024-02-11 06:04:03.184364oai:www.lume.ufrgs.br:10183/141762Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2024-02-11T08:04:03Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Saturation physics at HERA and RHIC : an unified description
title Saturation physics at HERA and RHIC : an unified description
spellingShingle Saturation physics at HERA and RHIC : an unified description
Goncalves, Victor Paulo Barros
Cromodinâmica quântica
Altas energias
Hera : Acelerador de particulas
title_short Saturation physics at HERA and RHIC : an unified description
title_full Saturation physics at HERA and RHIC : an unified description
title_fullStr Saturation physics at HERA and RHIC : an unified description
title_full_unstemmed Saturation physics at HERA and RHIC : an unified description
title_sort Saturation physics at HERA and RHIC : an unified description
author Goncalves, Victor Paulo Barros
author_facet Goncalves, Victor Paulo Barros
Souza, Maria Simone Kugeratski
Machado, Magno Valério Trindade
Navarra, Fernando Silveira
author_role author
author2 Souza, Maria Simone Kugeratski
Machado, Magno Valério Trindade
Navarra, Fernando Silveira
author2_role author
author
author
dc.contributor.author.fl_str_mv Goncalves, Victor Paulo Barros
Souza, Maria Simone Kugeratski
Machado, Magno Valério Trindade
Navarra, Fernando Silveira
dc.subject.por.fl_str_mv Cromodinâmica quântica
Altas energias
Hera : Acelerador de particulas
topic Cromodinâmica quântica
Altas energias
Hera : Acelerador de particulas
description One of the frontiers of QCD which are intensely investigated in high energy experiments is the high energy (small x) regime, where we expect to observe the non-linear behavior of the theory. In this regime, the growth of the parton distribution should saturate, forming a color glass condensate (CGC). In fact, signals of parton saturation have already been observed both in ep deep inelastic scattering at HERA and in deuteron-gold collisions at RHIC. Currently, a global description of the existing experimental data is possible considering different phenomenological saturation models for the two processes within the CGC formalism. In this Letter we analyze the universality of these dipole cross section parameterizations and verify that they are not able to describe the HERA and RHIC data simultaneously. We analyze possible improvements in the parameterizations and propose a new parameterization for the forward dipole amplitude which allows us to describe quite well the small-x ep HERA data on F2 structure function as well as the dAu RHIC data on charged hadron spectra. It is an important signature of the universality of the saturation physics.
publishDate 2006
dc.date.issued.fl_str_mv 2006
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dc.relation.ispartof.pt_BR.fl_str_mv Physics letters. B. Vol. 643, no. 5 (Dec. 2006), p. 273-278
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