Saturation physics at HERA and RHIC : an unified description
Autor(a) principal: | |
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Data de Publicação: | 2006 |
Outros Autores: | , , |
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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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 |
dc.date.accessioned.fl_str_mv |
2016-05-24T02:11:08Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
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info:eu-repo/semantics/publishedVersion |
format |
article |
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publishedVersion |
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http://hdl.handle.net/10183/141762 |
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0370-2693 |
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000594531 |
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http://hdl.handle.net/10183/141762 |
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eng |
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eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physics letters. B. Vol. 643, no. 5 (Dec. 2006), p. 273-278 |
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openAccess |
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