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Contact interactions in D-brane models

We compute the tree-level four-point scattering amplitudes in string models where matter fields live on D-brane intersections. Extracting the contribution of massless modes, we are left with dimension-six four-fermion operators which in general receive contributions from three different sources: exc...

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Detalles Bibliográficos
Autores principales: Antoniadis, Ignatios, Benakli, K., Laugier, A.
Lenguaje:eng
Publicado: 2000
Materias:
Acceso en línea:https://dx.doi.org/10.1088/1126-6708/2001/05/044
http://cds.cern.ch/record/478920
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author Antoniadis, Ignatios
Benakli, K.
Laugier, A.
author_facet Antoniadis, Ignatios
Benakli, K.
Laugier, A.
author_sort Antoniadis, Ignatios
collection CERN
description We compute the tree-level four-point scattering amplitudes in string models where matter fields live on D-brane intersections. Extracting the contribution of massless modes, we are left with dimension-six four-fermion operators which in general receive contributions from three different sources: exchange of massive Kaluza--Klein excitations, winding modes and string oscillator states. We compute their coefficients and extract new bounds on the string scale in the brane-world scenario. This is contrasted with the situation where matter fields arise from open strings with both ends confined on the same collection of D-branes, in which case the exchange of massive string modes leads to dimension-eight operators that have been studied in the past. When matter fields live on brane intersections, the presence of dimension-six operators increase the lower bound on the string scale to 1--2 TeV, independently of the number of large extra dimensions.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2000
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spelling cern-4789202023-03-14T17:08:46Zdoi:10.1088/1126-6708/2001/05/044http://cds.cern.ch/record/478920engAntoniadis, IgnatiosBenakli, K.Laugier, A.Contact interactions in D-brane modelsParticle Physics - TheoryWe compute the tree-level four-point scattering amplitudes in string models where matter fields live on D-brane intersections. Extracting the contribution of massless modes, we are left with dimension-six four-fermion operators which in general receive contributions from three different sources: exchange of massive Kaluza--Klein excitations, winding modes and string oscillator states. We compute their coefficients and extract new bounds on the string scale in the brane-world scenario. This is contrasted with the situation where matter fields arise from open strings with both ends confined on the same collection of D-branes, in which case the exchange of massive string modes leads to dimension-eight operators that have been studied in the past. When matter fields live on brane intersections, the presence of dimension-six operators increase the lower bound on the string scale to 1--2 TeV, independently of the number of large extra dimensions.We compute the tree-level four-point scattering amplitudes in string models where matter fields live on D-brane intersections. Extracting the contribution of massless modes, we are left with dimension-six four-fermion operators which in general receive contributions from three different sources: exchange of massive Kaluza--Klein excitations, winding modes and string oscillator states. We compute their coefficients and extract new bounds on the string scale in the brane-world scenario. This is contrasted with the situation where matter fields arise from open strings with both ends confined on the same collection of D-branes, in which case the exchange of massive string modes leads to dimension-eight operators that have been studied in the past. When matter fields live on brane intersections, the presence of dimension-six operators increases the lower bound on the string scale to 2--3 TeV, independently of the number of large extra dimensions.hep-th/0011281CERN-TH-2000-344CPHT-S092-11-00MCGILL-00-32CERN-TH-2000-344MCGILL-2000-32oai:cds.cern.ch:4789202000-11-30
spellingShingle Particle Physics - Theory
Antoniadis, Ignatios
Benakli, K.
Laugier, A.
Contact interactions in D-brane models
title Contact interactions in D-brane models
title_full Contact interactions in D-brane models
title_fullStr Contact interactions in D-brane models
title_full_unstemmed Contact interactions in D-brane models
title_short Contact interactions in D-brane models
title_sort contact interactions in d-brane models
topic Particle Physics - Theory
url https://dx.doi.org/10.1088/1126-6708/2001/05/044
http://cds.cern.ch/record/478920
work_keys_str_mv AT antoniadisignatios contactinteractionsindbranemodels
AT benaklik contactinteractionsindbranemodels
AT laugiera contactinteractionsindbranemodels