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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...
Autores principales: | , , |
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Lenguaje: | eng |
Publicado: |
2000
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Acceso en línea: | https://dx.doi.org/10.1088/1126-6708/2001/05/044 http://cds.cern.ch/record/478920 |
_version_ | 1780896781448511488 |
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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. |
id | cern-478920 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2000 |
record_format | invenio |
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 |