Contact interactions in D-brane models

Details Contact interactions in D-brane models Contact interactions in D-brane models

2000-11-30

arxiv.org/abs/hep-th/0011281v2

JHEP 0105:044,2001

Physics

High Energy Physics

High Energy Physics - Theory

27 pages, 1 eps figure, uses JHEP.cls. One reference added. Use of low energy precision electroweak data increased the bounds

Scientific paper

10.1088/1126-6708/2001/05/044

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.

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