Contact interactions in D-brane models View Full Text


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Article Info

DATE

2001-05-23

AUTHORS

Ignatios Antoniadis, Karim Benakli, Alexandre Laugier

ABSTRACT

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. More... »

PAGES

044

Identifiers

URI

http://scigraph.springernature.com/pub.10.1088/1126-6708/2001/05/044

DOI

http://dx.doi.org/10.1088/1126-6708/2001/05/044

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1010121657


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