Bounds on Four-Fermion Contact Interactions Induced by String Resonances

Details Bounds on Four-Fermion Contact Interactions Induced by String Resonances Bounds on Four-Fermion Contact Interactions Induced by String Resonances

2003-09-11

arxiv.org/abs/hep-ph/0309132v2

Phys.Rev. D69 (2004) 095001

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 1 ps figure, version to appear in PRD

Scientific paper

10.1103/PhysRevD.69.095001

Based on tree-level open-string scattering amplitudes in the low string-scale scenario, we derive the massless fermion scattering amplitudes. The amplitudes are required to reproduce those of the Standard Model at tree level in the low energy limit. We then obtain four-fermion contact interactions by expanding in inverse powers of the string scale and explore the constraints on the string scale from low energy data. The Chan-Paton factors and the string scale are treated as free parameters. We find that data from the neutral and charged current processes at HERA, Drell-Yan process at the Tevatron, and from LEP-II put lower bounds on the string scale M_S >= 0.9-1.3 TeV for typical values of the Chan-Paton factors, which are comparable to Tevatron bounds on Z' and W' masses.

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