Search for TeV Strings and New Phenomena in Bhabha Scattering at LEP2
arXiv:hep-ph/0002172 · doi:10.1103/PhysRevD.62.076005
Abstract
A combined analysis of the data on Bhabha scattering at centre-of-mass energies 183 and 189 GeV from the LEP experiments ALEPH, L3 and OPAL is performed to search for effects of TeV strings in quantum gravity models with large extra dimensions. No statistically significant deviations from the Standard Model expectations are observed and lower limit on the string scale M_S = 0.631 TeV at 95 % confidence level is derived. The data are used to set lower limits on the scale of contact interactions ranging from 4.2 to 16.2 TeV depending on the model. In a complementary analysis we derive an upper limit on the electron size of 2.8 x 10^{-19} m at 95 % confidence level.
10 pages, 1 table, 3 figures
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- Hint for axial-vector contact interactions in the data on e+e- -> e+e-(gamma) at centre-of-mass energies 192-208 GeV
- Contact interactions in low scale string models with intersecting -branes
- Sensitivity to Contact Interactions and Extra Dimensions in Di-lepton and Di-photon Channels at Future Colliders
- Searching for New Physics using Precision Standard Model Measurements
- New Physics Searches via Beam Normal Spin Asymmetry in Bhabha Scattering