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Fermion pair production in e+ e− collisions at 189-209 GeV and constraints on physics beyond the standard model

par Clerbaux, Barbara ; [et al.]
Référence European Physical Journal C. Particles and Fields, 49, 2, page (411-437)
Publication Publié, 2007

Article révisé par les pairs

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Résumé :

Cross sections, angular distributions and forward-backward asymmetries are presented, of two-fermion events produced in e+e- collisions at centre-of-mass energies from 189 to 209 GeV at LEP, measured with the ALEPH detector. Results for e+e-, μ+μ -, τ+τ-, qq̄, bb̄ and cc̄ production are in agreement with the standard model predictions. Constraints are set on scenarios of new physics such as four-fermion contact interactions, leptoquarks, Z′ bosons, TeV-scale quantum gravity and R-parity violating squarks and sneutrinos. © Springer-Verlag Berlin Heidelberg 2007.