Fermion pair production in e + e - collisions at 189–209 GeV and constraints on physics beyond the standard model
European Physical Journal C(2006)
摘要
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.
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关键词
Systematic Uncertainty,Standard Model Prediction,Aleph Collaboration,Hadronic Cross Section,Tematic Uncertainty
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