We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK


93% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Fermion pair production in e+e- collisions at 1...
View graph of relations

Text available via DOI:

« Back

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

Research output: Contribution to journalJournal article


Journal publication date2007
JournalEuropean Physical Journal C: Particles and Fields
Number of pages27
Original languageEnglish


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.