Four-fermion production in e+e− collisions at centre-of-mass energies of 130 and 136 GeV

Abstract Four-fermion events have been selected in a data sample of 5.8 pb −1 collected with the aleph detector at centre-of-mass energies of 130 and 136 GeV. The final states l + l − q q , l + l − l + l − , ν ν q q , and ν ν l + l − have been examined. Five events are observed in the data, in agreement with the Standard Model predictions of 6.67±0.38 events from four-fermion processes and 0.14 −0.05 +0.19 from background processes.