The process e+e - -> l lbar f fbar where l is a charged or a neutral lepton and f any charged fermion, is analyzed. The study uses the ALEPH data collected at LEP from 1989 to 1993 at centre-of-mass energies between 88 and 95 GeV, corresponding to almost two million hadronic Z decays and to a total integrated luminosity of 79 pb^-1. For all channels, the data agree well with the standard model expectation both in shape and normalization. The indication of an excess in the e+e- ->tau+ tau- f fbar channel, reported by ALEPH in 1991, is not confirmed.
Study of the four-fermion final state at the Z resonance
G. Batignani;CIOCCI, MARIA AGNESE;FERRANTE, ISIDORO;FIDECARO, FRANCESCO;F. Forti;MESSINEO, ALBERTO MARIA;G. Rizzo;TONELLI, GUIDO EMILIO;G. Triggiani;
1995-01-01
Abstract
The process e+e - -> l lbar f fbar where l is a charged or a neutral lepton and f any charged fermion, is analyzed. The study uses the ALEPH data collected at LEP from 1989 to 1993 at centre-of-mass energies between 88 and 95 GeV, corresponding to almost two million hadronic Z decays and to a total integrated luminosity of 79 pb^-1. For all channels, the data agree well with the standard model expectation both in shape and normalization. The indication of an excess in the e+e- ->tau+ tau- f fbar channel, reported by ALEPH in 1991, is not confirmed.File in questo prodotto:
Non ci sono file associati a questo prodotto.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.