DELPHI Z0 PEAK EVENT

DELPHI Event r0046448e0000596


e+ e- ---> Tau+ Tau- , e vs Mu
Clear Tau+ Tau- candidate, where the Tau+ decays into (e+ Nu) and the Tau- into (Mu- Nubar).

The positron momentum is measured to be 37.1 GeV/c in the tracking chambers and has an associated energy in the HPC of 30.0 GeV. It has no (or little) energy deposited in the HAB and is a clearly identified positron.

The Mu- has a 25.4 GeV/c momentum. It is not observed in the HPC and is minimum ionizing in the HAB. It has associated hits in both planes of the barrel muon chambers. It is a clear muon.

There is about 30 GeV energy missing in the event, which is carried away by the neutrinos.