OPAL at LEP 1.5


LEP 1.5 data taking took place between 31 Oct and 22 Nov 1995, at e+e- centre-of-mass energies between 130 and 140 GeV.

Online event display images of first multihadron at 130 GeV centre-of-mass energy: greyscale r-phi, r-z; colour r-phi, r-z

Online event display pictures of the first OPAL MH with the jet chamber at full operating voltage, at 130 GeV centre-of-mass energy: colour r-phi, r-z

Online event display pictures of a multihadron from the first data taken at 140 GeV centre-of-mass energy: colour r-phi, r-z


Here we show offline displays of some typical events at LEP 1.5. In these pictures, charged tracks are drawn in cyan, clusters of electromagnetic energy in yellow, clusters of hadronic energy in magenta, track segments in the muon detectors in red and energy in the forward calorimeters in green.

Here is a q-qbar event at 130 GeV. However, many events radiatively return to the Z0 peak by emitting a photon. Here are two views of such an event end view and side view.

Here are two examples of gluon emission in non-radiative and radiative events.

Here are examples of a non-radiative muon pair, a radiative muon pair and a radiative tau pair event. The next event is a radiative neutrino pair event, for which the signature is a single energetic photon in the detector.

The next event shows a three photon final state.

Finally we show several examples of four-fermion production, mu-mu-q-qbar, event 1, in which the two muons form a Z0, and events 2 and 3 in which the hadronic system forms a Z0. The muons are highlighted in red. A final 4-fermion event shows e+e-qq production (the electrons in red).


Here you can find plots of some OPAL physics results from the LEP1.5 run.

The OPAL Webweavers 31 Oct 95 22:30, last update 3 Jul 1996.