Guide to the NuTeV Event Display

The invisible neutrino has entered at the left, interacted with an iron nucleus at the interaction point and produced a muon and a hadronic shower. The hadronic shower and muon are labelled above,

The hadronic shower is detected by scintillation counters in the calorimeter and the muon is momentum analyzed by the iron toroids.

Note: each event display shows two views of the detector: the picture on the top shows a view in the vertical Y direction, the picture on the bottom shows a view of the same event in the horizontal X direction. So while there are two pictures, each event display corresponds to ONE event.

The information along the very top of the display (RUN, EVENT, IGATE and Date) is for book-keeping. The boxed numbers directly below this tell which hardware triggers were satisfied by the interaction.

The Box at the top right lists:

• EMU1 - the reconstructed muon energy (in GeV)
• EHADNC - the reconstructed hadronic energy before correction for muon energy loss (in GeV)
• PLACE - the first counter to fire
• CEXIT - the last counter to fire, CEXIT = 1 if the interaction continues past the end of the calorimeter
• SHEND - the last counter in the hadron shower

The 'X's in the calorimeter show the location of hits in the drift chambers. The drift chambers are what give us position information. There is one drift chamber for every two scintillation counters.

The red lines above the calorimeter show the pulse height in each of the scintillation counters. These pulse heights correspond to the energy deposited by charged particles in each counter. Note: the hadronic shower deposits more energy in the target than the muon. The scintillation counters are numbered from 84 to 1, starting from left to right on the event displays.

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