Event Selection Summary

Table 5.3 gives a summary of the various selection steps required to select the final charged current event sample. It is interesting to note that for the Monte Carlo events the by far largest individual reason for loss of acceptance stems from the FLT. This is not a surprise, however, considering that the Monte Carlo events have been generated starting at a very low ${Q^2}$ of . The cut at the FLT corresponds to a cut at about $100\,{{\mbox{\rm GeV}}}^2$ to .

Table 5.3: Acceptance of the different trigger and selection steps. Shown are only numbers for runs for which the detector was in a good state (see section 5.5.2).

Trigger Level	MC	Data	Data	Data
	% accepted	% accepted	% accepted	# remaining
	of total	in this step	of total
Level-1	69.8	100.0	100.0	107560345
Level-2	63.2	2.1	2.1	2283932
Level-3	63.2	3.5		81540
Vertex Req.	62.4	6.4		5288
Spark	62.4	33.5		1770
Beam-Wall	58.0	39.2		693
Cosmic & Halo	58.0	29.4		204
Vertex Cut	50.3	87.7		179
Neutral Current	45.8	51.4		92
Photoproduction	44.7	53.3		49