The hit occupancies in the three tracking stations, the number of
full tracks in the muon arm, and the number of full tracks that reach at least
plane 3 of the muon identification system have also been studied for central
HIJET events. A small number of HIJET events, produced with a centrality cut
of the central most 1% impact parameters, were run through the PISA simulation
with a copper nosecone, a BeO nosecone, and no nosecone. Table I. lists the
number of hits per event in stations 1, 2, and 3 with these three
configurations, as well as the number of full tracks from all charged particles
(where a full track is defined to be a particle that hits at least 7 of 9
chambers), the number of full muon tracks, and the number of charged and muon
tracks that also reach at least plane 3 in the muon identification system.
Virtually all of the full muon tracks are 
and K decay muons. As can be seen, the hit
occupancies for a BeO nosecone increase the hit occupancies by 20-30% over a
copper nosecone, and the total number of full tracks in the spectrometer
increases by approximately 20%, but the number is still significantly better
than if no nosecone were present. The number of full muon tracks increases by
about a factor of 1.75. However, if the tracks are required to hit at least
plane 3 of the muon identification system (a requirement for triggering and
off-line analysis), then the total number of charged tracks and the total
number of muons is similar for either a BeO nosecone or a copper nosecone.
Cu Nose
|
BeO
Nose
|
No
Nose
| |
|---|---|---|---|
| St.
1 Hits
|
75
|
91
|
116
|
| St.
2 Hits
|
43
|
57
|
78
|
| St.
3 Hits
|
36
|
44
|
67
|
| #
full Tracks in Tr
|
16
|
22
|
38
|
#
 tracks in Tr
|
1.2
|
2.1
|
3.4
|
| #
full Tracks in Tr and ID
|
0.6
|
0.5
|
0.9
|
| #
Tracks in Tr and ID
|
0.4
|
0.3
|
0.7
|