LOST
(events in DC2 runs)
Distribution of Rejected Events
by number of Tracker Clusters
30
25
20
15
10
5
Number of Clusters
3000
2800
2600
2400
2200
2000
1800
1600
1400
1200
1000
800
0
600
Plot suggests we are
cutting at the edge of
the main cluster
distribution…
35
400
Cut is currently set to
reject events with more
than 500 clusters.
# Clusters Rejected Events
Frequency
These events are
rejected after the
Tracker clustering stage
with a cut on the total
number of Tracker
clusters in the event.
# Events Rejected per Run
(a small sampling of the log files)
# Rejected Clusters per Run
Losing some 40 events per
10000 event run.
50
45
35
30
25
20
15
10
5
Run
9
M
or
e
8
7
6
5
4
3
2
1
0
0
# Rejected Events
40
Distribution of Tracker Clusters
(from modified SystemTests – one run)
Current cut
Propose a “safer” cut at 1000
clusters. Will move from the
tail but still eliminate events
with too many (?) clusters
which can be problematic with
cpu time.