User name R. Michaels
Log entry time 14:52:54 on September 28, 2006
Entry number 185715
Followups:
keyword=Helicity check du jourI was asked to check helicity for some runs like 5271, see fig 1.
The helicity looks fine, and about 1.6% of the events have helicity==0,
as expected. One has to remember to analyze all the T9, and to reject
them in the display (T9 has helicity==0). The helicity is unknown
in the first 2.88 sec (8000 events here), though this could be recovered
with a "post-diction" based on events after 8000.
There were 2 errors in 200K events about the prediction not agreeing
with the measurement, and about 12 warnings (not errors) about "wierd
time differences" which is a non-fatal advisement about the clock
readings. Overall, par for the course.
A copy of this log entry has been emailed to: gron@jlab.org,jiang@jlab.org
Figure 1
