User name X. Zheng
Log entry time 05:48:46 on June14,2001
Entry number 63036
keyword=x=0.6, longitudinal asymmetrySo far there are 5 different ways to correct deadtime for prescale factors, defined as:
#1: no correction, read ps1/ps2/ps3/ps4 from halog_end_[nrun].epics
#2: extract helicity gated accepted triggers from histograms exported by espace, then divided by total triggers read from scalers, give helicity gated "effective PS"s for different event types;
#3: same as #2, but set T2 and T4 to be zero;
#4: read helicity gated total triggers and accepted triggers from scalers, give helicity dependent "effective PS"s, same for different event types;
#5: same as #4, but set T2 and T4 to be zero.
The two plots shown below give raw asymmetries for kinematics x=0.6, transverse (probablly completed) and longitudinal (only complete one day, out of the planned 14 days). They are based on convention #4.
Top: longitudinal; Bottom: transverse.
Also extracted raw asymmetry A1 for 3He as:
0.0572844 err 0.0499697, (percentage, beam & target polarization,dilution are all not included)
FIGURE 1
FIGURE 2
