User name R. Michaels
Log entry time 17:14:55 on July17,2006
Entry number 174349
After plugging in T9, I had to tune some cuts in the HaHelicity
algorithm. Since I know I'll get a lot of questions about helicity,
here are some results: Fig 1 shows how helicity gets loaded at
start of run, so the first few seconds have undefined helicity (in
principle one could back-track and recover these). Fig 2 shows
the helicity for non-T9 events after the predictor algorithm is
loaded (ca 1000 events here). Of course for T9 they are all
helicity==0. For non-T9 there is ~1.5% with helicity==0 due to
the blanking-off period of 500 usec every 30 msec.
The plots are for R-arm but L-arm are similar.