[Halla_pi0] Message from Khem

[Bryan Moffit]

Bryan could you pass this out, thanks.

I'm sick, I don't think I have time to prepare for the meeting even if I
could make it.

here is what I have.
- replay is done for almost all production run, only some run still have
problems.
13 runs have total number of event not match those in mysql db, the table
that have charge info(13 include runs that doesn't have this info).
- I got tracking efficiency for all those production runs, but haven't plot
out yet, will show with the plot of average hit per plane per event.
-one test Cole asked me to do is put in 2 fake tracks per event, the outcome
is quite bad less than 10% found 2 track, but it's what I expected cause I
changed the code so that it will stop changing resolution when it find
track.

- I check L.tr.vz, and I think the width form peak to peak,  vary quite a
lot.
http://www.jlab.org/~khem/temp/vz.gif
x-axis is runnumber, y-axis is width in meter.

- I'm trying to get x-section by binning the data
  Q2=0.03-0.18   10MeV bin
W=1.072-1.097  1MeV bin
pi0_th 9 bin
pi0_ph 360 bin (main histogram)

the cut is
1cm away from target end cap
missing mass +-10 MeV
time of flight +- 5

now writing script to fit multipoles.

I will need bigbite acceptance in function of pi0 theta and phi as input.
Vladimir could you help me with this , thanks.

Could any one point me out which book I should read about error?

Thank you,
Khem


-- 
-------------------------------------------------------------------------------
		 Bryan Moffit
	  email: moffit at jlab.org
        web page: http://www.jlab.org/~moffit
  random fortune:

It is not every question that deserves an answer.
		-- Publilius Syrus
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