Re: 4 (5?) bumps but a definite improvement

["George Lolos" <George.Lolos@uregina.ca>]

Hi Blake:

Well, there's a big improvement already.  However, the spikes you
mentioned - and seen so clearly in the sigma plots - pull the fit to
higher sigma and one can see this that the fit line is consistently
above the valey values between the peaks.    With better statistics and
with the pesky peaks removed, the fit will improve.  However, even as
is, for cell 8 and 1 GeV, we get a sigma of 0.190 ns.  If the sigma of
the timing tagger counters is .160 ns, then the BCAL contribution is
.102 ns, a bit too good to be true but well on the way to acceptability
when all the analysis is done.

George

>>> Blake Leverington <leverinb@uregina.ca> 04/06/07 4:59 PM >>>
Hi David,

I redid similar plots to what you did on April 4th but now using the 
tagger as a reference time( i.e (ts7+tn8)/2 + tphoton ) and things look 
much better. However... :) ...I can clearly see 4 bumps that I am not 
sure where they are coming from. I sort of see gaps in the 
tn8+tphoton:Ephoton spectra as if we're missing the t-counter there or 
something.

You can see the results here:
http://www.jlab.org/Hall-D/software/wiki/index.php/BCal_Beam_Test_Plots%2C_April_6%2C_2007

-Blake