Blake,
These results are coming together nicely, thanks to your hard work! I
have a few comments.
- Going from mean-time resolution to single-end time resolution you
multiply by sqrt(2), not divide. This is because the mean-time is
tM=(tS+tN)/2 where you grow by sqrt(2) by summing the two (equivalent)
ends but then divide by 2, so the tM resolution is better than either
end.
- I am surprised that combining the different layers does not give
you much improvement in the resolution. Assuming independence, you
should get approximately a factor 1/sqrt(2) in combining layers 7 and
8. This means they are correlated. Have you taken a look at
tM7-tphoton vs tM8-tphoton to see if the correlation is as strong as
this seems to indicate?
- I find the double negatives "- (-tphoton) confusing. I suggest
that you write "- tTagger" everywhere and avoid the confusion of the
reversed polarity of the tphoton field in the root ntuple.
Have you taken a look at the runs away from normal incidence?
Richard J.
Blake Leverington wrote:
Hi all,
I've posted the preliminary draft of the note on timing resolution for
the BCal to the wiki. You can find it directly here:
http://www.jlab.org/Hall-D/software/wiki/index.php/BCal_Timing_Resolution_Note
I'm going home to sleep now. Send me all your comments or complaints.
-Blake
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