[d2n-analysis-talk] mwdc 4-pass t0

[posik at jlab.org]

Hi all,

 So I adjusted the t0 for each plane in the mwdc. I then checked the
residuals for each plane. Before the calibration the residual sigma for
all planes was between ~600-800 um and now they take on values of
~200-300 um. Some planes are better than others. Below I show a plot of
the v3p planes t0's and residuals before and after the t0 adjustment.

  To get an idea of where we are compared to transversity, I talked to Xin
and for his elastic runs he had a resolution of 180-200 um and for
production run he had 200-250um. So we differ only by ~50um.

I am wondering if it is worth doing the calibration wire by wire for the
t0,wire offsets drift distance to drift time conversion?

-matt
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