[G8b_run] Newly cooked data

[Franz Klein]

Mike,
thanks for checking the data. I guess your plot is made from GPID output.
Your plot shows a clear +2nsec stripe, as if a large ST offset was 
chopped into 2nsec intervals.
I looked into SEB plots, and they show clean pion, proton bands, as well 
as +-2nsec, (for sect.5 also +=4nsec) bands at <1% level.
What I recalibrated before this pass: part of SC calibrations (no 
timewalk), EC2SC time offset (based on seb/661s of anahist...hbook, 
s=sector (note: sector 5 doesn't have good EC calibration)), ST2TOF time 
offset (based on seb/71x0).
STR plots (tag/450x) also show offsets at ~0.

I've probably forgotten something ... but what?

On 06/21/2013 01:31 PM, Michael Dugger wrote:
> Hi,
>
> I was looking at some newly cooked data and am getting results for beta
> vs. momentum that look strange.
>
> The plot for the newly cooked data ->
> http://www.jlab.org/Hall-B/secure/g8b/ASU/tmp/NewBetaVsP.gif
>
> A plot of the previous version of cooked data ->
> http://www.jlab.org/Hall-B/secure/g8b/ASU/tmp/OldBetaVsP.gif
>
> The plots are from PERP, 1.5 GeV, run 48483. The new plot only contains
> events from file A01.B02, while the plot of the previous cook has all A01
> files.
>
> The resolution looks much better, but we now have and extra stripe below
> the proton, and the stripe below the pions is crossing the kaons more
> heavily.
>
> Is anyone else seeing this sort of behavior?
>
> Take care,
> Michael
>
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                   Franz J. Klein, Associate Professor
                   CUA, Department of Physics
                   Washington, DC 20064
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