[Frost] About the condition of the circular polarized data

[Steffen Strauch]

Dear Sung,

I don't know what signature you are looking at in your data.  A "flat", time independent (?), asymmetry signal is a good sign.  I'm not sure about "weirdly" looking asymmetries, though.  For the pi+n channel and using runs with circular polarization I posted experimental asymmetries from my analysis at:

http://www.jlab.org/Hall-B/secure/g9/g9_strauch/mtg/per_run_asymmetries.pdf

The asymmetry is simply the mean observable E where the events where taken in a certain W and cos(theta) bin which was accessible for runs with either of the two electron-beam energies.  For the most part the asymmetry for events from the butanol target is constant throughout the g9a run period and the asymmetry from the carbon target is consistent with zero.  I don't see anything special in periods 4 and 5, expect that the asymmetries in period 4 and 5 are slightly larger than in the other periods.  I think it is interesting to see that the asymmetry within each of the periods is consistent with being constant; chi2/dof is close to 1.  The experimental asymmetry may, however, vary from period to period.  I think this is more related to deviations of the electron beam polarization from the assumed one than uncertainties in the target polarization.

All the best,
Steffen


On Aug 23, 2011, at 2:52 PM, Sungkyun Park wrote:

> Hi all,
> 
> I have found some weird things in some circularly polarized data.
> In circularly polarization, there are seven groups of runs with similar conditions.
> I have defined them as the period.
> 
> 55521 - 55536 : period 1
> 55537 - 55555 : period 2
> 55556 - 55595 : period 3
> 55604 - 55625 : period 4
> 55630 - 55678 : period 5
> 56164 - 56193 : period 6
> 56196 - 56233 : period 7
> 
> The target asymmetries made with period 4 or 5 might be flat and acted weirdly. 
> Are there anyone who had also met the weird situations in period 4 and 5?
> I think conditions of other periods except period 4 and 5 are good in my code.
> I want to know these weird things in period 4 and 5 are from my codes or the data.
> 
> Sung 
> Florida State University
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