User name A. Deur
Log entry time 23:58:48 on June14,2001
Entry number 63133
keyword=Elastic asymmetryHere the results of the analysis of elastic asymmetry.
For the right arm, I analyzed almost all the runsw but for the left arm, I analyzed only the first half.
We took elastic data in four configurations:
1st: Beam half wave plate in
2nd: Beam half wave plate out. The sign of the asymmetry should flip
3rd: We rotated the field of the target. The sign of the asymmetry should flip again
4th.Beam half wave plat out. The sign of the asymmetry should flip again.
I also simulated the expected asymmetry, from known elastic form factor. The spectrometer acceptance is folded in as well as radiative correction (this latter as a very small effect).
I took 83% as a beam polarization and 38% as a target polarization. The nitrogen contamination was also accounted for (7% dilution).
In the figures, the first plots is the measured raw asymmetry (blue open circles) and the simulated raw asymmetry (red triangles).
The second plot shows the charge asymmetry.
The last plot is the deadtime asymmetry (actually the livetime). We can see clearly here sign flips for the 4 configurations. This is expected.
The folowing numbers give the expected asymmetry and the weighted average of the measured asymmetry. Errors are only statistic. (I did not analyzed all the stat available)
Left arm
First configuration. Second conf. Third conf. Fourth conf.
1.74% +/- 0.2% -2.0%+/-0.2 not analyzed
Right arm
2.34%+/-0.18 -2.14%+/-0.2 2.11%+/-0.16 -1.80+/-0.17
Expected is 2.30%
FIGURE 1
FIGURE 2
