ZDC Polarimetry in p+p 200 GeV runs
Submitted by ogrebeny on Tue, 2009-06-02 22:58
1. Standard triggers zdc_smd_east and zdc_smd_west
Fill 10850
| Run | Number of events (M) | Comment |
| 10153122 | 1.0 | |
| 10153123 | 2.0 | |
| 10153126 | 1.7 | |
| 10156127 | 1.3 | |
| 10156129 | 0.8 | (a) |
| 10156130 | 1.0 | |
| 10154001 | 1.0 | |
| 10154002 | 1.0 | |
| 10154003 | 0.7 | |
| 10154004 | 0.1 | |
| Total | 10.7 |
| Yellow | Blue | |
| Asymmetry εphys (%) | 2.27 ± 0.11 | 2.44 ± 0.08 |
|
Polarization P (%) |
60.5 ± 0.8 | 62.6 ± 1.0 |
| Analyzing power AN (%) | 3.76 ± 0.19 | 3.90 ± 0.14 |
Fill 10851
| Run | Number of events (M) | Comment |
| 10154009 | 1.0 | |
| 10154010 | 1.4 | |
| 10154011 | 1.4 | |
| 10154012 | 1.4 | |
| Total | 5.2 |
| Yellow | Blue | |
| Asymmetry εphys (%) | 2.03 ± 0.15 | 2.34 ± 0.11 |
|
Polarization P (%) |
54.4 ± 1.3 | 62.4 ± 1.2 |
| Analyzing power AN (%) | 3.74 ± 0.29 | 3.74 ± 0.20 |
http://online.star.bnl.gov/zdc/
2. Simulation of 2004 triggers: ZDC_SUM_East and ZDC_SUM_West
Fill 10850
| Run | Number of events (M) | Comment |
| 10153124 | 1.0 | |
| 10153125 | 3.0 | |
| 10153128 | 2.0 | (a) |
| Total | 6.0 |
| Yellow | Blue | |
| Asymmetry εphys (%) | 2.25 ± 0.13 | 2.61 ± 0.11 |
|
Polarization P (%) |
61.3 ± 2.4 | 64.6 ± 2.5 |
| Analyzing power AN (%) | 3.67 ± 0.25 | 4.04 ± 0.24 |
http://online.star.bnl.gov/test/ogrebeny/zdc2009_2004/
(a) Runs were taken after we prepared to dump and accelerator people started playing with the beam. The background ratios mostly stayed under 20%. upVPD high voltage was off.
3. ZDC vs BBC comparison
Source attached.
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