Difference between revisions of "Observables"
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| − | A<sub>xx</sub> is an asymmetry so take advantage of numerator denominator systematics cancellation: | + | A<sub>xx</sub> is an asymmetry so take advantage of numerator denominator systematics cancellation:<br> |
| + | |||
1.) Measure N<sub>p</sub> and N<sub>u</sub> with same cup same exact material <br> | 1.) Measure N<sub>p</sub> and N<sub>u</sub> with same cup same exact material <br> | ||
2.) Use same B-field <br> | 2.) Use same B-field <br> | ||
Revision as of 10:52, 25 April 2013
A couple of words about Axx and how to measure it:
Axx is an asymmetry so take advantage of numerator denominator systematics cancellation:
1.) Measure Np and Nu with same cup same exact material
2.) Use same B-field
3.) Use NMR on both to measure polarization and un-polarization
4.) Let beam heating an off larmor microwave control un-polarization
5.) Keep both cold (~1K)
6.) Switch from pol to unpol frequently
For unpolarized electron beam:
Which means there is a direct relationship to first component analyzing power
which is very much accessible with e+D->e+N+X
In addition we have a direct relationship to b1 for low x but be weary uncertainties
