Difference between revisions of "Observables"
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| − | which is very much accessible with e+D->e+N+X <br> | + | which is very much accessible with e+D->e+N+X and e+D->e+X (be weary of background) <br> |
| − | In addition we have a direct relationship to b1 for low x | + | In addition we have a direct relationship to b1 for low x (be weary uncertainties) <br> |
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Revision as of 12:13, 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 the helicity dependent cross sections are:
Where in the deuteron rest frame the spin is quantized in the direction of the virtual photon
This means there is a direct relationship to first component analyzing power
which is very much accessible with e+D->e+N+X and e+D->e+X (be weary of background)
In addition we have a direct relationship to b1 for low x (be weary uncertainties)
