[b1_ana] Fwd: Systematic Errors

[O. A. Rondon]

Hi,

The table on App. B of PR12-13-001 lists relative point to point errors,
which I assume means errors from kinematics dependent quantities. I
suggest we could split our table 3 to be more precise as follows:

Errors on Azz
Normalization errors (all relative):
Target (and maybe beam) polarization at the P_z and P_zz level
Beam charge
Detector efficiency

Kinematics dependent errors (all relative):
Dilution factor f(x,Q^2)
(p.f. propagates and is absorbed into d.f., but really is just a
normalization)
Radiative corrections
Detector resolution

Time dependent errors (per measurement cycle) (absolute):
Charge calibration drift
Detector efficiency drift

Error on b1
Kinematics dependent errors (relative):
F1d(x,Q^2) <~ 5%

Dustin may have further ideas, and, of course, he has the numbers for
our estimates.

Cheers,

Oscar

Patricia SOLVIGNON wrote:
> Here is the proposal Steve is talking about:
> 
> 
> 
> 
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> 
> 
> Patricia
> 
> -- 
> Patricia SOLVIGNON
> Staff Scientist
> Jefferson Lab
> 
> Current address : 
> Jefferson Lab
> Suite 6, MS. 12H4                               Room C121 (Cebaf Center)
> 12000 Jefferson Avenue                      Office:   (757)-269-6933
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> 
> On May 10, 2013, at 3:21 PM, "O. A. Rondon" <or at virginia.edu 
> <mailto:or at virginia.edu>> wrote:
> 
>> Hi Steve,
>>
>> Which proposal number is this experiment? I've looked at E94-110,
>> 99-118, 02-109, 03-103, 04-001, and 06-009, all about R on deuterium or
>> nuclear targets, and none have an Appendix B on p.29 discussing
>> systematic errors.
>>
>> Or maybe you have a version that is different from those posted below?
>> http://www.jlab.org/div_dept/physics_division/experiments/
>>
>> Thank you and cheers,
>>
>> Oscar
>>
>> Patricia SOLVIGNON wrote:
>>> Begin forwarded message:
>>>
>>>> *From: *"Stephen A. Wood" <saw at jlab.org <mailto:saw at jlab.org>>
>>>> *Subject: **Systematic Errors*
>>>> *Date: *May 10, 2013 1:52:08 PM EDT
>>>> *To: *Patricia Solvignon-Slifer <solvigno at jlab.org <mailto:solvigno at jlab.org>>
>>>>
>>>> Patricia:
>>>>
>>>> I think the table in Appendix B (page 29) of the Nuclear Dependence of R
>>>> proposal might be a good guide of what time dependent/point to point
>>>> systematic errors to consider in b1.  Like b1, measuring R is essentially
>>>> subtracting two cross sections to get a difference that is a small fraction of
>>>> the cross sections.  For b1, ignore the specific numbers presented.  I believe
>>>> the numbers in the table just get copied around between proposals and theses,
>>>> and some of these systematic errors come from the fact that one has to change
>>>> beam energies and spectrometer settings.  But it would be worthwhile to think
>>>> about each item in the list and consider whether it is relevant to b1 and how
>>>> well it can be controlled.
>>>>
>>>> Steve
>>>>
>>>
>>>
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