[Tdis] [EXTERNAL] Re: Uncertainties

[Jan C. Bernauer]

Follow up:

The 5% for the pionic content is from comparison from Drell-Yan. The 
proposal  says that without that, it can be up to 20%.  For the kaons, 
we don't have this comparison. Can we assume that we tune the pions, and 
then translate that to the kaons? Does this explain the larger error?

Best,

Jan

On 8/16/2020 2:37 PM, Jan C. Bernauer wrote:
> Hi all,
>
> I'm trying to understand the uncertainty budgets in the two proposals.
>
> 1) Looking at the kaon proposal, Fig  14 shows about 8.6% or so error 
> for pions, and about 14% or so for kaons.
>
> For pions, this meshes well with the total systematic error of 8.4%, 
> with the difference from the statistical error. But shouldn't the 
> systematic error for kaons be very similar? The count rates should be 
> 3 times lower, so the statistical error is still small and can't quite 
> explain the difference I think.  Is the uncertainty in the kaon flux 
> higher?
>
> 2) Table 9 (pion)/table 3 (kaon) says 6.5%, which is on the CS. If I 
> add the 5% of the pion flux, I would end up at 8.2%, not 8.4%.
>
> 3) Same table also lists DIS electron cross section as 3% uncertainty. 
> But according to section 1.2, we'll look at the ratio to F_2^p (or 
> F_2^d  or F_2^n), which we measured. So wouldn't this 3% cancel?
>
> Best,
>
> Jan
>
-- 
Dr. Jan C. Bernauer
Assistant Professor
Department of Physics and Astronomy
Stony Brook University
Stony Brook, NY 11794-3800