[PWG] NTPE+ PAC53 result

[efuchey]

Dear all,

That your for your patience on the report of the PAC53 result for our 
nTPE+ experiment. In case you had not seen it this past Friday, I wanted 
to report on the result of the PAC for our experiment. It is available 
in page 11 of the following presentation:

https://indico.jlab.org/event/923/sessions/3345/attachments/13224/21322/Closeout%20PAC53.pdf

To sum up, we got rating C2, which is encouraging. They expect us to 
settle on the question of the uncertainty for radiative corrections 
(which means we have to converge once and for all on the radiative 
corrections analysis for GMn/nTPE, which the GMn/nTPE analysis team 
plans to do soon). They also want to know what is the additional 
systematic uncertainty that we can expect from longer targets (30cm 
instead of 15cm - to optimize luminosity with 1 uA e+ beams). I admit 
this is something I haven't really had much time to tackle, and really 
haven't had the chance to even come up with a method to evaluate that in 
a consistent way.

We will receive the final report within a couple weeks, and they will 
have a more detailed to-do list for us to follow.

Best regards,
Eric