[d2n-analysis-talk] Fwd: helium A1, d2

[Brad Sawatzky]

Hi Wally,

Nuclear correction calculations for d2 would be great for 0.5 to 6 GeV^2
(it would be interesting to see the trend), but our central <Q2> at
which we will compute our experimental d2 will be a nominal 3--4 GeV2.
See the attached slides for a few more details.

I believe the quasi-elastic contribution is negligible for our
kinematics and can be safely ignored.

-- Brad

On Thu, 21 Jun 2012, Diana Parno wrote:



> > From: Wally Melnitchouk <wmelnitc at jlab.org>
> > Date: June 21, 2012 12:52:52 PM PDT
> > To: Diana Parno <dparno at uw.edu>
> > Cc: Zein-Eddine Meziani <meziani at temple.edu>, Jacob Ethier <jethier at jlab.org>
> > Subject: helium A1, d2
> >
> > Hi Diana,
> >
> > Can you please remind me what value(s) of Q^2 you need the estimates
> > of nuclear effects in d2(Q^2) at?  We can compute these as a
> > function of Q^2, say from 0.5 to 6 GeV^2, but can also evaluate it
> > at your experimental Q^2.
> >
> > I understand the Q^2 range over which you would like to see the
> > nuclear effects as a function of x are 1 to 6 GeV^2.
> >
> > Also, what do you intend to do with the quasi-elastic contribution
> > to d2(3He)?  Will you be subtracting this from your data before
> > extracting d2(n), and if so, which model for the nuclear corrections
> > will you be using?
> >
> > We are making good progress on the calculations with my summer
> > student, Jacob Ethier, and should hopefully have some results next
> > week.
> >
> > Cheers
> > Wally
> >
> >
> > On Tue, 17 Apr 2012, Diana Parno wrote:
> >
> >> Hi Wally,
> >>
> >> Thanks for your email and the update. I've just gotten back from a  
> >> long and derailing trip to Germany and was thinking of emailing you!
> >>
> >> Yes, your contribution over the next couple of months will still be  
> >> useful for our analysis, though sooner is better. We have made a  
> >> great deal of progress over the last few months on understanding  
> >> our remaining large dataset, although there are still a few more-or- 
> >> less minor questions we need to answer. We are close to formulating  
> >> a correction for the asymmetry in our pion contamination (not  
> >> large, I think). Still remaining are a similar correction for pair- 
> >> produced electrons (as opposed to scattered electrons) in our  
> >> sample; radiative corrections; and a better calculation of our  
> >> target polarization (currently a leading source of systematic error).
> >>
> >> My very rough estimate is that we are now about one and a half to  
> >> two months from having A_1^{3He} with confidence. We are hoping to  
> >> have an in-person collaboration meeting in the next few weeks to  
> >> clarify a plan for getting between point A and point B. I will keep  
> >> you updated. At the very least, I think there are solid grounds for  
> >> hope that we'll be ready experimentally to compute A_1^n by mid- 
> >> July, and then proceed from there to paper-writing.
> >>
> >> Best,
> >> Diana
> >>
> 
-- 
Brad Sawatzky, PhD <brads at jlab.org>  -<>-  Jefferson Lab / Hall C / C111
Ph: 757-269-5947  -<>-  Fax: 757-269-5235  -<>- Pager: brads-page at jlab.org
The most exciting phrase to hear in science, the one that heralds new
  discoveries, is not "Eureka!" but "That's funny..."   -- Isaac Asimov
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