[A1n_d2n] [EXTERNAL] Re: Abstract for APS April meeting

[Korsch, Wolfgang]

Hi Xiaochao,
 I have a few comments. See below:



> The virtual photon asymmetry of the neutron $A_1^n$ is one of the
> fundamental quantities which can provide information about the spin
> structure of the nucleon.
>

Not sure what "one of the fundamental quantities" means in this context.
Maybe something like: " A1n is an important quantity ..." is better?


> Value of $A_1^n$ at high $x_{Bj}$ is of particular interest because
> valence quark dominate in this region, making it a relatively clean region
> to study the nucleon spin structure.
>

Here I would start with "A1n at high xBj is .....  because the
contribution of valence quarks (use plural) dominates this region ...,
allowing for a cleaner interpretation of the results."


> The 6 GeV JLab result on $A_1^n$ showed that the down quark polarization
> is negative up to $x=0.61$,
>

"An earlier result from Jefferson Lab at 6 GeV showed ...  up to x ~ 0.61,
". Not equal (=) . Also either use x_Bj (as above) of x consistently.


> in contrast with pQCD predictions that it must turn positive and
> approaches 1 at $x\to 1$.
>

"... must turn positive" is too strong. Something like ".. it turns
positive and ...." seems better to me.


> In this talk I will report on a recently completed $A_1^n$ measurement
> using JLab 11 GeV beam and an upgraded polarized $^3$He target, that
> provided data up to $x=0.75$.
>

" .... precision A1n measurement using the 11 GeV beam and an upgraded
polarized 3He target at Jefferson Lab, ...."

Best,
 Wolfgang



>
> Thanks in advance.
>
> Xiaochao
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