<div dir="ltr"><div dir="ltr">Hi Xiaochao,<div> I have a few comments. See below:</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr"><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">
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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. </div></div></blockquote><div><br></div><div><font style="background-color:rgb(255,255,255)" color="#0000ff">Not sure what "one of the fundamental quantities" means in this context. Maybe something like: " A1n is an important quantity ..." is better?</font></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">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. </div></div></blockquote><div><br></div><div><font color="#0000ff">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."</font></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">The 6 GeV JLab result on $A_1^n$ showed that the down quark polarization is negative up to $x=0.61$, </div></div></blockquote><div><br></div><div><font color="#0000ff">"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.</font></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">in contrast with pQCD predictions that it must turn positive and approaches
1 at $x\to 1$. </div></div></blockquote><div><br></div><div><font color="#0000ff">"... must turn positive" is too strong. Something like ".. it turns positive and ...." seems better to me.</font> </div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">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 $x=0.75$. </div></div></blockquote><div><br></div><div><font color="#0000ff">" .... precision A1n measurement using the 11 GeV beam and an upgraded polarized 3He target at Jefferson Lab, ...."</font></div><div><font color="#0000ff"><br></font></div><div><font color="#000000">Best,</font></div><div><font color="#000000"> Wolfgang</font></div><div><span style="color:rgb(0,0,255)"><br></span></div><div><span style="color:rgb(0,0,255)"> </span></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">
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Thanks in advance.</div>
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Xiaochao<br>
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