[A1n_d2n] Abstract for APS April meeting

[Xiaochao Zheng]

Dear All:

I have been invited to give a talk at the APS April meeting, session "Nucleon Structure at Large x", and today is the deadline for submitting abstracts.  I drafted a short one below, please comment before 4pm if possible:

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.  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.  The 6 GeV JLab result on $A_1^n$ showed that the down quark polarization is negative up to $x=0.61$, in contrast with pQCD predictions that it must turn positive and approaches 1 at $x\to 1$.  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 $x=0.75$.

Thanks in advance.

Xiaochao
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