Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin asymmetries at RHIC and polarized parton distributions   We discuss polarized parton distributions and their effects on spin
asymmetries at RHIC. In particular, transversity distributions and transverse
spin asymmetry are studied. First, we show the $Q^2$ evolution difference
between a transversity distribution and a corresponding longitudinally
polarized distribution. The difference could be an important test of
perturbative QCD in high-energy spin physics. Then, the transverse spin
asymmetry $A_{TT}$ is calculated with possible transversity distributions.
Next, we study antiquark flavor asymmetry $\Delta_{_T} \bar u/ \Delta_{_T} \bar
d$ in the transversity distributions by using a simple model. Its effects on
the transverse spin asymmetry are also discussed.

21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn