Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intrinsic transverse momentum and transverse spin asymmetries   We investigate leading twist transverse momentum dependent origins of
transverse spin asymmetries in hadron-hadron collisions. The chiral-odd T-odd
distribution function with intrinsic transverse momentum dependence, which
would signal an intrinsic handedness of quarks inside a hadron, could account
for single spin asymmetries and at the same time for the large cos(2 phi)
asymmetry in the unpolarized Drell-Yan cross section, which still lacks
understanding. We show explicitly how it would relate unpolarized and polarized
observables measurable with proton-proton collisions at RHIC. It would offer a
new possibility to access the transversity distribution function.

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The categories of this paper are: comp-gas
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The categories of this paper are: nucl-ex
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The categories of this paper are: eess
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The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
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The categories of this paper are: chem-ph
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The categories of this paper are: math
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The categories of this paper are: econ
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The categories of this paper are: patt-sol
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The categories of this paper are: astro-ph
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The categories of this paper are: cs
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The categories of this paper are: funct-an
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The categories of this paper are: alg-geom
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The categories of this paper are: physics
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The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph