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Cross section:
Scaling at
, with fixed
:
,
, then
The cross section difference between a target polarized along
and
is
Within the quark-parton model:
Ignoring quark mass effects,
can be decomposed into the sum of two terms:
where
is purely twist-2 and can be expressed in terms of
as follows:
Next: Virtual photon asymmetries
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Xiaochao Zheng
2002-05-09