Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-04-02
Nucl.Phys.B752:1-17,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages in LaTex. Some discussions added. To appear in Nucl. Phys. B
Scientific paper
10.1016/j.nuclphysb.2006.05.036
We study the single spin asymmetry (SSA) for the pion production with large transverse momentum p_T in semi-inclusive deep inelastic scattering $ep^\uparrow\to e\pi X$. We derive the twist-3 cross section formula for SSA, focussing on the soft-gluon-pole contributions associated with the twist-3 distribution for the nucleon and with the twist-3 fragmentation function for the pion. We present a simple estimate of the asymmetries due to each twist-3 effect from nucleon and pion, respectively, by fixing the overall strength of the relevant nonperturbative quantities by the data on the SSA A_N in $p^\uparrow p\to\pi X$ collision.
Eguchi Hisato
Koike Yuji
Tanaka Kazuhiro
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