Predictions for single spin asymmetries in ℓp ↑ → πX and γ ∗ p ↑ → πX
نویسنده
چکیده
Predictions for the single transverse spin asymmetry AN in semi-inclusive DIS processes are given; non negligible values of AN may arise from spin effects in the fragmentation of a polarized quark into a final hadron with a transverse momentum k⊥ with respect to the jet axis, the so-called Collins effect. The elementary single spin asymmetry of the fragmenting quark has been fixed in a previous paper, by fitting data on pp → πX, and the predictions given here are uniquely based on the assumption that the Collins effect is the only cause of the observed single spin asymmetries in pp → πX. Eventual spin and k⊥ dependences in quark distribution functions, the so-called Sivers effect, are also discussed.
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