Abstract
Using generalized factorization theorems, we calculate the leading single transverse spin asymmetry for high transverse-momentum direct-photon production in pp collisions, in terms of partonic matrix elements. The leading contribution comes from a "twist-3" parton distribution, involving the correlation between quark fields and the gluonic field strength. With simple assumptions for this matrix element, the asymmetry increases with xF, naturally giving effects of 10% or more at large xF.
| Original language | English |
|---|---|
| Pages (from-to) | 2264-2267 |
| Number of pages | 4 |
| Journal | Physical Review Letters |
| Volume | 67 |
| Issue number | 17 |
| DOIs | |
| State | Published - 1991 |
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