Abstract
We analyze anomalous nuclear enhancement in the photoproduction of jets as a higher-twist process in perturbative QCD. We use the Fermilab E683 data on dijet momentum imbalance to estimate the size of the relevant twist-4 parton distributions. We find that twist-4 matrix elements are of the order of 0.05-0.1 GeV2 times typical twist-2 parton distributions. We discuss a physical interpretation of the nuclear enhancement as a measure of the average net transverse color force on an off-shell parton moving through nuclear matter, and give an order-of-magnitude estimate for the typical squared transverse field strengths encountered by a fast moving parton.
| Original language | English |
|---|---|
| Pages (from-to) | 4493-4502 |
| Number of pages | 10 |
| Journal | Physical Review D |
| Volume | 49 |
| Issue number | 9 |
| DOIs | |
| State | Published - 1994 |
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