Phys. Rev. D 49, 4493 - 4502 (1994)Twist-4 nuclear parton distributions from photoproduction |
PRL Celebrates 50 Years
This Week's Milestone Letters are from 1981: |
Ma Luo and Jianwei Qiu
Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011
George Sterman
Institute for Theoretical Physics, State University of New York, Stony Brook, New York 11794-3840
Received 23 September 1993
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.
©1994 The American Physical Society
URL: http://link.aps.org/abstract/PRD/v49/p4493
DOI: 10.1103/PhysRevD.49.4493
PACS: 13.87.Ce, 12.38.Bx
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