TWIST-4 NUCLEAR PARTON DISTRIBUTIONS FROM PHOTOPRODUCTION

被引：90

作者：

LUO, M ^{[1
]}

QIU, JW ^{[1
]}

STERMAN, G ^{[1
]}

机构：

[1] SUNY STONY BROOK,INST THEORET PHYS,STONY BROOK,NY 11794

来源：

PHYSICAL REVIEW D | 1994年 / 49卷 / 09期

关键词：

D O I：

10.1103/PhysRevD.49.4493

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

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页码：4493 / 4502

页数：10

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