Small x: two pomerons!

被引：252

作者：

Donnachie, A ^{[1
]}

Landshoff, PV

机构：

[1] Univ Manchester, Dept Phys & Astron, Manchester M13 9PL, Lancs, England

[2] Univ Cambridge, Dept Appl Math & Theoret Phys, Cambridge CB3 9EW, England

来源：

PHYSICS LETTERS B | 1998年 / 437卷 / 3-4期

关键词：

D O I：

10.1016/S0370-2693(98)00899-5

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Regge theory provides a very simple and economical description of data for (i) the proton structure function with x < 0.7 and all available Q(2) values, (ii) the charm structure function, and (iii) gamma p --> J/psi p. The data are all in agreement with the assumption that there is a second pomeron, with intercept about 1.4. They suggest also that the contribution from the soft pomeron is higher twist. This means that there is an urgent need to make perturbative evolution compatible with Regge theory at small and not-so-small x, and to reassess the magnitude of higher-twist contributions at quite small x. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：408 / 416

页数：9

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