Low-x physics is reviewed, with particular emphasis on searches for deviations from GLAP evolution of the parton densities. Although there are several intriguing indications, both in HERA and Tevatron data, as yet there is no unambiguous evidence for other than standard next-to-leadingorder GLAP evolution. The framework of dipole models and saturation of… CONTINUE READING
Figure 17: The ratio of jet cross sections with rapidity gaps between them measured at √ s = 1800 and 630 GeV by the D0 Collaboration. The data points are plotted as filled circles for rapidity gaps greater than 1, and 2, as a function of the mean rapidity gap at 630 GeV. The light shaded circles represent the predictions from HERWIG while the square represents a calculation based on the LLA BFKL approach. The thick error bars denote the statistical uncertainty, while the thin error bar denotes the statistic and systematic uncertainties added in quadrature.