Large Rapidity Gap Events in Deep Inelastic Scattering

TL;DR

Problem: understanding large rapidity gap events and the Pomeron in DIS. Approach: a color-dipole description using lightcone wave functions for quarks and gluons in the photon, coupled to the proton via kt-factorization and a two-gluon Pomeron; combined with an unintegrated gluon distribution fitted to F2 data. Contributions: new gluon-dipole wave function, explicit diffractive cross-section formulas, and a scale-dependent Pomeron intercept leading to beta, x_IP, and Q^2 dependent diffractive structure functions F2^D. Significance: provides a unified perturbative framework linking inclusive and diffractive DIS, with consistency to Feynman-diagram results and potential for NLO/diffractive-jet extensions.

Abstract

Large Rapidity Gap Events in Deep Inelastic Scattering are discussed in terms of lightcone wave functions for quarks and gluons inside the photon. It is shown that this approach is consistent with earlier, conventional Feynman diagram calculations. An updated parametrization for the cross section is given and a numerical analysis presented.

Figures (6)

• Figure 1: Quark dipole (a) and gluon dipole (b)
• Figure 2: Inclusive Deep Inelastic Scattering ($F_2$).
• Figure 3: Wave functions with shifted argument.
• Figure 4: $\beta$-spectrum.
• Figure 5: $x_{I\!\!P}$-distribution.