DVCS via color dipoles: Nonperturbative effects

TL;DR

This paper investigates Deeply Virtual Compton Scattering (DVCS) using the color dipole model, incorporating nonperturbative effects through the instanton vacuum, successfully describing experimental data at medium-high Q².

Contribution

It introduces a parameter-free calculation of the DVCS amplitude with a photon wave function derived from the instanton vacuum model, highlighting nonperturbative effects.

Findings

Successfully describes H1 data for DVCS amplitude

Reveals Q² dependence sensitivity to phenomenological cross section

Demonstrates the importance of nonperturbative effects in DVCS

Abstract

We study the DVCS amplitude within the color dipole approach. The light-cone wave function of a real photon is evaluated in the instanton vacuum model. Our parameter free calculations are able to describe H1 data, both the absolute values and the $t$-dependences, at medium-high values of $Q^{2}$. The $Q^{2}$ dependence is found to be sensitive to the choice of the phenomenological cross section fitted to DIS data.