Hadronization and Color Transparency

Abstract

In this article we review our work on the production of hadrons in the nuclear environment. We work with a string-breaking model for the initial production of hadrons and with a quantum-kinetic transport model (GiBUU) to describe the final state interactions of the newly formed (pre)hadrons. The latter are determined both by the formation times and by the time-development of the hadronhadron cross section. We first show that only a linear time-dependence is able to describe the available hadronizatin data. We then compare with detailed data from HERMES and JLAB; very good agreement is reached in all reactions studied without any tuning of parameters. We also repeat predictions of spectra for pions and kaons at JLAB@12GeV. We finally explain the absence of CT effects in the recent experiment on proton transparencies in QE events on nuclei. We propose to look instead for CT effects on protons in SIDIS events.

Event Generators for High-Energy Physics Experiments

“…Data from the EMC experiments at CERN and the HERMES experiment at DESY [256] together tested this model under different assumptions for the time dependence of the interaction cross section. The result is that only a linear increase of the interaction cross section of hadrons during the hadronization is compatible with the data [257,258], in full accordance with quantum diffusion models [259,260]. In contrast, the usual prescription of setting the cross section to zero is inconsistent with data.…”