Deuteron Photodisintegration in the Quark-Hadron Picture

TL;DR

This paper reports on the first comprehensive measurements of deuteron photodisintegration at GeV energies, providing insights into the transition from nucleonic to quark-gluon descriptions of hadrons.

Contribution

It presents the first complete angular distribution measurements at photon energies 0.5-3 GeV, supporting the quark-gluon string model for deuteron disintegration.

Findings

Persistent forward-backward asymmetry observed.

Data well described by the Quark Gluon String Model.

First complete angular distribution measurement at these energies.

Abstract

The study of the two-body photodisintegration of the deuteron in the few GeV region is the ideal reaction to clarify the transition from the nucleonic degrees of freedom to the QCD picture of hadrons. The CLAS large angle spectrometer of Hall B at Jlab allowed for the first time the complete measurement of the angular distribution of the differential cross section at photon energy between 0.5 and 3 GeV. Preliminary results of the E93-017 experiment from the analysis of the 30% of the total statistic accumulated show persistent forward-backward asymmetry and are well described by the recent calculation of the deuteron photodisintegration cross section derived in the framework of the Quark Gluon String Model.