Towards a combined analysis of inclusive/exclusive electroproduction

Astrid N Hiller Blin,Vitaly V Chesnokov,Victor I Mokeev,R Beck,Y Wunderlich,A Thiel,U Thoma

doi:10.1051/epjconf/202024102001

Abstract

In view of the major advances achieved by the CLAS experiments in studying theN* electroex citation amplitudes, as well as further extension of these studies in the experiments with CLAS12, we present an approach for the evaluation of the resonant contributions to inclusive electron scattering off protons. For the first time, the resonant contributions are determined from the experimental results onN* electrocouplings available from the data analyses of exclusive meson electroproduction off protons. This is a useful benchmark for future endeavours on understanding the transition region between low and high-energy regions, strongly related to tests on quark-hadron duality.

Highlights

Due to their connection to the nucleon parton distribution functions (PDFs), which were recently related to the QCD Lagrangian, and in view of the exploration of the quarkhadron duality [4], the interest in inclusive electron scattering reactions off nucleons has been strong
In the second resonance region, the N(1535) 1/2− gives the largest contribution at Q2 > 2.0 GeV2 due to the slower decrease of its A1/2 electrocoupling with Q2 in comparison with that of N(1520)3/2− [12, 13]
Because of the large total decay width of the N(1440)1/2+ resonance, which amounts to 300 MeV, its complementary contribution is observed in all three resonance regions at W < 1.7 GeV

Summary

Introduction

Due to their connection to the nucleon parton distribution functions (PDFs), which were recently related to the QCD Lagrangian (see Refs. [1,2,3] and references therein for an overview), and in view of the exploration of the quarkhadron duality [4], the interest in inclusive electron scattering reactions off nucleons has been strong. The analyses of CLAS experiments on exclusive meson electroproduction enabled to determine the nucleon resonance N∗ electro-excitation amplitudes in terms of the transverse, A1/2(Q2), A3/2(Q2) and longitudinal, S 1/2(Q2) electrocouplings [12, 13]. This information has become available for most excited nucleon states in the mass range MN∗ < 1.8 GeV and at Q2 < 5.0 GeV2, and substantial evidence of a new baryon state N (1720) 3/2+ has been found recently [14, 15].

Objectives

Results

Conclusion