Polarized lepton nucleon scattering - summary of the experimental spin sessions at DIS 99

TL;DR

This paper summarizes experimental results on polarized lepton-nucleon scattering from DIS 99, including quark and gluon polarization measurements, spin asymmetries, hyperon polarization, and sum rule tests, highlighting recent advances and future prospects.

Contribution

It provides a comprehensive overview of recent experimental findings in polarized lepton-nucleon scattering, including the first direct gluon polarization measurement and various spin asymmetry observations.

Findings

First direct measurement of positive gluon polarization

Observation of double-spin asymmetry in diffractive rho production

Measurement of the Gerasimov-Drell-Hearn sum rule

Abstract

This paper summarizes the contributions to the experimental sessions on polarized lepton nucleon scattering at the DIS 99 workshop. Results are reported about the flavor decomposition of the quark polarization, a first direct measurement of a positive gluon polarization, the observation of a double-spin asymmetry in diffractive rho production, the polarization of lambda hyperons, the observation of transverse single-spin asymmetries and the measurement of the Gerasimov-Drell-Hearn sum rule. Prospects of future fixed target and collider facilities are discussed.