Extraction Of Delta g/g From Hermes Data On Inclusive Charged Hadrons

TL;DR

This paper reports on the measurement of gluon polarization Delta g/g using double spin asymmetries in inclusive charged hadron production at Hermes, employing Monte Carlo models to extract the gluon contribution at high transverse momentum.

Contribution

It introduces a method to extract the gluon polarization Delta g/g from Hermes data using leading order Monte Carlo simulations and analyzes asymmetries as functions of pT and x.

Findings

Delta g/g values were obtained for pT>1.05 GeV.

Asymmetries are sensitive to the gluon distribution at high pT.

Two different extraction methods were employed.

Abstract

Hermes has measured longitudinal double spin asymmetries as a function of transverse momentum pT using charged inclusive hadrons from electroproduction off a deuterium target. At pT>1 GeV, the asymmetries are sensitive to the spin dependent gluon distribution Delta g. To extract the gluon polarization Delta g/g, information on the background asymmetry and the subprocess kinematics has been obtained from a Leading Order Monte Carlo model. Values for Delta g/g have been calculated both as a function of the measured pT and x, using two different methods, in the region pT>1.05 GeV.