Gluon polarisation from high transverse momentum hadron pairs production (COMPASS)

TL;DR

This paper presents a new measurement of gluon polarization G/G in deep inelastic scattering events with high transverse momentum hadron pairs, using a neural network-based weighting method, based on data from the COMPASS experiment.

Contribution

It introduces a novel neural network-based weighting method for extracting G/G from high transverse momentum hadron pairs in DIS.

Findings

Preliminary G/G results for Q^2>1 (GeV/c)^2

Preliminary G/G results for Q^2<1 (GeV/c)^2

Data collected by COMPASS at CERN (2002-2004)

Abstract

A new preliminary result of a gluon polarisation \Delta G/G obtained selecting high transverse momentum hadron pairs in DIS events with Q^2>1 (GeV/c)^2 is presented. Data has been collected by COMPASS at CERN during the 2002-2004 years. In the extraction of $\Delta G/G$ contributions coming from the leading order $\gamma q$ and QCD processes are taken into account. A new weighting method based on a neural network approach is used. Also a preliminary result of \Delta G/G for events with Q^2<1 (GeV/c)^2 is presented.