Extraction of Polarized Gluon Distributions from Large-pt Light Hadron Pair Production

Details Extraction of Polarized Gluon Distributions from Large-pt Light Hadron Pair Production Extraction of Polarized Gluon Distributions from Large-pt Light Hadron Pair Production

2001-08-03

arxiv.org/abs/hep-ph/0108027v1

Phys.Lett. B520 (2001) 99-107

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages 3 EPS figures Latex

Scientific paper

10.1016/S0370-2693(01)01122-4

We propose a new formula for extracting the polarized gluon distribution from the large-$p_T$ light hadron pair production for semi-inclusive processes in polarized deep inelastic scattering. In general, a large-$p_T$ hadron pair is produced via photon-gluon fusion(PGF) and QCD Compton at the lowest order of QCD. The PGF gives us a direct information on $\Delta g$ in the nucleon, while QCD Compton becomes background to the signal process for extracting $\Delta g$. We show that the contribution from this background, i.e. the QCD Compton process, can be removed by using symmetry relation among fragmentation functions and taking an appropriate combination of various light hadron pair production processes, and thus the double spin asymmetry can be described in terms of $\Delta g/g$ alone.

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