QCD predictions for polarised deep inelastic scattering accompanied by a forward jet in the low x region of possible HERA measurements

TL;DR

This paper predicts the cross-section and asymmetry for forward jet production in polarized deep inelastic scattering at small x, using double ln^2(1/x) resummation, relevant for future HERA measurements.

Contribution

It introduces a resummation approach for polarized DIS at small x and estimates measurable cross-sections and asymmetries for potential HERA experiments.

Findings

Resummation significantly increases predicted cross-section and asymmetry.

Asymmetry varies between -0.01 and -0.04 in the small x region.

Predictions are aligned with HERA kinematic cuts.

Abstract

We estimate the cross-section and asymmetry relevant for the production of forward jets in polarised deep inelastic scattering in the region of small values of $x$ which can be probed at possible polarised HERA measurements. The kinematical cuts implemented in our analysis are the same as those which were used in the unpolarised deep inelastic scattering at HERA. The calculations are based on the double ln^2(1/x) resummation which controls the polarised deep inelastic scattering for small values of the Bjorken parameter x. We show that this resummation substantially enhances the corresponding cross-section and asymmetry. The predicted value of the asymmetry is found to vary between -0.01 and -0.04 within the small x region which can possibly be probed at polarised HERA measurements.