Toward NNLL Threshold Resummation for Hadron Pair Production in Hadronic Collisions

TL;DR

This paper advances QCD threshold resummation for hadron pair production in hadronic collisions to NNLL accuracy, reducing scale dependence and improving agreement with experimental data.

Contribution

It introduces a systematic NNLL resummation framework for hadron pair production, incorporating color structure and soft matrices, extending previous NLL results.

Findings

Significant reduction in scale dependence of the cross section

Improved agreement with experimental data using recent fragmentation functions

Framework applicable to other hadronic processes like jet production

Abstract

We investigate QCD threshold resummation effects beyond the next-to-leading logarithmic (NLL) order for the process H1 H2->h1 h2 X at high invariant mass of the produced hadron pair. We take into account the color structure of the underlying partonic hard-scattering cross sections and determine the relevant hard and soft matrices in color space that contribute to the resummed cross section at next-to-next-to-leading logarithmic (NNLL) accuracy. We present numerical results for fixed-target and collider regimes. We find a significant improvement compared to previous results at NLL accuracy. In particular, the scale dependence of the resummed cross section is greatly reduced. Use of the most recent set of fragmentation functions also helps in improving the comparison with the experimental data. Our calculation provides a step towards a systematic NNLL extension of threshold resummation also for other hadronic processes, in particular for jet production.