Hadronic single inclusive kt distributions inside one jet beyond MLLA

TL;DR

This paper improves the theoretical prediction of hadronic transverse momentum distributions inside jets by including higher-order corrections beyond MLLA, achieving better agreement with experimental data and indicating minimal non-perturbative effects.

Contribution

It introduces corrections of order sqrt{alpha_s} to the hadronic kt-spectrum inside jets, extending the MLLA framework beyond the limiting spectrum assumption.

Findings

Enhanced agreement with CDF measurements

Reduced non-perturbative contributions

Improved theoretical accuracy beyond MLLA

Abstract

The hadronic kt-spectrum inside one jet is determined including corrections of relative magnitude sqrt{alpha_s} with respect to the Modified Leading Logarithmic Approximation (MLLA), at and beyond the limiting spectrum (assuming an infrared cut-off Q_0 = Lambda_QCD and Q_0 not = Lambda_QCD). The agreement between our results and preliminary measurements by the CDF collaboration is impressive, much better than at MLLA, pointing out very small overall non-perturbative contributions.