Effects of TMD evolution and partonic flavor on $e^+e^-$ annihilation into hadrons

TL;DR

This paper investigates how TMD evolution and partonic flavor influence the transverse momentum distribution in electron-positron annihilation into hadrons, using recent fragmentation function data and exploring different evolution models.

Contribution

It provides a detailed analysis of TMD evolution effects and flavor dependence in hadron production, comparing various theoretical approaches and nonperturbative parameters.

Findings

Sensitivity of results to different TMD evolution models

Potential for experimental data to distinguish evolution scenarios

Impact of partonic flavor on transverse momentum distributions

Abstract

We calculate the transverse momentum dependence in the production of two back-to-back hadrons in electron-positron annihilations at the medium/large energy scales of BES-III and BELLE experiments. We use the parameters of the transverse-momentum-dependent (TMD) fragmentation functions that were recently extracted from the semi-inclusive deep-inelastic-scattering multiplicities at low energy from HERMES. TMD evolution is applied according to different approaches and using different parameters for the nonperturbative part of the evolution kernel, thus exploring the sensitivity of our results to these different choices and to the flavor dependence of parton fragmentation functions. We discuss how experimental measurements could discriminate among the various scenarios.