NNLO QCD calculation of hadron multiplicities in light-quark jets at lepton colliders

2025/07/17 by Bin Zhou, Jun Gao, Zhou, Bin +1
Physics and Astronomy · #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #High-Energy Particle Collisions Research

paper · pdf · doi:10.48550/arxiv.2507.13185

Abstract

We present the calculation of next-to-next-to-leading-order (NNLO) QCD corrections to hadron multiplicities in light-quark jets at lepton colliders, employing the ``projection-to-Born" (P2B) method implemented in the FMNLO program. Taking the next-to-leading-order result as an example, we rigorously establish the validity of our P2B-based calculation. We then present NNLO predictions for the normalized asymmetry D_K^- between hadron and antihadron production in light-quark jets and compare them with SLD data. We find that a suppression of these SLD measurements relative to NPC23 predictions for D_K^- emerges in the intermediate z_h domain (0.2 \lesssim z_h \lesssim 0.7). We expect that incorporating these SLD data into global QCD fits will enable improved determination of fragmentation functions.

Citations

• NNLOJET: a parton-level event generator for jet cross sections at NNLO QCD accuracy
• Global analysis of fragmentation functions to light neutral hadrons
• Single-inclusive hadron production in electron-positron annihilation at next-to-next-to-next-to-leading order in QCD
• Fragmentation Functions of Charged Hadrons at Next-to-Next-to-Leading Order and Constraints on the Proton Parton Distribution Functions
• Charged hadron fragmentation functions from collider data

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• NNLO predictions with nonlocal subtractions and fiducial power corrections in GENEVA