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arXiv · 2605.05314

First next-to-next-to-leading-order extraction of fragmentation functions for Lambda hyperons

Valerio Bertone·Alessia Bongallino·Amedeo Chiefa·Miguel G. Echevarria·Gunar Schnell
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Abstract

We present MAPFF1.0_Lambda, the first global analysis at next-to-next-to-leading order in perturbative QCD of the collinear unpolarised fragmentation functions of Lambda hyperons. The fit is based on data from single-inclusive electron-positron annihilation, and from both neutral-current and -- for the first time -- charged-current semi-inclusive deep-inelastic scattering. We have adopted a statistical framework based on Monte Carlo sampling and parametrised fragmentation functions in terms of a neural network. The fragmentation function set comprises a total of seven independent parton flavours, allowing for the first independent determination of valence-quark distributions. Our analysis offers new insights into the hadronisation mechanism of strange baryons and establishes a baseline for future phenomenological and experimental investigations.

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Valerio Bertone, Alessia Bongallino, Amedeo Chiefa, Miguel G. Echevarria, Gunar Schnell. 2026-05-06. First next-to-next-to-leading-order extraction of fragmentation functions for Lambda hyperons. https://arxiv.org/abs/2605.05314

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