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

Year: 2026

Type: article

Abstract: A bstract 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 Λ 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.

Source: Journal of High Energy Physics

DOI: 10.1007/jhep10(2026)089

Authors: Valerio Bertone, Alessia Bongallino, Amedeo Chiefa, Miguel G. Echevarría, Gunar Schnell

Institutions: Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Université Paris-Saclay, CEA Paris-Saclay - Etablissement de Saclay, Institut de Recherche sur les Lois Fondamentales de l'Univers, University of the Basque Country, University of Edinburgh, Ikerbasque

Language: English

Topic: Quantum Chromodynamics and Particle Interactions

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

Funders: European Commission, Agence Nationale de la Recherche, Eusko Jaurlaritza, Ikerbasque, Basque Foundation for Science, Agencia Estatal de Investigación, NextGenerationEU

OpenAlex ID: W7160611724