# Determination of neutron fracture functions from a global QCD analysis of leading neutron production at HERA

## TL;DR

This paper performs a global QCD analysis to determine neutron fracture functions from leading neutron production data at HERA, providing a detailed NLO fit and uncertainty estimation that aligns well with experimental results.

## Contribution

It introduces a novel NLO global QCD fit of neutron fracture functions using HERA data, including uncertainty quantification with the Hessian method.

## Key findings

- Neutron fracture functions are successfully extracted from data.
- Predictions agree well with experimental measurements across kinematic ranges.
- Uncertainty estimates are provided for the neutron FFs and related observables.

## Abstract

In this article, we present our global QCD analysis of leading neutron production in deep inelastic scattering at H1 and ZEUS collaborations. The analysis is performed in the framework of a perturbative QCD description for semi-inclusive processes which is based on the fracture functions approach. Modeling the non-perturbative part of the fragmentation process at the input scale Q$_0^2$, we analyze the Q$^2$-dependence of the leading neutron structure functions and obtain the neutron fracture functions (neutron FFs) from next-to-leading order (NLO) global QCD fit to data. We have also performed a careful estimation of the uncertainties using the "Hessian method" for the neutron FFs and corresponding observables originating from experimental errors. The predictions based on the obtained neutron FFs are in good agreement with all data analyzed, at small and large longitudinal momentum fraction $x_L$ as well as the scaled fractional momentum variable $\beta$.