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2017 ; 77
(8
): 516
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A determination of the fragmentation functions of pions, kaons, and protons with
faithful uncertainties: The NNPDF Collaboration
#MMPMID28943800
Bertone V
; Carrazza S
; Hartland NP
; Nocera ER
; Rojo J
Eur Phys J C Part Fields
2017[]; 77
(8
): 516
PMID28943800
show ga
We present NNFF1.0, a new determination of the fragmentation functions (FFs) of
charged pions, charged kaons, and protons/antiprotons from an analysis of
single-inclusive hadron production data in electron-positron annihilation. This
determination, performed at leading, next-to-leading, and next-to-next-to-leading
order in perturbative QCD, is based on the NNPDF methodology, a fitting framework
designed to provide a statistically sound representation of FF uncertainties and
to minimise any procedural bias. We discuss novel aspects of the methodology used
in this analysis, namely an optimised parametrisation of FFs and a more efficient
[Formula: see text] minimisation strategy, and validate the FF fitting procedure
by means of closure tests. We then present the NNFF1.0 sets, and discuss their
fit quality, their perturbative convergence, and their stability upon variations
of the kinematic cuts and the fitted dataset. We find that the systematic
inclusion of higher-order QCD corrections significantly improves the description
of the data, especially in the small-z region. We compare the NNFF1.0 sets to
other recent sets of FFs, finding in general a reasonable agreement, but also
important differences. Together with existing sets of unpolarised and polarised
parton distribution functions (PDFs), FFs and PDFs are now available from a
common fitting framework for the first time.