Nuclear PDF sets


nNNPDF1.0 is a first determination of the nuclear parton distribution functions (nPDF) based on the NNPDF methodology. This analysis is based on neutral-current deep-inelastic structure function data and is performed up to NNLO in QCD calculations with heavy quark mass effects. For the first time in the NNPDF fits, the χ2 minimization is achieved using stochastic gradient descent with reverse-mode automatic differentiation (backpropagation). The nNNPDF1.0 distributions satisfy the boundary condition whereby the NNPDF3.1 proton PDF central values and uncertainties are reproduced at A = 1, which introduces important constraints particularly for low-A nuclei. We also investigate the information that would be provided by an Electron-Ion Collider (EIC), finding that EIC measurements would significantly constrain the nPDFs at small-x.

Paper: https://arxiv.org/abs/1904.00018

Sets

NLONNLO

nNNPDF10_nlo_as_0118_N1
nNNPDF10_nlo_as_0118_D2
nNNPDF10_nlo_as_0118_He4
nNNPDF10_nlo_as_0118_Li6
nNNPDF10_nlo_as_0118_Be9
nNNPDF10_nlo_as_0118_C12
nNNPDF10_nlo_as_0118_N14
nNNPDF10_nlo_as_0118_Al27
nNNPDF10_nlo_as_0118_Ca40
nNNPDF10_nlo_as_0118_Fe56
nNNPDF10_nlo_as_0118_Cu64
nNNPDF10_nlo_as_0118_Ag108
nNNPDF10_nlo_as_0118_Sn119
nNNPDF10_nlo_as_0118_Xe131
nNNPDF10_nlo_as_0118_Au197
nNNPDF10_nlo_as_0118_Pb208

nNNPDF10_nnlo_as_0118_N1
nNNPDF10_nnlo_as_0118_D2
nNNPDF10_nnlo_as_0118_He4
nNNPDF10_nnlo_as_0118_Li6
nNNPDF10_nnlo_as_0118_Be9
nNNPDF10_nnlo_as_0118_C12
nNNPDF10_nnlo_as_0118_N14
nNNPDF10_nnlo_as_0118_Al27
nNNPDF10_nnlo_as_0118_Ca40
nNNPDF10_nnlo_as_0118_Fe56
nNNPDF10_nnlo_as_0118_Cu64
nNNPDF10_nnlo_as_0118_Ag108
nNNPDF10_nnlo_as_0118_Sn119
nNNPDF10_nnlo_as_0118_Xe131
nNNPDF10_nnlo_as_0118_Au197
nNNPDF10_nnlo_as_0118_Pb208


Additional NLO sets


Fit with EIC pseudo-data (low energy scenario)
Fit with EIC pseudo-data (high energy scenario)
Baseline fit with 1000 replicas
Baseline fit with NNPDF3.0+LHCb as proton boundary condition