Data release for the NOvA muon antineutrino charged-current (CC) pi^0 cross section presented in arXiv:2511.05807.

The signal for this analysis is defined as muon antineutrino CC interactions in the fiducial volume of the NOvA near detector (a 2.7 m × 2.7 m × 9.0 m region) that produce at least one pi^0 in the final state emerging from the nucleus, within the phase space of muon momentum [0.5, 2.5) GeV/c and muon angle [0, 60) degree, as described in arXiv:2511.05807. 

The released zip file contains two files:

  NOvA_NumubarCCPi0_DataRelease.root
  README.txt

The ROOT file includes the cross-section results as well as the statistical and systematic covariance matrices for each variable used in this analysis. The README provides a detailed description of the contents of the data release.

Official Flux:

The flux used in this analysis is available from the NOvA Public Docs: https://publicdocs.fnal.gov/cgi-bin/ShowDocument?docid=8.

File structure --- The ROOT file contains the following TDirectories:

  pi0p      - pi^0 momentum distributions
  pi0dir    - pi^0 angular distributions
  muonp     - muon momentum distributions
  muondir   - muon angular distributions
  Q2        - reconstructed Q^2 distributions
  Wmass     - reconstructed W_mass distributions

Each directory contains three histograms:

  xsec (TH1D):      Cross section result
  cov_stat (TH2D):  Statistical covariance matrix
  cov_syst (TH2D):  Systematic covariance matrix

Usage notes:

  - xsec gives the measured differential cross section w.r.t. the corresponding variable.
  - cov_stat and cov_syst provide the full covariance matrices.
  - The bin definitions and kinematic phase spaces follow those used in arXiv:2511.05807.

Citation --- If you use these data, please cite: NOvA Collaboration, arXiv:2511.05807.
