  Charged-current neutrino interactions with final states containing zero
mesons and at least one proton are of high interest for current and future
accelerator-based neutrino oscillation experiments. Using the Booster Neutrino
Beam and the MicroBooNE detector at Fermi National Accelerator Laboratory, we
have obtained the first double-differential cross section measurements of this
channel for muon neutrino scattering on an argon target with a proton momentum
threshold of 0.25 GeV/c. We also report a flux-averaged total cross section of
$\sigma = (11.8 \pm 1.2) \times 10^{-38}$ cm$^2$ / Ar and several
single-differential measurements which extend and improve upon previous
results. Statistical and systematic uncertainties are quantified with a full
treatment of correlations across 359 kinematic bins, including correlations
between distributions describing different observables. The resulting data set
provides the most detailed information obtained to date for testing models of
mesonless neutrino-argon scattering.
