  Precise measurement of neutrino-nucleus interactions with an accelerator
neutrino beam is highly important for current and future neutrino oscillation
experiments. To measure muon-neutrino charged-current interactions with
nuclear-emulsion-based hybrid detector, muon track matching among the detectors
are essential. We describe the design and performance of a newly developed
scintillation tracker for the muon track matching in the neutrino-nucleus
interaction measurement with nuclear emulsion detectors. The muon tracks are
reconstructed using the scintillation tracker and another detector called Baby
MIND, then, they are matched with the tracks in nuclear emulsion detectors.
  The scintillation tracker consists of four layers of horizontally and
vertically aligned scintillator bars, covering an area of $1\,\mathrm{m} \times
1\,\mathrm{m}$. In the layer, 24 mm-wide plastic scintillator bars are
specially arranged with deliberate gaps between each other. By recognizing the
hit pattern of the four layers, a precise positional resolution of 2.5 mm is
achieved while keeping the number of readout channels as small as 256. The
efficiency of the track matching is evaluated to be more than 97% for
forward-going muons, and the positional and angular resolutions of the
scintillation tracker are 2.5 mm and 20-40 mrad respectively. The results
demonstrate the usefulness of the design of the scintillation tracker for the
muon track matching in the nuclear-emulsion-based neutrino-nucleus interaction
measurements.
