The Muon Ionization Cooling Experiment (MICE) is under development at
the Rutherford Appleton Laboratory (UK). The experiment's goal is to
demonstrate ionization cooling, using a section of cooling
channel. The final step of the experiment will be able to measure a
10% reduction in the emittance (transverse size) of a muon beam, with
a relative precision of 1%.

The emittance measurement will rely on inputs from scintillating fibre
trackers, time-of-flight counters, transition Cherenkov detectors and
the Electron-Muon Ranger, a fully active tracker-calorimeter at the
downstream end. These detectors will together provide position,
momentum and timing measurements of particles upstream and downstream
of the experiment together with identification of particle species.

The global reconstruction software, a part of the MICE Analysis User
Software (MAUS), will combine the measurements from individual
detectors into a set of complete particle hypotheses. Each 1 ms beam
spill is reconstructed in parallel; a spill is divided into individual
particle triggers and passed through a series of algorithms; track
reconstruction and fitting, combined particle identification, and
tagging and rejection of in-flight decays. The triggers are then
recombined, and a collection of particle hypotheses are passed to the
emittance analysis.

We will discuss in detail the components of the global reconstruction,
including:

* Particle track matching through the quadrupole, solenoidal and
  time-varying RF fields of the beam optics.

* Particle identification, using a combination of detector
  technologies and measurements.

* The identification of in-flight particle decays, single hard
  multiple-scatters or multiple particles per trigger; each of which
  would invalidate MICE's 'single muon' analysis strategy.