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.