Steps in the Simulation

NuMI beam simulation

output: neutrino flux

• simulate the secondary particle generation
• WBB/NBB horn/Li-lens optics
• decay of secondaries in flight to produce neutrinos

Neutrino event generator

output: STDHEP(-like) particle list

• perform $\nu$ oscillations
• simulate the various cross-sections (CC, NC, QE, ...)
• fragmentation in the case of Deep Inelastic Scattering.

GEANT - {\tt gminos}

output: hits (true quantities)

• track input particles through defined volumes
• standard physics processes ($\Delta E \over \Delta x$, interactions, etc)
• store important quantities ($\vec{x}$,E,$\vec{p}$,ipart,$\Delta E$) for particles passing through active volumes.

Active detector response

output: ``data''

• convert true quantities into signals that one would see in an actual detector by modelling the response of the individual technologies (LiqScint, LST, RPC).

Event analysis

output: reconstructed events

• from ``digits'' calculate energies and angles
• perform tracking
• event classification (CC, NC, $\nu_e$, etc.)
• calculate $x$, $y$, $E_{\nu}$, ...

Physics analysis

output: physics

• use events to determine $\sin^2{(2\theta)}$, $\Delta m^2$
• other possible analyses (cf. Jorge's request for proposals)

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Online DAQ

output: data

• read out the detector elements
• provide consistency checks, alarms for real-time monitoring

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