Backward Monte-Carlo applied to muon transport

Understand

We discuss a backward Monte-Carlo technique for muon transport problem, with emphasis on its application in muography.

• Backward Monte-Carlo allows exclusive sampling of a final state by reversing the simulation flow.
• In practice it can be made analogous to an adjoint Monte-Carlo, though it is more versatile for muon transport.
• A backward Monte-Carlo was implemented as a dedicated muon transport library: PUMAS.