L0MDT Namespace Reference

Compact Segment Finder algorithm overview. More...

Classes
class	IL0MDTSegmentFinderTool
	Interface for the implementation of L0MDT Segment Finder. More...
struct	PtEstimate
	Output struct holding the result of a pT estimation. More...
class	IPtEstimationTool
	Interface for pT estimation tools in the L0Muon MDT chain. More...
class	Segment
	Class describing a reconstructed MDT segment used by the L0Muon trigger. More...
class	CompactSegmentFinderTool
class	LegendreSegmentFinderTool
class	PtEstimationTool

Detailed Description

Compact Segment Finder algorithm overview.

This tool reconstructs an MDT segment in the global (z, R) plane starting from a seed line provided by RPC information:

R = m * z + b

Main steps:

1. Build per-hit information from the input MDT drift circles:
   • transform local hit positions to global coordinates
   • compute the drift radius
   • compute the two possible temporary intercepts b+ and b- corresponding to the left/right ambiguity of the drift tube
2. Split hits by multilayer and cluster them independently:
   • each hit can be associated to an existing cluster using either b+ or b- if it is close enough to the cluster reference intercept
   • if no compatible cluster exists, create two new clusters seeded by b+ and b-
3. For each multilayer, select the best cluster:
   • first maximize the number of associated hits
   • then, in case of ties, choose the cluster closest to the RPC seed intercept rpcB
4. Resolve the left/right ambiguity for the hits belonging to the selected clusters and build corrected track points in the (z, R) plane
5. Fit the corrected points with a straight line: R = m * z + b and compute a simple chi2-like quality quantity