L1Muon::L1MDT Namespace Reference

Compact Segment Finder algorithm overview. More...

Classes
class	CompactSegmentFinderTool
class	IL0MDTSegmentFinderTool
	Interface for the implementation of L1Muon::L1MDT Segment Finder. More...
class	IPtEstimationTool
	Interface for pT estimation tools in the L1Muon MDT chain. More...
class	LegendreSegmentFinderTool
struct	PtEstimate
	Output struct holding the result of a pT estimation. More...
class	PtEstimationTool
class	Segment
	Class describing a reconstructed MDT segment used by the L1Muon trigger. More...

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