L2 multi-track SA

A new function of HLTMuon, L2 multi-tarck SA is developed to recover inefficiency against close-by muon events at L2 level. It is new L2MuonSA that can reconstruct multiple muons from a single RoI. The performance of L2 multi-track SA is discussed in ATR-22537 . I confirmed the new function works as expected; dimuon trigger efficiencies for close-by muons are improved, and there are few events that L2 multi-track SA misreconstructed more than two candidates in spite of single muon passed through in a RoI.

L2 multi-track SA can be called when muon trigger chains contains “l2mt” in these names (mt represents “m”ulti-“t”rack SA) . It does not affect the other chains, nor add any variables into existing xAOD HLTMuon objects. It creates new dedicated containers of xAOD HLTMuon objects. When no “l2mt” chain in menu, empty containers are created.

This MR includes adding a test chain “HLT_2mu10_l2mt_L1MU10” in LS2_v1.py in order to validate L2 multi-track SA . The thresholds will be adjusted later and L1_MU10 is tentatively used instead of a proper L1 item with RPC isMoreCand flag (discussed in JIRA ticket above and ATR-22243 ).

@nakahama , @cdiez , @sshaw , @yoyamagu , @yuji

added 48 commits

• 85b35c8c...51031bb2 - 47 commits from branch atlas:master
• 90d914fd - Merge branch 'master' into 'dev_multi-trackSA'

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WARNING: big files (>100K) are found in the changeset

104K in file Trigger/TrigAlgorithms/TrigL2MuonSA/src/MuFastSteering.cxx

This merge request affects 6 packages:

• Trigger/TrigAlgorithms/TrigL2MuonSA
• Trigger/TrigHypothesis/TrigMuonHypoMT
• Trigger/TrigValidation/TrigAnalysisTest
• Trigger/TrigValidation/TriggerTest
• Trigger/TriggerCommon/TrigEDMConfig
• Trigger/TriggerCommon/TriggerMenuMT

Affected files list will not be printed in this case

Adding @sutt ,@ademaria ,@vmartin ,@okumura ,@carquin ,@dzanzi ,@bernius ,@hrussell ,@okuprash ,@malconad as watchers

added Trigger TriggerEDM TriggerMenu changes-trigger-counts master review-pending-level-1 labels

CI Result SUCCESS (hash 90d914fd)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 28523]