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Muon HLT Efficiency Measurement with the "Reference-Trigger" Method

Developers and contact information

D. Kovalskyi, H. Brun, C. Bernardes (for info:,


Very useful to measure the efficiency of complex trigger paths, such as double-muon and dimuon triggers, combination of triggers, cross-triggers, etc. The description and examples below refer to the specific cases of (combinations of) double-muon trigger paths HLT_Mu17_Mu8, HLT_Mu17_TkMu8, HLT_Mu22_TkMu8.


Choice of the reference trigger

The measurement is based on the computation of the complex trigger paths efficiency for event passing a reference trigger. The reference trigger should be chosen to have a high efficiency on the events passing the complex trigger to not bias the result. For example, HLT_Mu17 is the best candidate for double muon triggers like HLT_Mu17_Mu8, HLT_Mu17_TkMu8, HLT_Mu22_TkMu8.

Reference trigger efficiency

The reference trigger efficiency can be measured using the standard Tag and Probe method as documented here. As the HLT_Mu17 is prescaled, it is needed to request the tag muon be match with HLT_Mu17 to not have the prescale in the efficiency results.


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Topic revision: r2 - 2013-08-22 - HuguesBrun
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