Add processed events histogram

[AndrewEdmonds11]

Some analyzers need to know the number of processed events in order to calculate efficiencies. One can get this with ntuple->GetEntries() but they may have flags like hasTracks or hasCRV set to true. These flags add conditions that an event must pass before it is written to the EventNtuple and so may not be what the analyzer needs to calculate the efficiency.

In order to mitigate thise, we can add a one-bin histogram counting the total number of events that EventNtupleMaker has seen.

[brownd1978]

Michael Mackenzie has proposed using trigger bits to flag the MC truth based primary selection 'Triggerable'. This would reduce the redundancy of the output datasets and could allow more efficient analysis. EventNtuple will need trigger filtrering to support this. My suggestion is to add a filter based on the TriggerResult to the EventNtuple processing path (it can by default select all bits), as well as branch(es) with trigger bit information.

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On Tue, Nov 11, 2025 at 9:16 AM Andrew Edmonds ***@***.***> wrote: *AndrewEdmonds11* created an issue (Mu2e/EventNtuple#313) <#313> Some analyzers need to know the number of processed events in order to calculate efficiencies. One can get this with ntuple->GetEntries() but they may have flags like hasTracks or hasCRV set to true. These flags add conditions that an event must pass before it is written to the EventNtuple and so may not be what the analyzer needs to calculate the efficiency. In order to mitigate thise, we can add a one-bin histogram counting the total number of events that EventNtupleMaker has seen. — Reply to this email directly, view it on GitHub <#313>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABAH573HNOE4524UB6GNBVD34IKW5AVCNFSM6AAAAACLZN6FSCVHI2DSMVQWIX3LMV43ASLTON2WKOZTGYYTGMJYGE4TCNI> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

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