[Halld-offline] [EXTERNAL] proposal for simulation tags connundrum

[Richard Jones]

Hello all,

A conundrum has emerged in the way that tags are handled in reconstructed
simulation events. I was first made aware of this by Igal (see HDGeant4
issue #182 <https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_JeffersonLab_HDGeant4_issues_182&d=DwIBaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=Te_hCR4EUlJ6iCDYLJ8Viv2aDOR7D9ZZMoBAvf2H0M4&m=ZqICas_m3EmL6KSRnz51fGKuy-LC6-t6WtrxIv02BC8&s=8JLlbhYexgPHypPYD9EGu3GpgR_ETaAe-b1UdMkOgyA&e= >) but then
last week it came up again during a discussion of apparent jumps in the
reconstruction efficiency for a physics process at the TAGM/TAGH
boundaries. Today at the HDGeant4 meeting (starts at 3:00) I will review
what I have learned about the cause for this conundrum which lies in a
quirk of how tags are generated in HDGeant4, and propose a solution.

This has potential impact across all ongoing analyses.

Please attend the HDGeant4 meeting today and take part in the discussion if
it matters to you how this is resolved. If not, you can just wait for the
2-minute summary report I will make on this at the next Biweekly Meeting.

-Richard Jones
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