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Adding HLT_xAOD__TrigMissingETContainer_TrigEFMissingET and eProbabilityHT to EXOT9 and EXOT17

Yury Smirnov requested to merge ysmirnov/athena_old:21.2-AddingAContainerAndAVariableIntoExot17-2020-06-16 into 21.2

This MR adds an additional container, the HLT_xAOD__TrigMissingETContainer_TrigEFMissingET, into EXOT9 and EXOT17 derivations, as well as a per-track variable eProbabilityHT from the InDetTrackParticles container.

The first one is needed to get hold of the missing ET seen at the trigger level for the cell-based MET triggers. Container size is 0.67 kb/event in data and 0.65 kb/event in MC. The addition of this container is similar to those I made in MRs !28353 (merged) and !27666 (merged) for pufit- and mht-based MET triggers, respectively.

The eProbabilityHT variable is intended to replace the TRT fHT (high-threshold-hit fraction) signal/bkg discriminator used in the UEH MCP search.

Relative increase in the file size after adding both objects is +3.2% in data and +1.9% in MC. The DAOD_EXOT17.art.pool.root and art_merged.pool.root created with test_data18EXOT17.sh after the development are okay and indeed contain the new objects. The same applies to the tests ran with test_data18EXOT9.sh. Tagging @guescini.

Edited by Yury Smirnov

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