TrigHypoCommonTools: Update MT calculation

Hello,

This is a resubmission of !54456 (closed) with an updated reference file, to maximise our chances to have this merged in time for the MC21a release (22.0.72) expected imminently. The changes are otherwise the same as in the original MR from @bcarlson .

Pasting the original description for completeness:

The transverse mass calculation used was updated to reflect common practice at hadron colliders. In the previous iteration, the mass calculation used is not common at hadron colliders, as it does not give a peak at the parent particle mass. The updated version reflects the recommendation of PDG 49.6, and is relevant for decays such as W->e,nu (or H->yyd) where part of the decay is invisible. The common expression is:

sqrt(2pt1pt2*(1-cos(dphi)).

This update is now reflected in the hypo calculation.

ATR-21565 ATR-24946

Cheers, Bertrand

added urgent label

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

296K in file Trigger/TrigValidation/TrigAnalysisTest/share/ref_RDOtoRDOTrig_v1Dev_build.ref

This merge request affects 2 packages:

• Trigger/TrigHypothesis/TrigHypoCommonTools
• Trigger/TrigValidation/TrigAnalysisTest

Affected files list will not be printed in this case

Adding @vmartin ,@okumura as watchers

added 22.0 Trigger changes-trigger-counts review-pending-level-1 labels

Thanks for updating the references file. I was working on it... but it's better to have it in. I'll move on to other things. Thanks again!

Ben

resolved all threads

resolved all threads

Also tagging @coccaro . As it's changing the counts, it would be great to merge this with higher priority, should the CI turn green... Thanks!

The system determined that CI tests (with names matching "^CITest_SimulationRun(2|3)FullSim.*$") are not needed for this code change. They are not run. This is not an indicator to restart the job.

CI Result SUCCESS (hash 8b034047)

	Athena	DetCommon
externals
cmake
make
required tests
optional tests

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DetCommon: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 54870]

added review-approved-tier0 label

lgtm approving -- L1

added review-approved label and removed review-pending-level-1 label

added review-approved-point1 label

merged

mentioned in commit a4b0c620

mentioned in merge request !54593 (merged)

mentioned in merge request !54456 (closed)

mentioned in merge request !54591 (closed)

mentioned in commit 14a28e2e