Fix z0 calculation in emerging jets trigger

The z0 calculation in TrigJetEJsHypoTool did not take into account the beamspot z position which led to large rates for periods with significant beamspot shifts (see ATR-27603). The implementation now aligns with the recommended way to compute z0 (see https://twiki.cern.ch/twiki/bin/view/AtlasProtected/TrackingCPRecsRun2Final#Calculating_z0_and_d0_significan)

This will lead to rate changes. I am not sure the exact protocol for updating active chains so please let me know if there are additional approvals or discussions needed.

Tagging @cpollard, @jmasik, @strom, @dguest, @ggustavi, @mgenest

This merge request affects 1 package:

• Trigger/TrigHypothesis/TrigHLTJetHypo

This merge request affects 1 file:

• Trigger/TrigHypothesis/TrigHLTJetHypo/src/TrigJetEJsHypoTool.cxx

Adding @peter ,@ayana ,@valentem ,@cantel as watchers

added 23.0 JetEtmiss Trigger TriggerJet review-pending-level-1 labels

mentioned in merge request !63288 (closed)

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

CI Result SUCCESS (hash 26d4cfb9)

	Athena
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 71931]

changed the description

Thank you @dguest and @jburzyns for getting to this so quickly!

added urgent label

Thanks @jburzyns - you're right that this will change chain counts in general, if not in the limited number of data events we test in the CI. Will apply the label manually here. But no other updates are needed in this case.

added changes-trigger-counts label

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

Changes and CI look fine. Approving.

Kira (L1)

added review-approved-point1 label

mentioned in commit 77acdeb7

merged

Tagging @xingguo and @miochoa FYI. You might want to subscribe to changes to the JetHypo package, I see only Ayana and Claire got tagged automatically.

mentioned in merge request !63310 (merged)

mentioned in commit 7d6bdf0d

mentioned in merge request !63505 (closed)