refactor: Replace magic seeding field in Examples

[andiwand]

I believe this is not accurate anymore since we switched out the magic number in the seeding

#2132

[github-actions]

📊: Physics performance monitoring for 9962360

Full contents

physmon summary

• ✅ CKF truth_smeared
• ✅ IVF truth_smeared
• ✅ AMVF truth_smeared
• ✅ Track Summary CKF truth_smeared
• ✅ Seeding truth_estimated
• ✅ CKF truth_estimated
• ✅ IVF truth_estimated
• ✅ AMVF truth_estimated
• ✅ Track Summary CKF truth_estimated
• ✅ Seeding seeded
• ✅ CKF seeded
• ✅ IVF seeded
• ✅ AMVF seeded
• ✅ AMVF (+grid seeder) seeded
• ✅ Track Summary CKF seeded
• ✅ Seeding orthogonal
• ✅ CKF orthogonal
• ✅ IVF orthogonal
• ✅ AMVF orthogonal
• ✅ Track Summary CKF orthogonal
• ✅ Ambisolver seeded
• ✅ Ambisolver orthogonal
• ✅ Seeding ttbar
• ✅ CKF ttbar
• ✅ Ambisolver
• ✅ Track Summary CKF ttbar
• ✅ AMVF ttbar
• ✅ AMVF (+grid seeder) ttbar
• ✅ Truth tracking (GSF)
• ✅ Truth tracking
• ✅ Particles inital fatras
• ✅ Particles final fatras
• ✅ Particles inital geant4
• ✅ Particles final geant4

[codecov]

Codecov Report

Merging #2577 (9962360) into main (df34a3a) will not change coverage.
The diff coverage is n/a.

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  Coverage   49.63%   49.63%           
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  Files         471      471           
  Lines       26687    26687           
  Branches    12277    12277           
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  Hits        13245    13245           
  Misses       4746     4746           
  Partials     8696     8696           

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[AJPfleger]

I looked how we introduced this number. First Appearance in Acts seems to be here (pre-PR time):
fa68459

@paulgessinger suggests that the value could be the real ATLAS-field (maybe taken from Athena).

[andiwand]

I looked how we introduced this number. First Appearance in Acts seems to be here (pre-PR time): fa68459

@paulgessinger suggests that the value could be the real ATLAS-field (maybe taken from Athena).

if I remember correctly @beomki-yeo found a magic number (300) in the seeding implementation which was an approximation for c and exchanged it with the physical value. but we never changed the field with compensated the difference

see #2132

[AJPfleger]

I am still not sure, how the numbers relate. According to #2132 this relation should make sense c * B = const:

299.792458 * 2 = 300 * 1.998616... ~ 300 * 1.99724 (quite off)

Using c^2 * B = const:
299.792458^2 * 2 = 300^2 * 1.9972337... ~ 300^2 * 1.99724 (yes the rounding is wrong)
However, I don't understand the physical basis for this.

[andiwand]

right that does not add up. I could imagine that this value is the product of some kind of optimization

[AJPfleger]

Let's see, if this changes physics^^

[andiwand]

it is only affecting the examples. I updated the ttbar vertexing histograms. they are quite noisy as they are low stat. otherwise it should be uncontroversial and we have one magic number less

[acts-project-service]

🔴 Athena integration test results [0027d4c]

🔴 Some tests have failed!

Please investigate the pipeline!

status	job
🔴	run_workflow_tests_run2_data
🟢	run_unit_tests
🟢	run_ci_tests: ../athena/AtlasTest/CITest/test/ActsWorkflow.sh
🟢	run_ci_tests: ../athena/AtlasTest/CITest/test/ActsValidateTracks.sh
🟢	run_ci_tests: ../athena/AtlasTest/CITest/test/ActsValidateActsCoreSpacePoints.sh
🟢	run_ci_tests: ../athena/AtlasTest/CITest/test/ActsValidateActsSpacePoints.sh
🟢	run_ci_tests: ../athena/AtlasTest/CITest/test/ActsValidateSeeds.sh
🟢	run_ci_tests: ../athena/AtlasTest/CITest/test/ActsValidateOrthogonalSeeds.sh
🟢	run_ci_tests: ../athena/AtlasTest/CITest/test/ActsValidateClusters.sh
🟢	run_ci_tests: ../athena/AtlasTest/CITest/test/ActsPersistifyEDM.sh
🟢	run_ci_tests: ../athena/AtlasTest/CITest/test/ActsKfRefitting.sh
🟢	run_ci_tests: python3 ../athena/Tracking/Acts/ActsGeometry/test/ActsExtrapolationAlgTest.py
🟢	run_ci_tests: python3 ../athena/Tracking/Acts/ActsGeometry/test/ActsITkTest.py
🟢	run_workflow_tests_run4_mc
🔴	run_workflow_tests_run3_mc
🔴	run_workflow_tests_run3_data