Add an exponential filter to obtain a flat decay time sample

In this MR, I modified the xAODDecayTimeFilter to be able to filter on long-lived particles based on their decay time.

It is done for all LLPs with the matched pdgID whose decay time is within the given range.

Two additional parameters are added:

1. A flag to turn on or off the flat life time filtering
2. A variable to tell what the seeding lifetime is

Random number generation is inspired by the existing functions in other filters.

This merge request affects 1 package:

• Generators/GeneratorFilters

This merge request affects 2 files:

• Generators/GeneratorFilters/GeneratorFilters/xAODDecayTimeFilter.h
• Generators/GeneratorFilters/src/xAODDecayTimeFilter.cxx

added Generators master review-pending-level-1 labels

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

CI Result SUCCESS (hash 475f37fe)

	Athena	AthGeneration
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 67377]

added review-user-action-required label and removed review-pending-level-1 label

added 1 commit

• b8c9574f - fix leftover texts mismatch

Compare with previous version

This merge request affects 1 package:

• Generators/GeneratorFilters

This merge request affects 2 files:

• Generators/GeneratorFilters/GeneratorFilters/xAODDecayTimeFilter.h
• Generators/GeneratorFilters/src/xAODDecayTimeFilter.cxx

added review-pending-level-1 label and removed review-user-action-required label

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

CI Result SUCCESS (hash b8c9574f)

	Athena	AthGeneration
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 67445]

resolved all threads

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

added review-approved-point1 label

merged

mentioned in commit ea6c546d

added sweep:ignore label