TruthUtils: add baryonNumber3 and baryonNumber helper functions

The baryon number is defined as:

B = (1/3)*( n_q - n_{qbar} )

where n_q⁠ is the number of quarks, and ⁠n_{qbar} is the number of antiquarks. By convention, squarks have the same quantum numbers as the corresponding quarks (modulo spin and R), so have baryon number 1/3.

The baryonNumber3() helper function returns an integer value (3*B), while baryonNumber() returns a floating point value equal to a third of this (c.f. the existing charge3() and charge() functions).

Tests for these functions will be added in a later MR.

This merge request affects 1 package:

• Generators/TruthUtils

This merge request affects 2 files:

• Generators/TruthUtils/TruthUtils/AtlasPID.h
• Generators/TruthUtils/test/pdgInfo.cxx

Adding @averbyts ,@zmarshal as watchers

added Generators analysis-review-required main review-pending-level-1 labels

CI Result SUCCESS (hash a7848dc9)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis
externals
cmake
make
tests

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Changes are fine and CI succeeds, approving for L1. -L1

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

Approving, Marco (AR shifter)

added analysis-review-approved label and removed analysis-review-required label

merged

mentioned in commit 087df78d