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Updated frozen showers library for MC23

Tommaso Lari requested to merge tlari/athena:frozen23v2 into master

A bug was uncovered by physics validation checks on the first version of the frozen showers library which has been merged in !58896 (merged). @ahrynevi has promptly provided new library files which are fixing the mismodeling at large eta (> 4.5) as illustrated in the attached plot (the current version is the red points, the new one is the green points, the panel is the ratio to G4).

energyVSeta_11_100.0.pdf

Since the current version in master is not good, and since we would like to start MC23 simulation very soon, I am proposing to change the default version in master without waiting for the next physics validation results. I am also marking the MR as urgent. We have discussed this strategy at the physics validation coordination meeting today.

This will change the output of Run 2, Run 3, and Run 4 simulation and will require an update of the reference files.

cheers, Tommaso

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