New Pythia8 Hooks for showering Powheg events

Hi @ewelina,

I am merging three new Pythia8 UserHooks.

• PowhegHooksBB4Ltms, which replaces PowhegHooksBB4L, to be used for showering BB4L events (AGENE-1941). I have validated its implementation against the standalone Pythia8 and against the author's events.

• TopRecoilHook, to force the recoil of subleading emissions off a top decay to recoil against the top resonance itself. Also here I checked I get in athena the same output as the Pythia8 standalone code.

• PowhegV_EW, to perform a simultaneous veto of QED and QCD emissions, needed for Powheg processes with NLO EW (AGENE-1807). This latter hook was prepared by @gpanizzo, and I have only tested it does run in athena. While more validation will be needed it would still be useful to have it in a release. The code itself prints out a warning that it should not be used without further validation.

It may be good if @gpanizzo or one of the other experts could have one last look at these.

cheers, Simone

added 21.6 Generators Pythia8 labels

Thanks @amoroso ! I will wait for approval from the Pythia8 experts. Tagging @gpanizzo @abuckley and @mshapiro .

added 1 commit

• 79e89b18 - Verbose warnings; now actually reading radtype

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As agreed with @amoroso, I just committed very minor changes.

It's fine with me to merge. Thanks @amoroso and @ewelina

G

marked this merge request as ready

This merge request affects 1 package:

• Generators/Pythia8_i

This merge request affects 4 files:

• Generators/Pythia8_i/CMakeLists.txt
• Generators/Pythia8_i/src/UserHooks/PowhegBB4Ltms.cxx
• Generators/Pythia8_i/src/UserHooks/PowhegV_EW.cxx
• Generators/Pythia8_i/src/UserHooks/TopRecoilHook.cxx

added review-pending-level-1 label

CI Result SUCCESS (hash 79e89b18)

	AthGeneration
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
AthGeneration: number of compilation errors 0, warnings 1
For experts only: Jenkins output [CI-MERGE-REQUEST-GCC62-CC7 726]

merged

mentioned in commit 0aa39576

added sweep:ignore label