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New CMCs and small fixes for GENIE#490

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kjplows wants to merge 13 commits into
GENIE-MC:masterfrom
kjplows:feature/kplows-new-tunes-and-fixes
Open

New CMCs and small fixes for GENIE#490
kjplows wants to merge 13 commits into
GENIE-MC:masterfrom
kjplows:feature/kplows-new-tunes-and-fixes

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@kjplows kjplows commented May 15, 2026

This PR incorporates the new 40Ar SpectralFunction-based tunes used by SBND, and some small QEL fixes.

More details on the new tunes seen in the SBNSoftware fork, SBNSoftware/Generator/#9:

Adding new tunes for SBN using the MINERvA Nature (T. Cai et al, Nature 614 (2023) 48-53) and elementary-target (A. Meyer et al, arXiv: 2512.14097) papers.

These tunes impact the z-expansion axial form factors. There are a few new sets:

minerva: arXiv, no sum rules applied, kmax=2
minervaFull: arXiv, sum rules applied, kmax=2 (+4 = 6)
minervaNature: Nature, sum rules applied, kmax=4 (+4 = 8)
lqcd: no sum rules applied, kmax=2
lqcdFull: sum rules applied, kmax=2 (+4 = 6)

Apart from the new tunes, there is also a small fix to the SF datafiles for Ar40, compared to what is being used in the SBNSoftware fork (see PR SBNSoftware/Generator/#4 that was merged then reverted)
Additionally, the IntegralNuclearInfluenceCutoff is deactivated (set to really high value) as it introduces a large bias in the QEL xsec; see attached image.

AR23_20i_00_000:
AR23-spline

AR25_20i_00_000:
AR25-spline

@kjplows kjplows marked this pull request as ready for review May 15, 2026 20:48
@kjplows kjplows requested a review from sjgardiner May 15, 2026 20:48
@kjplows kjplows self-assigned this May 15, 2026
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