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Introduce the key data structure for Z′-models over the Standard Model: integer charge assignments for the chiral SM fermions with n families.

This provides a lightweight foundation for the Z′ API (issue #880), on which family symmetries, anomaly cancellation conditions, and equivalence relations will be built in subsequent work.

Introduce the key data structure for Z′-models over the Standard Model:
integer charge assignments for the chiral SM fermions with n families.

This provides a lightweight foundation for the Z′ API (issue HEPLean#880), on which
family symmetries, anomaly cancellation conditions, and equivalence relations
will be built in subsequent work.
@ValentinBredemestre ValentinBredemestre requested a review from a team as a code owner January 17, 2026 20:51
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/-- Integer Z′-charges for the `n`-family Standard Model fermions (without RHN). -/
abbrev SMZPrimeCharges (n : ℕ) : Type := Fin 5 → Fin n → ℤ
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Looks, good, although I would make this a structure not an abbreviation. You could even make the fields of the abbreviation Q, U, D etc. I would also make a note in

https://github.com/HEPLean/PhysLean/blob/master/PhysLean/Particles/StandardModel/AnomalyCancellation/Basic.lean

About this new definition of things

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