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5d0eb2e8

By: Kaapo Seppänen <seppanenkaapo@gmail.com> 

Add chemical potentials to the bundled SM model

Every particle carrying baryon number, electric charge, or lepton flavour
now has a chemical potential derived from the external parameters muB, muQ,
muLe, muLmu and muLtau in a new CHEMICALPOTENTIAL block. Antiparticles get
the opposite value via `minus_<name>` parameters, which UFO
Parameter.__neg__ resolves when Particle.anti() negates the attribute.

muB defaults to 3 so that it survives restriction with simplification,
which freezes zero-valued external parameters to ZERO; the remaining
chemical potentials default to zero. Chemical potentials enter no
couplings, so vertices, couplings and propagators are unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
GitHub
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