Re: how many "forces" (or better, interactions)?

[Leigh Palmer <palmer@sfu.ca>]

> The Higgs interaction is accurately modeled for low-energy
> phenomena by the Yukawa interaction terms in the standard-model
> Lagrangian.  These terms give the quarks and leptons their
> masses, and most of these masses (hence the Yukawa coupling
> constants) are known fairly accurately.  What we don't know
> is what happens at higher energies; at least one new species
> of physical particle seems to be required....

I see. Am I to infer that phenomena at higher energies are not
well modeled by the four interactions known, and that the Higgs
particle's existence is accurately inferred from those higher
energy data? You don't say exactly that.

Leigh