How Many Elementary Particles Are There, Really?
What “elementary particle” means
- Several comments note that “elementary” is definition‑dependent: sometimes it’s “cannot be decomposed further,” sometimes it’s “fundamental field” rather than “little ball.”
- Some argue that counting particle states (spin, polarization, color, chirality, matter/antimatter) as separate “particles” is misleading.
- Others say it’s “logical” if those states behave differently in interactions, but agree it blurs what “different particle” means.
Particles vs fields vs waves
- Many emphasize that in the Standard Model particles are excitations of quantum fields, not tiny billiard balls.
- A strong minority pushes an “everything is waves” view, sometimes dismissing quantization as measurement‑induced, which others call a misunderstanding and challenge for lacking quantitative predictions.
- Fields are suggested as the better “short list” of fundamental entities, though even that might be emergent from something deeper (e.g., a more fundamental substrate, unified field, or E8‑based models).
How many fields / particles?
- Popular public count: “17 particles,” but commenters detail alternative counts:
- ~37 fields post–symmetry‑breaking (quark colors, full gauge set, Higgs).
- ~43 fields if you count more fundamental electroweak fields before symmetry breaking.
- 118 “particles” in the article correspond to all on‑shell degrees of freedom (spin, polarization, color, charge, antimatter).
- Debate over whether different gluon color states are “8 gluons” or just an 8‑dimensional color space; analogy drawn to photon polarizations and choice of basis.
Generations, chirality, and mixing
- Some want to collapse three fermion generations into a few “types” (up‑like, down‑like, lepton, neutrino). Others argue generations behave differently (masses, decays, couplings), so they’re distinct.
- Confusion and correction around chirality vs helicity: chirality is tied to weak interactions and mass generation; helicity is direction‑dependent. Counting chiral components as separate particles is seen by some as overcounting.
Limits, unification, and skepticism
- Mentions of Planck scale as a practical or theoretical limit, preon models, string theory (open/closed strings), unified field theories, supersymmetry, and dark sectors.
- Some expect future theories to reduce the count (e.g., down to a single or few underlying entities); others note Occam’s razor only prefers simpler working theories, and none simpler than the Standard Model currently matches observations.
- A skeptical thread dismisses the “billiard ball” picture and expresses disappointment with the Higgs and big‑science colliders, arguing they can’t address deeper questions like the Big Bang’s origin or consciousness.