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Research draft

fermion

vr.tr.fermion · PHY.OBJ

Let an agent explain fermions and their statistics, relay elementary and composite fermions from particle physics references, describe fermionic quasiparticles, and distinguish fermions from bosons.

Thing Registry Physical world and living systems

Research draft, second pass

A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.

written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify

Researched by: Claude

Purpose and description

Let an agent explain fermions and their statistics, relay elementary and composite fermions from particle physics references, describe fermionic quasiparticles, and distinguish fermions from bosons.

A particle with half-integer spin that obeys Fermi-Dirac statistics and the Pauli exclusion principle, so that no two identical fermions occupy the same quantum state, including the elementary quarks and leptons of the Standard Model and composite fermions such as baryons, among them protons, neutrons, Xi baryons, exotic baryons and their antibaryons, as well as quasiparticles such as semi-Dirac fermions in materials; fermions make up matter, in contrast to the force-carrying bosons.

What it is for: Not applicable; a class of particles.

It can be explain the concept and statistics; relay elementary and composite fermions; describe quasiparticles; distinguish from bosons.

Distinguishing features

Pauli exclusion

Fermi-Dirac statistics

Matter constituents

Elementary and composite forms

What it looks like

Not a visible object; particles described by quantum fields.

Physical character

spin: half-integer value - 1/2, 3/2 and so on

elementary fermions in the Standard Model: 12 count - six quarks and six leptons

Xi baryon quark content: one up or down and two strange composition

How it is recognised

Half-integer spin particles

Quarks, leptons, baryons including Xi baryons and exotic baryons, antibaryons, semi-Dirac fermions

Bosons have integer spin; mesons are bosonic composites

Related models

is a kind of - in registry terms

massive quantum particle

obeys - and Fermi-Dirac statistics

Pauli exclusion principle

is contrasted with - with integer spin

boson

includes - as composite fermions

baryon

In practice

Families and kinds

elementary fermions: quarks and leptons

composite fermions: baryons including nucleons, Xi baryons and exotic baryons

antibaryons

Dirac, Weyl and Majorana fermions

fermionic quasiparticles such as semi-Dirac fermions

composite fermions in condensed matter

Standards and regulation

No regulation; Particle Data Group listings

Failure modes and hazards

Confusing fermions with bosons

Confusing elementary and composite fermions

Registry aliases naming specific baryons

Also called

semi-Dirac fermionantibaryonXi baryonN-antibaryonexotic baryonΞ0Ξ-Xi double-charm baryonMajorana fermionheptaquarkbosinoDirac fermiongoldstinobaryondilatinostrange baryonN-baryonDelta baryonCharmed baryonhyperonΔ++Δ+Δ0Δ−charmed lambda baryonlambda baryonsigma baryonΣ+Σ0Σ−

Where this came from

wikidata · CC0 1.0

Source repository Registry entry point

Drafted structure

Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.

Understand What a fermion is.

Science.

Definition

Definition and statistics.

Definition

Definition.

  1. What is a fermion, and what do half-integer spin, Fermi-Dirac statistics and the Pauli principle mean? definition
  2. Is the question about fermions in general, a specific particle or bosons? boundary

Kinds

Kinds.

Kinds

Kinds.

  1. What are the elementary quarks and leptons, and what composite fermions such as baryons, Xi baryons and antibaryons exist? definition
  2. Which entry fits the specific particle? action
Theory Theory.

Science.

Spin-statistics

Spin-statistics theorem.

Spin-statistics

Spin-statistics.

  1. Why does half-integer spin imply Fermi-Dirac statistics, and how do Dirac, Weyl and Majorana fermions differ? provenance
  2. Which references are standard? provenance

Matter

Fermions and matter.

Matter

Matter.

  1. How does the Pauli principle explain atomic structure, degeneracy pressure and the stability of matter? provenance
  2. Which entry fits degenerate matter? action
Materials Quasiparticles.

Science.

Quasiparticles

Fermionic quasiparticles.

Quasiparticles

Quasiparticles.

  1. What are semi-Dirac, Weyl and Majorana quasiparticles in materials, and why do they matter? provenance
  2. Which sources are cited? provenance

Exotic

Exotic baryons.

Exotic

Exotic.

  1. What are exotic baryons such as pentaquarks, and how were they found? provenance
  2. Which entry fits exotic baryon? action
Context History and experiments.

Context.

History

History.

History

History.

  1. How did Fermi, Dirac and Pauli develop the concept, and how were quarks and Xi baryons discovered? provenance
  2. Which entry fits the history of particle physics? action

Experiments

Experiments.

Experiments

Experiments.

  1. How are fermions studied at colliders and in ultracold atom experiments? provenance
  2. Which entry fits Fermi gas? action

What the second pass must settle

  • Should baryon and quark be the primary linked entries?
  • How should Particle Data Group sources be linked?
  • The registry entry has merged aliases naming specific baryons and quasiparticles; should they be split off?
Draft as JSON