{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.fermion","code":"thing-q44363","url":"https://ver.cy/models/thing/q44363/","name":"fermion","alternateNames":["semi-Dirac fermion","antibaryon","Xi baryon","N-antibaryon","exotic baryon","Ξ0","Ξ-","Xi double-charm baryon","Majorana fermion","heptaquark","bosino","Dirac fermion"],"kind":"thing","status":"published","version":"0.2.0-wave.3","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.OBJ"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"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 are constituents of matter, but the distinction between fermions and bosons concerns quantum statistics rather than a division between matter and force carriers, since composite bosons can also constitute matter and not all bosons are force carriers.","purpose":"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.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Pauli exclusion","Fermi-Dirac statistics","Matter constituents","Elementary and composite forms"],"structure":{"bundles":[{"id":"understand","name":"Understand","description":"What a fermion is.","layers":[{"id":"definition","name":"Definition","description":"Definition and statistics.","findings":[{"id":"definition-finding","name":"Definition","description":"Definition.","questions":[{"text":"What is a fermion, and what do half-integer spin, Fermi-Dirac statistics and the Pauli principle mean?","kind":"definition"},{"text":"Is the question about fermions in general, a specific particle or bosons?","kind":"boundary"}]}]},{"id":"kinds","name":"Kinds","description":"Kinds.","findings":[{"id":"kinds-finding","name":"Kinds","description":"Kinds.","questions":[{"text":"What are the elementary quarks and leptons, and what composite fermions such as baryons, Xi baryons and antibaryons exist?","kind":"definition"},{"text":"Which entry fits the specific particle?","kind":"action"}]}]}]},{"id":"theory","name":"Theory","description":"Theory.","layers":[{"id":"spinstatistics","name":"Spin-statistics","description":"Spin-statistics theorem.","findings":[{"id":"spinstatistics-finding","name":"Spin-statistics","description":"Spin-statistics.","questions":[{"text":"Why does half-integer spin imply Fermi-Dirac statistics, and how do Dirac, Weyl and Majorana fermions differ?","kind":"provenance"},{"text":"Which references are standard?","kind":"provenance"}]}]},{"id":"matter","name":"Matter","description":"Fermions and matter.","findings":[{"id":"matter-finding","name":"Matter","description":"Matter.","questions":[{"text":"How does the Pauli principle explain atomic structure, degeneracy pressure and the stability of matter?","kind":"provenance"},{"text":"Which entry fits degenerate matter?","kind":"action"}]}]}]},{"id":"materials","name":"Materials","description":"Quasiparticles.","layers":[{"id":"quasiparticles","name":"Quasiparticles","description":"Fermionic quasiparticles.","findings":[{"id":"quasiparticles-finding","name":"Quasiparticles","description":"Quasiparticles.","questions":[{"text":"What are semi-Dirac, Weyl and Majorana quasiparticles in materials, and why do they matter?","kind":"provenance"},{"text":"Which sources are cited?","kind":"provenance"}]}]},{"id":"exotic","name":"Exotic","description":"Exotic baryons.","findings":[{"id":"exotic-finding","name":"Exotic","description":"Exotic.","questions":[{"text":"What are exotic baryons such as pentaquarks, and how were they found?","kind":"provenance"},{"text":"Which entry fits exotic baryon?","kind":"action"}]}]}]},{"id":"context","name":"Context","description":"History and experiments.","layers":[{"id":"history","name":"History","description":"History.","findings":[{"id":"history-finding","name":"History","description":"History.","questions":[{"text":"How did Fermi, Dirac and Pauli develop the concept, and how were quarks and Xi baryons discovered?","kind":"provenance"},{"text":"Which entry fits the history of particle physics?","kind":"action"}]}]},{"id":"experiments","name":"Experiments","description":"Experiments.","findings":[{"id":"experiments-finding","name":"Experiments","description":"Experiments.","questions":[{"text":"How are fermions studied at colliders and in ultracold atom experiments?","kind":"provenance"},{"text":"Which entry fits Fermi gas?","kind":"action"}]}]}]}]},"agentConduct":{"may":["Explain fermions, spin statistics and the Pauli exclusion principle from physics sources.","Classify a named particle as elementary or composite fermion from authoritative particle data."],"mustNot":["Present a fermion as a boson or misstate its spin.","Treat a specific baryon as identical to the general class.","Present speculative particles as discovered."],"requiresHuman":["Announcing a claimed new particle discovery to the public."]},"ethics":{"considerations":["Overstated physics claims undermine public trust in science."],"affectedParties":["Students","Physicists","Readers of science news"]},"owners":{"steward":"Nobody: a class of particles belongs to no one.","roles":[],"masterSystems":["Particle physics data compilations"]},"relations":[{"target":"Q28877390","type":"parent","note":"registry parent class"},{"target":"massive quantum particle","type":"related","note":"in registry terms"},{"target":"Pauli exclusion principle","type":"related","note":"and Fermi-Dirac statistics"},{"target":"boson","type":"related","note":"with integer spin"},{"target":"baryon","type":"related","note":"as composite fermions"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.fermion","Wikidata: Q44363 (https://www.wikidata.org/wiki/Q44363)"]},"properties":{"applicability":"required","items":["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"]},"recognition":{"applicability":"required","items":["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","Not a visible object; particles described by quantum fields."]},"capabilities":{"applicability":"required","items":["explain the concept and statistics","relay elementary and composite fermions","describe quasiparticles","distinguish from bosons"]},"hazards":{"applicability":"required","items":["Confusing fermions with bosons","Confusing elementary and composite fermions","Registry aliases naming specific baryons"]},"interfaces":{"applicability":"required","items":["No regulation; Particle Data Group listings"]},"context":{"applicability":"required","items":["Not applicable; a class of particles.","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"]}},"sources":[{"title":"Wikidata item Q44363: fermion","url":"https://www.wikidata.org/wiki/Q44363","note":"identity and sense of the item"},{"title":"Wikipedia: Fermion","url":"https://en.wikipedia.org/wiki/Fermion","note":"general description of the item"}],"openQuestions":["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?"],"resources":{"spec":"/models/things/publications/thing-q44363/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q44363/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-13T04:27:06Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T10:10:31+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}