quark

Supported flavour assignment

Record a resolved flavour or explicit alternatives, together with whether the assignment denotes a quark or antiquark.

1. Which quark flavour and particle or antiparticle designation are asserted, and which remain unresolved? definition
2. Does this assignment come from a theoretical species definition, generator ancestry or experimental flavour evidence? provenance

Compatible charge, spin and colour

Require a consistent charge, spin and colour representation, while distinguishing spin-state estimates and colour-flow conventions from species properties.

1. Are electric charge, spin and colour representation consistent with the proposed flavour and conjugation? definition
2. Which stated properties are inferred from identity, and which have independently measured estimators? measurement
3. Would the same evidence also support a lepton, gluon or composite-hadron interpretation? boundary

Constituent role and environment

Record whether the description concerns valence content, sea contributions or an effective medium excitation, rather than assigning every context a persistent individual constituent.

1. Is the quark described as valence content, a sea contribution or an excitation in a strongly interacting medium? definition
2. Which hadron or medium model supplies the environment and the approximation used? provenance
3. Does the description support an individual quark state, or only flavour content or a statistical distribution? boundary

Parton stage and identity limits

Distinguish hard-process and shower assignments from observable final particles, and retain the conventions behind any ancestry relation.

1. At which calculation or generator stage is this quark assignment defined? definition
2. What resolution scale, factorisation assumptions or event-record conventions make that assignment meaningful? boundary
3. May an agent follow the assignment across stages, or must it preserve a probabilistic or convention-dependent association? action

Qualified four-momentum

Record momentum, uncertainty and any on-shell or virtuality assumptions without silently substituting jet or hadron kinematics.

1. What four-momentum is assigned, in which frame, and with what uncertainty or distribution? measurement
2. Is it a parton-level value, a reconstructed estimate or a proxy taken from an associated jet or hadron? provenance
3. Which on-shell or off-shell assumptions constrain the use of this momentum? boundary

Interpretable mass parameter

Attach the mass definition and relevant scale to a quoted value, preserving distinctions between field-theory, effective and generator parameters.

1. Which mass definition is used, with what value, uncertainty, scheme and applicable scale? measurement
2. Is this a running mass, pole mass, constituent-model parameter or generator parameter? definition
3. What justified conversion or matching procedure is required before comparing it with another mass value? action

Channel admissibility

Evaluate proposed channels using the stated interaction model, initial state, available energy and relevant conservation constraints.

1. Which production, scattering or flavour-changing channel is proposed, and under which interaction model? definition
2. Are its charge balance, energy requirements and other applicable quantum-number constraints satisfied? boundary
3. Which calculation and parameter inputs are needed before an agent can estimate a rate or branching probability? action

Flavour-dependent fate

Record the applicable hadronisation or decay treatment; top quarks decay before hadronising and require a distinct reconstruction path. [ATLAS top-quark overview](https://atlas.cern/updates/feature/top-quark)

1. Does the assigned flavour and environment require hadronisation modelling, quark-level decay modelling or an explicitly coupled treatment? boundary
2. Does a quoted lifetime or decay width belong to the quark description or to a containing hadron? measurement
3. Which descendants or hadronisation products may be linked to this assignment, with what modelling uncertainty? action

Evidence for quark assignment

Identify the measured signatures supporting a quark or flavour interpretation, retaining backgrounds and ambiguity between quark and gluon origins.

1. Which measured signatures support the assignment, such as displaced vertices, identified hadrons, decay reconstruction or scattering distributions? measurement
2. Which dataset, analysis and reconstruction procedure produced those signatures? provenance
3. Which alternative flavours, gluon processes or hadronic backgrounds remain compatible with the evidence? boundary

Assignment strength and use

Preserve tagging calibration, selection dependence and model uncertainty so that a candidate label does not become an unjustified certainty.

1. What efficiencies, mistag rates, uncertainty estimates and validation domain accompany the assignment? measurement
2. Is a reported score a calibrated probability, a discriminant or a generator label? definition
3. Does the evidence justify selecting a flavour-specific analysis, retaining several hypotheses or withholding a resolved assignment? action

Kinds and varieties

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

1. Which of these kinds and varieties hold for the sense of quark this model covers, and on what evidence? provenance