Zeequarks

Zeequarks are hypothetical fermionic particles proposed in certain extensions of the Standard Model. They are quark-like in their color charge and spin of 1/2 but differ in their origin and interactions. In various theoretical contexts, zeequarks arise in models that extend the gauge structure or treat quarks as composite rather than fundamental.

In some frameworks zeequarks appear as constituents in composite-quark scenarios or as members of a hidden or dark sector with a new confining gauge interaction. They can be vector-like with respect to the electroweak interaction to avoid anomalies, or possess chiral couplings depending on the model. Zeequarks may come in several generations and can carry electric charges that are ordinary or exotic, with masses typically envisioned to lie well above the electroweak scale, often in the TeV range.

Interactions and phenomenology: Zeequarks would carry color charge, or a similar new charge, and could form bound states such as zeequarkonia. They would decay to Standard Model quarks and bosons through mixing with ordinary quarks or via new interactions, producing collider signatures such as resonances in dijet or boson-plus-jet channels, or events with heavy flavor. Some constructions allow a stable neutral component, which could contribute to dark matter.

Experimental status: There is no experimental confirmation of zeequarks to date. Collider searches for heavy quark–like resonances have set lower bounds on their masses, typically in the multi-hundred GeV to multi-TeV range depending on decay modes and couplings. Indirect constraints from precision measurements also restrict the parameter space.

Outlook: Zeequarks remain speculative and are part of broader explorations of physics beyond the Standard Model. Future high-energy colliders and dedicated analyses could test their viability.