A model of quark and lepton compositeness and its flavour signatures

Within a chiral SU(15) gauge theory, quarks and leptons arise as composite bound states ("prebaryons") of massless preons. The Standard Model gauge charges of the preons ensure the existence of three generations of fermions, together with additional vectorlike states lighter than the confinement scale \Lambda_{pre}. Under plausible assumptions about the chiral dynamics, bound states of two prebaryons behave as Higgs doublets, allowing electroweak symmetry breaking to emerge dynamically.

The unified structure of the theory suppresses baryon number-violating operators, leading to a proton lifetime consistent with current limits even for \Lambda_{pre} near 10^{4}-10^{5} TeV. In this work we explore further phenomenological consequences of this framework, emphasizing how its scalar sector and flavor textures give rise to distinctive low-energy patterns among quarks and leptons. These features provide a natural link between compositeness, the origin of Yukawa couplings, and the observed flavor hierarchies of the Standard Model.