An effective strong-coupling theory of composite particles in UV-domain

Understand

We briefly review the effective field theory of massive composite particles, their gauge couplings and characteristic energy scale in the UV-domain of UV-stable fixed point of strong four-fermion coupling, then mainly focus the discussions on the decay channels of composite particles into the final states of the SM gauge bosons, leptons and quarks.

• We calculate the rates of composite bosons decaying into two gauge bosons $\gamma\gamma$, $\gamma Z^0$, $W^+W^-$, $Z^0Z^0$ and give the ratios of decay rates of different channels depending on gauge couplings only.
• It is shown that a composite fermion decays into an elementary fermion and a composite boson, the latter being an intermediate state decays into two gauge bosons, leading to a peculiar kinematics of final states of a quark (or a lepton) and two gauge bosons.
• These provide experimental implications of such an effective theory of composite particles beyond the SM.