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Composite vectors at the large hadron collider. (English) Zbl 1271.81191
Summary: An unspecified strong dynamics may give rise to composite vectors sufficiently light that their interactions, among themselves or with the electroweak gauge bosons, be approximately described by an effective Lagrangian invariant under $$\mathrm{SU}(2)_L\times\mathrm{SU}(2)_R/\mathrm{SU}(2)_{L+R}$$. We study the production at the LHC of two such states by vector boson fusion or by the Drell-Yan process in this general framework and we compare it with the case of gauge vectors from an $$\mathrm{SU}(2)_L\times\mathrm{SU}(2)_R \times\mathrm{SU}(2)^N$$ gauge model spontaneously broken to the diagonal $$\mathrm{SU}(2)$$ subgroup by a generic $$\sigma$$-model. Special attention is payed to the asymptotic behavior of the different amplitudes in both cases. The expected rates of multi-lepton events from the decay of the composite vectors are also given. A thorough phenomenological analysis and the evaluation of the backgrounds to such signals, aiming at assessing the visibility of composite-vector pairs at the LHC, is instead deferred to future work.

##### MSC:
 81V22 Unified quantum theories 70S05 Lagrangian formalism and Hamiltonian formalism in mechanics of particles and systems
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