Effective Field Theory for Heavy Vector Resonances Coupled to the Standard Model

Abstract

We construct an effective field theory describing the decays of a heavy vector resonance $V$ into Standard Model particles. The effective theory is built using an extension of Soft-Collinear Effective Theory called SCET${}_{\mathrm{BSM}}$, which provides a rigorous framework for parameterizing decay matrix elements with manifest power counting in the ratio of the electroweak scale and the mass of the resonance, $\lambda \sim v/m_V$. Using the renormalization-group evolution of the couplings in the effective Lagrangian, large logarithms associated with this scale ratio can be resummed to all orders. We consider in detail the two-body decays of a heavy $Z^{\prime }$ boson and of a Kaluza-Klein gluon at leading and subleading order in $\lambda$. We illustrate the matching onto SCET${}_{\mathrm{BSM}}$ with a concrete example of a UV-complete new-physics model.

arXiv comment33 pages, 6 figures, 2 appendices

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