Coupling WW, ZZ unitarized amplitudes to γ γ in the TeV region
Abstract
We define and calculate helicity partial-wave amplitudes for processes linking the Electroweak Symmetry Breaking Sector (EWSBS) to γ γ , employing (to NLO) the Higgs-EFT (HEFT) extension of the Standard Model and the Equivalence Theorem, while neglecting all particle masses. The resulting amplitudes can be useful in the energy regime (500~{GeV}{-}3~{TeV}). We also deal with their unitarization so that resonances of the EWSBS can simultaneously be described in the γ γ initial or final states. Our resulting amplitudes satisfy unitarity, perturbatively in α , but for all s values. In this way we improve on the HEFT that fails as interactions become stronger with growing s and we provide a natural framework for the decay of dynamically generated resonances into WW, ZZ and γ γ pairs.
- Publication:
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European Physical Journal C
- Pub Date:
- April 2017
- DOI:
- 10.1140/epjc/s10052-017-4768-y
- arXiv:
- arXiv:1609.06206
- Bibcode:
- 2017EPJC...77..205D
- Keywords:
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- High Energy Physics - Phenomenology
- E-Print:
- 23 pages, 9 figures