Coupling WW, ZZ unitarized amplitudes to $$\gamma \gamma $$ 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 $$\gamma \gamma $$ γ γ , employing (to NLO) the Higgs-EFT (HEFT) extension of the Standard Model and the Equivalence Theorem, while neglecting all particle mass...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2017-03-01
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| Series: | European Physical Journal C: Particles and Fields |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1140/epjc/s10052-017-4768-y |
| Summary: | Abstract We define and calculate helicity partial-wave amplitudes for processes linking the Electroweak Symmetry Breaking Sector (EWSBS) to $$\gamma \gamma $$ 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 ( $$500~\mathrm{{GeV}}{-}3~\mathrm{{TeV}}$$ 500 GeV - 3 TeV ). We also deal with their unitarization so that resonances of the EWSBS can simultaneously be described in the $$\gamma \gamma $$ γ γ initial or final states. Our resulting amplitudes satisfy unitarity, perturbatively in $$\alpha $$ 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 $$\gamma \gamma $$ γ γ pairs. |
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| ISSN: | 1434-6044 1434-6052 |