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000586561 005__ 20250801212021.0
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000586561 0247_ $$2arXiv$$aarXiv:2311.16253
000586561 0247_ $$2datacite_doi$$a10.3204/PUBDB-2023-03958
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000586561 041__ $$aEnglish
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000586561 088__ $$2arXiv$$aarXiv:2311.16253
000586561 088__ $$2CERN$$aCERN-TH-2023-202
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000586561 1001_ $$aBertuzzo, Enrico$$b0
000586561 245__ $$aALPs, the on-shell way
000586561 260__ $$c2023
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000586561 500__ $$a32 pages + appendices
000586561 520__ $$aWe study how the coupling between axion-like particles (ALPs) and matter can be obtained at the level of on-shell scattering amplitudes. We identify three conditions that allow us to compute amplitudes that correspond to shift-symmetric Lagrangians, at the level of operators with dimension 5 or higher, and we discuss how they relate and extend the Adler's zero condition. These conditions are necessary to reduce the number of coefficients consistent with the little-group scaling to the one expected from the Lagrangian approach. We also show how our formalism easily explains that the dimension-5 interaction involving one ALP and two massless spin-1 bosons receive corrections from higher order operators only when the ALP has a non-vanishing mass. As a direct application of our results, we perform a phenomenological study of the inelastic scattering $\ell^+\ell^- \to \phi h$ (with $\ell^\pm$ two charged leptons, $\phi$ the ALP and $h$ the Higgs boson) for which, as a result of the structure of the 3-point and 4-point amplitudes, dimension-7 operators can dominate over the dimension-5 ones well before the energy reaches the cutoff of the theory.
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000586561 536__ $$0G:(GEPRIS)390833306$$aDFG project G:(GEPRIS)390833306 - EXC 2121: Quantum Universe (390833306)$$c390833306$$x1
000586561 536__ $$0G:(EU-Grant)101086085$$aASYMMETRY - Essential Asymmetries of Nature (101086085)$$c101086085$$fHORIZON-MSCA-2021-SE-01$$x2
000586561 536__ $$0G:(EU-Grant)860881$$aHIDDeN - Hunting Invisibles: Dark sectors, Dark matter and Neutrinos (860881)$$c860881$$fH2020-MSCA-ITN-2019$$x3
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000586561 650_7 $$2INSPIRE$$aoperator, higher-order
000586561 650_7 $$2INSPIRE$$ascattering amplitude, on-shell
000586561 650_7 $$2INSPIRE$$alepton
000586561 650_7 $$2INSPIRE$$aaxion-like particles
000586561 650_7 $$2INSPIRE$$ainelastic scattering
000586561 650_7 $$2INSPIRE$$ascaling
000586561 650_7 $$2INSPIRE$$aHiggs particle
000586561 650_7 $$2INSPIRE$$astructure
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000586561 7001_ $$0P:(DE-H253)PIP1023796$$aGrojean, Christophe$$b1$$udesy
000586561 7001_ $$0P:(DE-HGF)0$$aSalla, Gabriel M.$$b2$$eCorresponding author
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000586561 9141_ $$y2023
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