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Abstract |
In a previous work, Buttazzo and Paradisi [Phys. Rev. D 104, 075021 (2021)], pointed out that heavy new physics (NP) contributions to lepton dipole moments and high-energy cross sections of lepton pairs into Higgs and gamma/Z bosons are connected, if the electroweak symmetry breaking is realized linearly. As a consequence, a multi-TeV muon collider would provide a unique test of NP in the muon g-2 through the study of high-energy processes such as mu+mu- -* h + gamma/Z. Since the analysis involved a Standard Model effective field theory (SMEFT) approach to Higgs processes, it could also be studied by the more general Higgs EFT (HEFT) formulation. We compute the modification of the high-energy cross section mu+mu- -* h + gamma/Z and h -* mu+mu- + gamma/Z decay using the dimension-6 HEFT Lagrangian and compare them with the SMEFT analysis. We find that, within the current HEFT analysis, there are plausible scenarios where the HEFT approach could lead to a higher sensitivity to test the NP contributions in the muon g-2. However, a more precise knowledge of the new HEFT parameters is needed for a definite conclusion, which motivates the search for complementary measurements. |
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