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000632192 005__ 20250801212052.0
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000632192 088__ $$2arXiv$$aarXiv:2307.14976
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000632192 1001_ $$00000-0002-9430-3875$$aAiko, Masashi$$b0
000632192 245__ $$aLeading two-loop corrections to the Higgs di-photon decay in the inert doublet model
000632192 260__ $$c2025
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000632192 500__ $$a20 pages, 6 figures; v2: major revision and extension of the calculation; v3: matches version published in EPJC
000632192 520__ $$aLeading two-loop contributions to the di-photon decay of the Higgs boson are evaluated for the first time in the inert doublet model (IDM). We employ for this calculation the Higgs low-energy theorem, meaning that we obtain corrections to the Higgs decay process by taking Higgs-field derivatives of the leading two-loop contributions to the photon self-energy. Specifically, we have included corrections involving inert BSM Higgs bosons and gauge bosons, as well as external-leg contributions involving inert scalars, gauge bosons and fermions. Our calculation has been performed with a full on-shell renormalization, and in the gauge-less limit. Moreover, we performed two independent calculations, using the background-field method and the pinch technique, in order to apply the Higgs low-energy theorem consistently, and found full agreement between the two calculations. We investigate our results numerically in two scenarios of the IDM: one with a light dark matter (DM) candidate (Higgs resonance scenario), and another with all additional scalars heavy (heavy Higgs scenario). In both cases, we find that the inclusion of two-loop corrections qualitatively modifies the behavior of the decay width, compared with the one-loop (i.e. leading) order, and that they increase the deviation from the Standard Model. Furthermore, we demonstrate that the inclusion of the newly-computed two-loop corrections is essential to reliably interpret the observation or non-observation of a deviation in the Higgs di-photon decay width at current and future colliders.
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000632192 7001_ $$0P:(DE-H253)PIP1094538$$aBraathen, Johannes$$b1$$eCorresponding author
000632192 7001_ $$00000-0001-6819-4057$$aKanemura, Shinya$$b2
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