Preprint

PUBDB-2025-02120

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Leading two-loop corrections to the Higgs di-photon decay in the inert doublet model

Aiko, M. ; Braathen, J. (Corresponding author)DESY* ; Kanemura, S.

2025

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Please use a persistent id in citations: doi:10.3204/PUBDB-2025-02120

Report No.: DESY-23-104; KEK-TH-2539; OU-HET-1194; arXiv:2307.14976

Abstract: Leading 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.

Note: 20 pages, 6 figures; v2: major revision and extension of the calculation; v3: matches version published in EPJC

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Contributing Institute(s):

1. Theorie-Gruppe (T)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. DFG project G:(GEPRIS)520070247 - Untersuchungen von Neue Physik mit generischen Präzisionsberechnungen (520070247) (520070247)
3. DFG project G:(GEPRIS)390833306 - EXC 2121: Quantum Universe (390833306) (390833306)

Experiment(s):

1. No specific instrument

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Database coverage:
; Published

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Journal Article Aiko, M. ; Braathen, J. (Corresponding author)DESY* ; Kanemura, S.
Leading two-loop corrections to the Higgs di-photon decay in the Inert Doublet Model
The European physical journal / C 85(5), 489 (-) [10.1140/epjc/s10052-025-14184-z]-     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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