Preprint

PUBDB-2024-01884

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A log story short: running contributions to radiative Higgs decays in the SMEFT

Grojean, C.DESY* ; Sousa Fialho Guedes, G. L. d. (Corresponding author)DESY* ; Roosmale Nepveu, J.Extern*DESY* ; Salla, G. M.DESY*

2024

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Please use a persistent id in citations: doi:10.3204/PUBDB-2024-01884

Report No.: CERN-TH-2024-075; DESY-24-077; HU-EP-24/15-RTG; arXiv:2405.20371

Abstract: We investigate the renormalization of the radiative decays of the Higgs to two gauge bosons in the Standard Model Effective Field Theory at mass dimension eight. Given that these are loop-level processes, their one-loop renormalization can be phenomenologically important when triggered by operators generated through the tree-level exchange of heavy particles (assuming a weakly coupled UV model). By computing the tree-level matching conditions of all relevant extensions of the Standard Model, we demonstrate that this effect is indeed present in the $h\to \gamma Z$ decay at dimension eight, even though it is absent at dimension six. In contrast, the $h\to gg$ and $h\to \gamma\gamma$ decays can only be renormalized by operators generated by one-loop processes. For UV models with heavy vectors, this conclusion hinges on the specific form of their interaction with massless gauge bosons which is required for perturbative unitarity. We study the quantitative impact of the possible logarithmic enhancement of $h\to \gamma Z$, and we propose an observable to boost the sensitivity to this effect. Given the expected increased precision of next-generation high-energy experiments, this dimension-eight contribution could be large enough to be probed and could therefore give valuable clues about new physics by revealing some of its structural features manifesting first at dimension eight.

Keyword(s): new physics ; effective field theory ; operator: dimension: 6 ; operator: dimension: 8 ; operator: renormalization ; renormalization group ; Higgs particle: radiative decay ; Higgs particle: coupling ; coupling: energy dependence ; Higgs particle --> Z0 photon ; Higgs particle --> photon photon ; Higgs particle --> gluon gluon

Note: 32 pages + 3 appendices, 5 tables and 6 figures

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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)390833306 - EXC 2121: Quantum Universe (390833306) (390833306)
3. GRK 2575 - GRK 2575: Überdenken der Quantenfeldtheorie (417533893) (417533893)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2024

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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 Grojean, C.DESY* ; Sousa Fialho Guedes, G. L. d. (Corresponding author)DESY* ; Roosmale Nepveu, J.Extern* ; Salla, G. M.
A log story short: running contributions to radiative Higgs decays in the SMEFT
Journal of high energy physics 2024(12), 65 (2024) [10.1007/JHEP12(2024)065]2024     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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