On new physics off the Z peak in $H \rightarrow \ell^+\ell^- γ$
Fuente:
arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866912312637521920 |
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| author | Kachanovich, Aliaksei Kimus, Jean Lowette, Steven Tytgat, Michel H. G. |
| author_facet | Kachanovich, Aliaksei Kimus, Jean Lowette, Steven Tytgat, Michel H. G. |
| contents | Motivated by a small but intriguing excess observed in the decay mode $ H\rightarrow \ell^+\ell^- γ$ reported by both the ATLAS and CMS collaborations, we explore the possibility that new physics contributes directly to the effective $ H \ell \overline{\ell} γ$ coupling rather than modifying the $ Z $ peak. Concretely, we consider a dimension-8 operator that could arise from new particles via box diagrams. Such non-resonant contribution may provide an alternative origin for current or future excesses. We examine how experimental cuts may distinguish between possible modifications of the $ Z $ peak and non-resonant contributions. The currently measured excess requires that the new physics scale is relatively low $( Λ_R \sim v $). However, we show that it may remain within current experimental bounds. In particular, we illustrate this using a simplified model, motivated by the dark matter problem, and discuss its other experimental constraints. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_08659 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | On new physics off the Z peak in $H \rightarrow \ell^+\ell^- γ$ Kachanovich, Aliaksei Kimus, Jean Lowette, Steven Tytgat, Michel H. G. High Energy Physics - Phenomenology High Energy Physics - Experiment Motivated by a small but intriguing excess observed in the decay mode $ H\rightarrow \ell^+\ell^- γ$ reported by both the ATLAS and CMS collaborations, we explore the possibility that new physics contributes directly to the effective $ H \ell \overline{\ell} γ$ coupling rather than modifying the $ Z $ peak. Concretely, we consider a dimension-8 operator that could arise from new particles via box diagrams. Such non-resonant contribution may provide an alternative origin for current or future excesses. We examine how experimental cuts may distinguish between possible modifications of the $ Z $ peak and non-resonant contributions. The currently measured excess requires that the new physics scale is relatively low $( Λ_R \sim v $). However, we show that it may remain within current experimental bounds. In particular, we illustrate this using a simplified model, motivated by the dark matter problem, and discuss its other experimental constraints. |
| title | On new physics off the Z peak in $H \rightarrow \ell^+\ell^- γ$ |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2503.08659 |