Exploring Background Contributions in $H \to Z γ$ Decay
Fuente:
arXiv
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| Autore principale: | |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866914174738628608 |
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| author | Kachanovich, Aliaksei |
| author_facet | Kachanovich, Aliaksei |
| contents | The rare decay $H \to Zγ$ has been investigated by both the ATLAS and CMS Collaborations, with each reporting an excess in Run~2 in 2023 characterized by $μ= 2.2 \pm 0.7$. This anomaly was initially attributed to possible modifications of the $HZγ$ vertex. However, because the $H \to Zγ$ signal is reconstructed via the $H \to \ell\ellγ$ channel, background effects -- particularly those from processes that mimic the same final state -- may have been underestimated. In this work, we re-examine these backgrounds in detail and propose that the observed excess could be explained by an additional BSM-induced contribution. We present both an effective field theory framework and a UV-complete model that provide the necessary rates and a consistent interpretation of the data. The proposed model reproduces the newest ATLAS result, $μ= 1.3^{+0.6}_{-0.5}$, obtained using a narrower dilepton invariant-mass window. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_00544 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Exploring Background Contributions in $H \to Z γ$ Decay Kachanovich, Aliaksei High Energy Physics - Phenomenology The rare decay $H \to Zγ$ has been investigated by both the ATLAS and CMS Collaborations, with each reporting an excess in Run~2 in 2023 characterized by $μ= 2.2 \pm 0.7$. This anomaly was initially attributed to possible modifications of the $HZγ$ vertex. However, because the $H \to Zγ$ signal is reconstructed via the $H \to \ell\ellγ$ channel, background effects -- particularly those from processes that mimic the same final state -- may have been underestimated. In this work, we re-examine these backgrounds in detail and propose that the observed excess could be explained by an additional BSM-induced contribution. We present both an effective field theory framework and a UV-complete model that provide the necessary rates and a consistent interpretation of the data. The proposed model reproduces the newest ATLAS result, $μ= 1.3^{+0.6}_{-0.5}$, obtained using a narrower dilepton invariant-mass window. |
| title | Exploring Background Contributions in $H \to Z γ$ Decay |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2512.00544 |