Interference Effects in $\mathbf{gg \to H \to Z γ}$ Beyond Leading Order
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arXiv
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| Format: | Preprint |
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2023
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| author | Buccioni, Federico Devoto, Federica Djouadi, Abdelhak Ellis, John Quevillon, Jérémie Tancredi, Lorenzo |
| author_facet | Buccioni, Federico Devoto, Federica Djouadi, Abdelhak Ellis, John Quevillon, Jérémie Tancredi, Lorenzo |
| contents | The ATLAS and CMS collaborations at the LHC have recently announced evidence for the rare Higgs boson decay into a $Z$ boson and a photon. We analyze the interference between the process $gg\! \to \! H \! \to \! Z γ$ induced by loops of heavy particles, which is by far the dominant contribution to the signal, and the continuum $gg \to Z γ$ QCD background process mediated by light quark loops. This interference modifies the event yield, the resonance line-shape and the apparent mass of the Higgs boson. We calculate the radiative corrections to this interference beyond the leading-order approximation in perturbative QCD and find that, while differing numerically from the corresponding effects on the more studied $gg \! \to \! γγ$ signal, they are generally rather small. As such, they do not impact significantly the interpretation of the present measurements of the $H \to Z γ$ decay mode. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_12384 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Interference Effects in $\mathbf{gg \to H \to Z γ}$ Beyond Leading Order Buccioni, Federico Devoto, Federica Djouadi, Abdelhak Ellis, John Quevillon, Jérémie Tancredi, Lorenzo High Energy Physics - Phenomenology High Energy Physics - Experiment The ATLAS and CMS collaborations at the LHC have recently announced evidence for the rare Higgs boson decay into a $Z$ boson and a photon. We analyze the interference between the process $gg\! \to \! H \! \to \! Z γ$ induced by loops of heavy particles, which is by far the dominant contribution to the signal, and the continuum $gg \to Z γ$ QCD background process mediated by light quark loops. This interference modifies the event yield, the resonance line-shape and the apparent mass of the Higgs boson. We calculate the radiative corrections to this interference beyond the leading-order approximation in perturbative QCD and find that, while differing numerically from the corresponding effects on the more studied $gg \! \to \! γγ$ signal, they are generally rather small. As such, they do not impact significantly the interpretation of the present measurements of the $H \to Z γ$ decay mode. |
| title | Interference Effects in $\mathbf{gg \to H \to Z γ}$ Beyond Leading Order |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2312.12384 |