Interference effects in gg → H → Zγ beyond leading order
Metadatos
Mostrar el registro completo del ítemAutor
Buccioni, Federico; Devoto, Federica; Djouadi, Abdelhak; Ellis, John; Quevillon, Jérémie; Tancredi, LorenzoEditorial
Elsevier
Fecha
2024-03-26Referencia bibliográfica
F. Buccioni, F. Devoto, A. Djouadi et al. B 851 (2024) 138596. [https://doi.org/10.1016/j.physletb.2024.138596]
Patrocinador
Junta de Andalucía through the Talentia Senior program and the grant PID2021- 128396NB-I00; STFC Grant ST/X000753/1; Excellence Cluster ORIGINS funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy – EXC-2094-390783311; European Research Council (ERC) under the European Union research and innovation programme grant agreements 949279 (ERC Starting Grant HighPHun) and 804394 (ERC Starting Grant HIPQCD)Resumen
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→H→Zγ induced by loops of heavy particles, which is by far the dominant contribution to the signal, and the continuum gg→Zγ 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→γγ signal, they are generally rather small. As such, they do not impact significantly the interpretation of the present measurements of the H→Zγ decay mode.