Probing electroweak phase transition in the singlet Standard Model via bbγγ and 4l channels

• Published in: The journal of high energy physics Vol. 2023; no. 12; pp. 18 - 29
• Main Authors: Zhang, Wenxing, Li, Hao-Lin, Liu, Kun, Ramsey-Musolf, Michael J., Zeng, Yonghao, Arunasalam, Suntharan
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 04.12.2023; Springer Nature B.V; SpringerOpen
• Subjects: Channels; Classical and Quantum Gravitation; Discriminant analysis; Electroweak model; Elementary Particles; Higgs Properties; High energy physics; Luminosity; Mathematical models; Multi-Higgs Models; Other Weak Scale BSM Models; Parameters; Phase transitions; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Regular Article - Theoretical Physics; Relativity Theory; Resonance; Searching; Specific BSM Phenomenology; String Theory; Other Weak Scale BSM Models; Higgs Properties; Specific BSM Phenomenology; Multi-Higgs Models
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP12(2023)018

A bstract We investigate the prospects for resonant di-Higgs and heavy Higgs production searches at the 14 TeV HL-LHC in the combination of bbγγ and 4 l channels, as a probe of a possible first order electroweak phase transition in real singlet scalar extension of the Standard Model. Event selection follows those utilized in the bbγγ and 4 l searches by the ATLAS Collaboration, applied to simulation using benchmark parameters that realize a strong first order electroweak phase transition. The output of discriminant analysis is implemented by numerical calculation, optimised by the joint restriction from the two channels. The prospective reach for bbγγ /4 l channel could be more competitive in probing the electroweak phase transition at lower/higher resonance masses. With 3 ab − 1 integrated luminosity, the combination of the bbγγ and 4 l channels can discover/exclude a significant portion of the viable parameter space that realizes a strong first order phase transition when the resonance mass is heavier than 500 GeV.