Vector boson scatterings are fundamental processes to shed light on the nature of the electroweak symmetry breaking mechanism. Deviations from the Standard Model predictions on the corresponding observables can be interpreted in terms of effective field theories, that however undergo consistency conditions. In this paper, the same-sign W W scattering is considered within the HEFT context and the correct usage of the effective field theory approach is discussed. Regions of the parameters space are identified where a signal of new physics could be measured at HL-LHC with a significance of more than 5$σ$ and the effective field theory description is consistently adopted. These results are then translated into bounds on the $ξ$ parameter in the composite Higgs scenario. The discussion on the agreement with previous literature and the comparison with the equivalent analysis in the SMEFT case are also included.
Is the Standard Model Effective Field Theory Enough for Higgs Pair Production?
Universitat de Barcelona（巴塞罗那大学）；Istituto Nazionale di Fisica Nucleare, Sezione di Padova（意大利国家核物理研究所帕多瓦分部）；Università di Padova（帕多瓦大学）；Istituto Nazionale di Fisica Nucleare, Sezione di Perugia（意大利国家核物理研究所佩鲁贾分部）；Università di Perugia（佩鲁贾大学）
Exploring Higgs EFT in $t\bar{t}hh$ at High Luminosity LHC
Instituto de Física Teórica, Universidade Estadual Paulista (UNESP)（圣保罗州立大学理论物理研究所）；Departamento de Física Matemática, Instituto de Física, Universidade de São Paulo（圣保罗大学数学物理系物理研究所）；IRFU - CEA, University Paris-Saclay（巴黎萨克雷大学CEA IRFU）；The Hubert Curien Pluridisciplinary Institute, IPHC, CNRS/IN2P3（CNRS/IN2P3伊夫·居里多学科研究所）
Higgs pair production in gluon fusion to higher orders in Higgs Effective Field Theory
Università di Bologna（博洛尼亚大学）；Istituto Nazionale di Fisica Nucleare, Sezione di Bologna（意大利国家核物理研究所博洛尼亚分部）；Università di Padova（帕多瓦大学）；Istituto Nazionale di Fisica Nucleare, Sezione di Padova（意大利国家核物理研究所帕多瓦分部）
Precise predictions for double Higgs production in association with a vector boson in Effective Field Theory
Università di Padova（帕多瓦大学）；Istituto Nazionale di Fisica Nucleare, Sezione di Padova（意大利国家核物理研究所帕多瓦分部）；Scuola Galileiana di Studi Superiori, Università degli Studi di Padova（帕多瓦大学伽利略高等研究学院）
