OTHER ${{\mathit H}}$ PRODUCTION PROPERTIES

Higgs quartic self coupling modifier ${{\mathit \kappa}_{{{4}}}}$

INSPIRE   JSON  (beta) PDGID:
S126KH4
Signal strength relative to the SM prediction, ${{\mathit \kappa}_{{{4}}}}$ = ${{\mathit \lambda}_{{{HHHH}}}}$/.
S126KH4
VALUE CL% DOCUMENT ID TECN  COMMENT
• • We do not use the following data for averages, fits, limits, etc. • •
$-230\text{ to }240 $ 95 1
AAD
2025J
 
ATLS 13 TeV, ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$
1  AAD 2025J search for non-resonant ${{\mathit H}}{{\mathit H}}{{\mathit H}}$ production using ${{\mathit H}}$ ${{\mathit H}}$ ${{\mathit H}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$ with data of 126 fb${}^{-1}$ at $\mathit E_{{\mathrm {cm}}}$ = 13 TeV. Two-dimensional likelihood scan of (${{\mathit \kappa}_{{{3}}}}$ (=${{\mathit \kappa}_{{{\lambda}}}}$), ${{\mathit \kappa}_{{{4}}}}$) is shown in their Fig. 9. The quoted values are obtained by assuming ${{\mathit \kappa}_{{{3}}}}$ = 1. Note that the quoted values are calculated using the kappa framework, which outside the unitarity bounds requires additional modification to preserve unitarity for their results.
References