Erlangen 2026 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

T: Fachverband Teilchenphysik

T 25: Higgs Physics III

T 25.7: Talk

Tuesday, March 17, 2026, 17:45–18:00, KH 00.016

Constraining Effective Field Theory operators in the HZZ4l channel with CMS — •Christian-Max Sammoray, Matteo Bonanomi, Johannes Haller, and Matthias Schröder — Institut für Experimentalphyisk, Universität Hamburg

The discovery of the Higgs boson in 2012 by the CMS and ATLAS collaborations at the CERN Large Hadron Collider (LHC) set a major milestone in confirming the predictive power of the Standard Model (SM) of particle physics. However, despite its remarkable success, it leaves several unanswered questions, and direct searches for new physics have fallen short in observing new particles that could answer them, thus hinting at the existence of new physics beyond the energy scale reachable at the LHC.

The Standard Model Effective Field Theory (SMEFT) provides a powerful framework to probe such effects indirectly by expanding the SM Lagrangian with higher order operators. In this work, we use simulated CMS data corresponding to data-taking conditions at 13.6 TeV center-of-mass energy to study SMEFT effects in the Higgs to four-lepton channel. Differential cross section measurements are used to constrain new physics within the SMEFT framework.

This talk details the derivation of the parameterization of EFT effects on both the production and decay of the Higgs boson in the four-lepton final state, and how these measurements can be used to obtain constraints on new physics through a maximum likelihood fit.

Keywords: SMEFT; BSM; Indirect search; HZZ*