2024/12/13 by Miralles, Víctor, Peters, Yvonne, Vryonidou, Eleni +1
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2412.10309
The observed baryon asymmetry of the Universe requires new sources of charge-parity (CP) violation beyond those in the Standard Model. In this work, we investigate CP-violating effects in the top-Higgs sector using the Standard Model Effective Field Theory (SMEFT) framework. Focusing on top-pair production in association with a Higgs boson and single top-Higgs associated production at the LHC, we study CP violation in the top-Higgs Yukawa coupling and other Higgs and top interactions entering these processes. By analysing CP-sensitive differential observables and asymmetries, we provide direct constraints on CP-violating interactions in the top-Higgs sector. Our analysis demonstrates how combining tth and thj production can disentangle the real and imaginary components of the top-Yukawa coupling, offering valuable insights into potential sources of CP violation. The sensitivity of these observables to SMEFT operators provides model-independent constraints on the parameter space, advancing the search for new physics in the top-Higgs sector.