Regular Article - Theoretical Physics
Constraining the structure of Higgs-fermion couplings with a global LHC fit, the electron EDM and baryogenesis
Department of Physics, University of Chicago, 5720 South Ellis Avenue, 60637, Chicago, IL, USA
2 CERN, Department of Theoretical Physics, 1211, Geneve 23, Switzerland
3 Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstraße 2, 30167, Hannover, Germany
4 Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116, Braunschweig, Germany
5 Instituto de Física Teórica (UAM/CSIC), Universidad Autónoma de Madrid,Cantoblanco, 28049, Madrid, Spain
6 Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany
7 Institut für Kernphysik, Universität zu Köln, Zülpicher Straße 77, 50937, Cologne, Germany
8 Physikalisches Institut, Universität Bonn, Nußallee 12, 53115, Bonn, Germany
9 IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France
10 II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761, Hamburg, Germany
Accepted: 16 June 2022
Published online: 10 July 2022
violation in the Higgs couplings to fermions is an intriguing, but not yet extensively explored possibility. We use inclusive and differential LHC Higgs boson measurements to fit the structure of the Higgs Yukawa couplings. Starting with simple effective models featuring violation in a single Higgs–fermion coupling, we probe well-motivated models with up to nine free parameters. We also investigate the complementarity of LHC constraints with the electron electric dipole moment bound, taking into account the possibility of a modified electron Yukawa coupling, and assess to which extent violation in the Higgs–fermion couplings can contribute to the observed baryon asymmetry of the universe. Even after including the recent analysis of angular correlations in decays, we find that a complex tau Yukawa coupling alone may be able to account for the observed baryon asymmetry, but with large uncertainties in the baryogenesis calculation. A combination of complex top and bottom quark Yukawa couplings yields a result four times larger than the sum of their separate contributions, but remains insufficient to account for the observed baryon asymmetry.
© The Author(s) 2022
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Funded by SCOAP3. SCOAP3 supports the goals of the International Year of Basic Sciences for Sustainable Development.