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High-temperature electroweak baryogenesis with composite Higgs

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von Harling, Benedict 
Matsedonskyi, Oleksii 
Servant, Géraldine 


Electroweak Baryogenesis (EWBG) paired with the Composite Higgs (CH) scenario provides a well-motivated and testable framework for addressing the questions of the origin of the matter-antimatter asymmetry and the naturalness of the electroweak scale. The appeal of both concepts however experiences increasing pressure from the experimental side, as no conclusive signs of the corresponding new physics have been observed. In this note we present a modification of the minimal CH EWBG model, where electroweak symmetry breaking persists to temperatures far above the usually obtained upper bound of ~ 100 GeV. This allows for an increase of the mass of the main actor of EWBG in this scenario — the dilaton. Such a modification results in relaxing the tension with experimental data, generally modifying the phenomenology, and pointing at collider searches for the heavy dilaton as the main direction for its future tests.


Acknowledgements: We thank Sebastian Bruggisser for collaboration during the early stage of this project. We also thank Filippo Sala for discussions. This work is supported by the Deutsche Forschungsgemeinschaft under Germany Excellence Strategy — EXC 2121 “Quantum Universe” — 390833306. OM is supported by STFC HEP Theory Consolidated grant ST/T000694/1. OM also thanks the Mainz Institute for Theoretical Physics (MITP) for its hospitality and support during the completion of this work. BvH would like to thank the ICTP — SAIFR for hospitality during February/March 2023, where part of this work was done, and acknowledges support from FAPESP grant 2021/14335-0.


Phase Transitions in the Early Universe, Cosmology of Theories BSM, Compositeness, Baryo-and Leptogenesis

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Journal of High Energy Physics

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Springer Berlin Heidelberg