Electroweak phase transition and baryogenesis in composite Higgs models

By S. Bruggisser, B. Harling, O. Matsedonskyi, G. Servant. Journal of High Energy Physics, 2018

133 citations recorded by the source corpus.

We present a comprehensive study of the electroweak phase transition in composite Higgs models, where the Higgs arises from a new, strongly-coupled sector which confines near the TeV scale. This work extends our study in ref. [1]. We describe the confinement phase transition in terms of the dilaton, the pseudo-Nambu-Goldstone boson of broken conformal invariance of the composite Higgs sector. From the analysis of the joint Higgs-dilaton potential we conclude that in this scenario the electroweak phase transition can naturally be first-order, allowing for electroweak baryogenesis. We then extensively discuss possible options to generate a sufficient amount of CP violation — another key ingredient of baryogenesis — from quark Yukawa couplings which vary during the phase transition. For one such an option, with a varying charm quark Yukawa coupling, we perform a full numerical analysis of tunnelling in the Higgs-dilaton potential and determine regions of parameter space which allow for successful baryogenesis. This scenario singles out the light dilaton region while satisfying all experimental bounds. We discuss future tests. Our results bring new opportunities and strong motivations for electroweak baryogenesis.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/3692801423053a5477fb240a22967645d95f5de8

How researchers see this paper

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In Astronomy and Astrophysics

1. Marek Lewicki
2. John Ellis
3. J. No
4. V. Vaskonen
5. C. Caprini
6. E. Barausse
7. M. Volonteri
8. T. Konstandin

In Nuclear and High Energy Physics

1. Marek Lewicki
2. John Ellis
3. J. No
4. T. Konstandin
5. C. Caprini
6. V. Vaskonen
7. G. Servant
8. S. Huber

Citations in the corpus

• Updated predictions for gravitational waves produced in a strongly supercooled phase transition (2020, background): “However, the direct detection of gravitational waves (GWs) by the LIGO and Virgo Collaborations [5] has recently stimulated widespread interest in the potential observability of GWs [6] produced in such a transition [7–47].”
• Unveiling the gravitational universe at μ-Hz frequencies (2019, background): “beyond the standard model (BSM) predict a first order EWPT, often together with baryogenesis processes [42, 57, 58, 68, 72, 73, 95, 147, 164, 184].”
• Detecting gravitational waves from cosmological phase transitions with LISA: an update (2019, background): “EWPT, allowing for viable EW baryogenesis even in minimal CH scenarios [37, 38].”
• Beyond the Standard Models with cosmic strings (2019, background): “It was stressed that nearly-conformal scalar potentials naturally lead to such short, with Ne ∼ 1 − 15, periods of inflation [51, 52, 54].”
• Baryogenesis from the weak scale to the grand unification scale (2020, methodology): “Particularly stringent are the following upper bounds on the electron dipole moment (EDM) obtained by the ACME eperiment (Baron et al., 2014; Andreev 13 There is extensive literature on GWs from first-order phase transitions that lead to signals in the sensitivity range of LISA (Caprini et al., 2020”