Violation of Cp-Invariance, C-Asymmetry, and Baryon Asymmetry of the Universe

Sakharov, A. D.

doi:10.1142/9789812815941_0013

Cited by 556 publications

(817 citation statements)

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“…Electroweak (EW) baryogenesis is an elegant mechanism to explain this asymmetry [10][11][12][13][14][15][16][17][18], which is related to physics at the weak scale, establishing a link between collider phenomenology and cosmology. The asymmetry can be generated provided the EW phase transition (PT) taking place in the early universe is of strong first order [16,18] and that all three Sakharov conditions [19] are fulfilled, namely baryon number violation, C and CP violation and departure from the thermal equilibrium.…”

Section: Introductionmentioning

confidence: 99%

Strong first order electroweak phase transition in the CP-conserving 2HDM revisited

Basler

Krause

Mühlleitner

et al. 2017

J. High Energ. Phys.

166

167

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The discovery of the Higgs boson by the LHC experiments ATLAS and CMS has marked a milestone for particle physics. Yet, there are still many open questions that cannot be answered within the Standard Model (SM). For example, the generation of the observed matter-antimatter asymmetry in the universe through baryogenesis can only be explained qualitatively in the SM. A simple extension of the SM compatible with the current theoretical and experimental constraints is given by the 2-Higgs-Doublet Model (2HDM) where a second Higgs doublet is added to the Higgs sector. We investigate the possibility of a strong first order electroweak phase transition in the CP-conserving 2HDM type I and type II where either of the CP-even Higgs bosons is identified with the SM-like Higgs boson. The renormalisation that we apply on the loop-corrected Higgs potential allows us to efficiently scan the 2HDM parameter space and simultaneously take into account all relevant theoretical and up-to-date experimental constraints. The 2HDM parameter regions found to be compatible with the applied constraints and a strong electroweak phase transition are analysed systematically. Our results show that there is a strong interplay between the requirement of a strong phase transition and collider phenomenology with testable implications for searches at the LHC.

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Section: Introductionmentioning

confidence: 99%

Strong first order electroweak phase transition in the CP-conserving 2HDM revisited

Basler

Krause

Mühlleitner

et al. 2017

J. High Energ. Phys.

166

167

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“…It dates back to 1967, when Sakharov suggested that the baryon asymmetry is not an initial condition of the universe, but might be created later in a process based on particle physics [1]. This idea has gained support from the inflationary scenario, since inflation is supposed to have diluted any pre-existing asymmetry.…”

Section: Introductionmentioning

confidence: 99%

“…We call such configurations half-knots. 1 These typically occur in regions where the Higgs magnitude has a small minimum. They can be stabilized when the Chern-Simons number density adjusts to the winding number density and the Higgs field relaxes towards its ground state, leaving a blob-like half-knot both in winding number and in Chern-Simons number.…”

Section: Introductionmentioning

confidence: 99%

Chern-Simons and winding number in a tachyonic electroweak transition

Meulen

Sexty

Smit

et al. 2006

J. High Energy Phys.

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Abstract:We investigate the development of winding number and Chern-Simons number in a tachyonic transition in the SU(2) Higgs model, motivated by the scenario of cold electroweak baryogenesis. We find that localized configurations with approximately halfinteger winding number, dubbed half-knots, play an important role in this process. When the Chern-Simons number adjusts locally to the winding number, the half-knots can stabilize and acquire half-integer Chern-Simons number as well. We present two examples from numerical simulations: one half-knot that stabilizes early and one that gives rise to a late sphaleron transition. We also study the winding number distribution after the transition and present new results on the development of the Chern-Simons susceptibility.

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“…Nevertheless Baryon Number Violation (BNV) is a necessary condition for the observed asymmetry between matter and antimatter in the universe [3] adn slight violations can even arise from both non-perturbative SM effects [4] and from scenarios of Physics beyond the SM. However, no BNV processes have been observed so far.…”

Section: Motivationsmentioning

confidence: 99%

Search for Baryon Number Violating Top Quark Decays in pp Collisions at sqrt{s}=8 TeV

Gabusi¹

2014

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP 2013)

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A search for the decay of top quarks that violate baryon number conservation is performed using pp collisions produced by the LHC at √ s = 8 TeV [1]. The top quark decay signature considered in this analysis consists of one light lepton (electron or muon), two jets, but no neutrino in the final state. Data collected by the CMS detector [2] and corresponding to an integrated luminosity of 19.6 fb −1 are used for the analysis. The event selection is optimised for top quarks produced in pairs, with one having the baryon-number violating decay and the other the standard model hadronic decay to three jets. No significant excess of events over the expected yields from standard model processes is observed. The upper limits at 95% confidence level on the branching fraction of the baryon-number violating top-quark decay are found to be 0.0016 and 0.0017 for the muon and the electron analyses, respectively.

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Violation of Cp-Invariance, C-Asymmetry, and Baryon Asymmetry of the Universe

Cited by 556 publications

References 0 publications

Strong first order electroweak phase transition in the CP-conserving 2HDM revisited

Strong first order electroweak phase transition in the CP-conserving 2HDM revisited

Chern-Simons and winding number in a tachyonic electroweak transition

Search for Baryon Number Violating Top Quark Decays in pp Collisions at sqrt{s}=8 TeV

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