The Return of the Spirit

Pietroni, Patrick

doi:10.1007/978-1-349-22493-7_33

Cited by 26 publications

(33 citation statements)

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“…7 and 8 are specific to the MSSM, and that the extensions of the MSSM discussed in Ref. [19] and elsewhere can lead to different phenomenological conclusions. In particular, extended Higgs sector models with additional scalar degrees of freedom can give rise to a strong, first-order electroweak phase transition without ÿ27 e cm (95% C.L.…”

Section: B Phenomenology Updatementioning

confidence: 95%

“…In the MSSM, the requirement of a strong first-order phase transition (shown in [18] to occur in the presence of a light righthanded stop) and constraints from precision electroweak data (requiring the left-handed stop to be heavy [10]) imply that it is the CP-violating interactions of the Higgs superfields-rather than those directly involving the squarksthat drives baryogenesis via this coupling between the two sectors. In extensions of the MSSM, such as the next to minimal supersymmeric standard model (NMSSM) or U1 0 models, the phenomenological requirements that preclude large effects from CP-violation in the squark sector can be relaxed [19], and in this case it is important to know the relative importance of Higgs sector CP-violation. In either case, an analysis of the dynamics whereby the baryon and Higgs sectors communicate is an important component of a systematic, quantitative treatment of EWB.…”

Section: Introductionmentioning

confidence: 99%

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Yukawa and triscalar processes in electroweak baryogenesis

et al. 2006

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We derive the contributions to the quantum transport equations for electroweak baryogenesis due to decays and inverse decays induced by triscalar and Yukawa interactions. In the minimal supersymmetric standard model (MSSM), these contributions give rise to couplings between Higgs and fermion supermultiplet densities, thereby communicating the effects of CP-violation in the Higgs sector to the baryon sector. We show that the decay and inverse decay-induced contributions that arise at zeroth order in the strong coupling, s , can be substantially larger than the O s terms that are generated by scattering processes and that are usually assumed to dominate. We revisit the often-used approximation of fast Yukawa-induced processes and show that for realistic parameter choices it is not justified. We solve the resulting quantum transport equations numerically with special attention to the impact of Yukawa rates and study the dependence of the baryon-to-entropy ratio Y B on MSSM parameters.

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Section: B Phenomenology Updatementioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Yukawa and triscalar processes in electroweak baryogenesis

et al. 2006

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“…Electroweak Baryogenesis may also be realized in the next-to minimal supersymmetric extension of the Standard Model (NMSSM) where some of the MSSM constraints can be relaxed. In particular there are modifications to the tree-level effective potential [32] that may ensure a strongly first order phase transition [33]- [38] without a light stop. On the other hand the Standard Model does not provide any natural source for the observed Dark Matter.…”

Section: Introductionmentioning

confidence: 99%

Electroweak baryogenesis and new TeV fermions

et al. 2005

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New fermions, strongly coupled to the Standard Model Higgs boson, provide a well motivated extension of the Standard Model (SM). In this work we show that, once new physics at heavier scales is added to stabilize the Higgs potential, such an extension of the SM can strengthen the first order electroweak phase transition and make the electroweak baryogenesis mechanism feasible. We propose a SM extension with TeV Higgsinos, Winos and Binos that satisfy the following properties: a) The electroweak phase transition is strong enough to avoid sphaleron erasure in the broken phase for values of the Higgs mass m H < ∼ 300 GeV; b) It provides large CP-violating currents that lead to the observed baryon asymmetry of the Universe for natural values of the CP-violating phase; c) It also provides a natural Dark Matter candidate that can reproduce the observed dark matter density; d) It is consistent with electroweak precision measurements; e) It may arise from a softly broken supersymmetric theory with an extra (asymptotically free) gauge sector; f ) It may be tested by electron electric dipole moment experiments in the near future.

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“…There are also implications for baryogenesis; an extra U (1) ′ might be useful for electroweak baryogenesis, with changes in the scalar sector of such models modifying the nature of the electroweak transition 5,20 , or with cosmic strings providing the needed "out of equilibrium" ingredient 21 . However, alternative models of baryogenesis, in which a lepton asymmetry is first created by the out of equilibrium decay of a heavy Majorana neutrino, and then converted to a baryon asymmetry by electroweak effects 22 , is forbidden by a light Z ′ unless the heavy neutrino carries no c Certain models based on orbifold constructions with Wilson lines 16 also possess the gauge structure and the particle content of the MSSM.…”

Section: Introductionmentioning

confidence: 99%

Z' Physics and Supersymmetry

Cvetič

Langacker

1998

Perspectives on Supersymmetry

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We review the status of heavy neutral gauge bosons, Z ′ , with emphasis on constraints that arise in supersymmetric models, especially those motivated from superstring compactifications. We first summarize the current phenomenological constraints and the prospects for Z ′ detection and diagnostics at the LHC and NLC. After elaborating on the status and (lack of) predictive power for general models with an additional Z ′ , we concentrate on motivations and successes for Z ′ physics in supersymmetric theories in general and in a class of superstring models in particular. We review phenomenologically viable scenarios with the Z ′ mass in the electroweak or in the intermediate scale region. We review the status of heavy neutral gauge bosons, Z ′ , with emphasis on constraints that arise in supersymmetric models, especially those motivated from superstring compactifications. We first summarize the current phenomenological constraints and the prospects for Z ′ detection and diagnostics at the LHC and NLC. After elaborating on the status and (lack of) predictive power for general models with an additional Z ′ , we concentrate on motivations and successes for Z ′ physics in supersymmetric theories in general and in a class of superstring models in particular. We review phenomenologically viable scenarios with the Z ′ mass in the electroweak or in the intermediate scale region.

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The Return of the Spirit

Cited by 26 publications

References 0 publications

Yukawa and triscalar processes in electroweak baryogenesis

Yukawa and triscalar processes in electroweak baryogenesis

Electroweak baryogenesis and new TeV fermions

Z' Physics and Supersymmetry

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