On anomalous electroweak baryon-number non-conservation in the early universe

Kuzmin, V.; Rubakov, V. A.; Shaposhnikov, Mikhail

doi:10.1016/0370-2693(85)91028-7

Cited by 3,010 publications

(3,236 citation statements)

References 20 publications

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“…The gluino, with a mass M 3 much below m, may be much heavier than the other gauginos and, in this case, when τ < M 3 it will decouple too. Therefore the corresponding low energy effective Lagrangian is given by 1) where the gluino decoupling is taken into account by the symbol Θg which is equal to 1 (0) for τ ≥ M 3 (τ < M 3 ). For simplicity in (2.1) we do not write the kinetic terms explicitly and we approximate the Lagrangian by taking into account only interactions of the SM fields, charginos, neutralinos and the right-handed stop coming from renormalizable high energy terms proportional to the gauge couplings g ′ , g, g 3 or the supersymmetric top Yukawa coupling λ t without considering flavour mixing.…”

Section: The Effective Theorymentioning

confidence: 99%

“…On the other hand electroweak baryogenesis [1] is a very elegant mechanism for generating the baryon asymmetry of the Universe that can be tested at present accelerator energies and, in particular, at the future LHC. It turns out that electroweak baryogenesis can not be realized within the Standard Model [2,3], while it is not a generic feature of the MSSM for arbitrary values of its parameters [4,5].…”

Section: Introductionmentioning

confidence: 99%

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The effective theory of the light stop scenario

Carena¹,

Nardini²,

Quirós³

et al. 2008

J. High Energy Phys.

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Electroweak baryogenesis in the minimal supersymmetric extension of the Standard Model may be realized within the light stop scenario, where the right-handed stop mass remains close to the top-quark mass to allow for a sufficiently strong first order electroweak phase transition. All other supersymmetric scalars are much heavier to comply with the present bounds on the Higgs mass and the electron and neutron electric dipole moments. Heavy third generation scalars render it necessary to resum large logarithm contributions to perform a trustable Higgs mass calculation. We have studied the one-loop RGE improved effective theory below the heavy scalar mass scale and obtained reliable values of the Higgs mass. Moreover, assuming a common mass m for all heavy scalar particles, and values of all gaugino masses and the Higgsino mass parameter about the weak scale, and imposing gauge coupling unification, a two-loop calculation yields values of the mass m in the interval between three TeV and six hundred TeV. Furthermore for a stop mass around the top quark mass, this translates into an upper bound on the Higgs mass of about 150 GeV. The Higgs mass bound becomes even stronger, of about 129 GeV, for the range of stop and gaugino masses consistent with electroweak baryogenesis. The collider phenomenology implications of this scenario are discussed in some detail.

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Section: The Effective Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effective theory of the light stop scenario

Carena¹,

Nardini²,

Quirós³

et al. 2008

J. High Energy Phys.

View full text Add to dashboard Cite

show abstract

“…, 1 is significantly larger than the expansion rate of the Universe, ∼ T 2 /m Pl , for 10 2 GeV < ∼ T < ∼ 10 12 GeV, so that the anomalous processes are perfectly in thermal equilibrium [23]. Therefore, the corresponding chemical potential should be set to zero:…”

Section: Anomalous Effective Action In the Static Limitmentioning

confidence: 99%

Real-time Chern-Simons term for hypermagnetic fields

Laine

2005

J. High Energy Phys.

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If non-vanishing chemical potentials are assigned to chiral fermions, then a Chern-Simons term is induced for the corresponding gauge fields. In thermal equilibrium anomalous processes adjust the chemical potentials such that the coefficient of the Chern-Simons term vanishes, but it has been argued that there are non-equilibrium epochs in cosmology where this is not the case and that, consequently, certain fermionic number densities and large-scale (hypermagnetic) field strengths get coupled to each other. We generalise the Chern-Simons term to a real-time situation relevant for dynamical considerations, by deriving the anomalous Hard Thermal Loop effective action for the hypermagnetic fields, write down the corresponding equations of motion, and discuss some exponentially growing solutions thereof.

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“…It has been suggested that the electroweak sphaleron in the standard model (SM) plays an important role in that investigation [2]. Since the B asymmetry generated at high energy scales can be washed out by this effect unless B − L = 0, we need a suitable scenario to escape this problem.…”

Section: Introductionmentioning

confidence: 99%

μ-term as the origin of baryon and lepton number asymmetry

Suematsu¹

2005

J. Phys. G: Nucl. Part. Phys.

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We study a possibility of combining an origin of the µ-term and the baryon and lepton number asymmetry. If we assume that the µ-term is generated through a flat direction of a singlet scalar field, the coherent oscillation of this condensate around its potential minimum can store the global U(1) charge asymmetry. The decay of this condensate can distribute this asymmetry into the lepton and baryon number asymmetry as far as its decay occurs at an appropriate temperature. We examine the compatibility between this scenario and the small neutrino mass generation based on both the ordinary seesaw mechanism and the bilinear R-parity violating terms. *

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On anomalous electroweak baryon-number non-conservation in the early universe

Cited by 3,010 publications

References 20 publications

The effective theory of the light stop scenario

The effective theory of the light stop scenario

Real-time Chern-Simons term for hypermagnetic fields

μ-term as the origin of baryon and lepton number asymmetry

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