Opening the window for electroweak baryogenesis

Carena, Marcela; Quirós, M.; Wagner, Carlos E. M.

doi:10.1016/0370-2693(96)00475-3

Cited by 373 publications

(544 citation statements)

References 71 publications

Supporting

Mentioning

522

Contrasting

Order By: Relevance

“…Notice that, independently of the experimental bounds, larger values of A t / m would lead to an instability of the electroweak minimum. Moreover values of A t / m 0.5 are also required in order to obtain a strong enough electroweak phase transition [6]. On the other hand the rough estimate tan β 10 [14,16], coming from the requirement of generation of the observed baryon asymmetry of the Universe, pushes the parameter m towards values m ≫ 1 TeV which justifies a posteriori the study of the effective theory with resummed logarithms.…”

Section: The Higgs Massmentioning

confidence: 99%

“…Finally for the proper vertex threshold ∆λ (∆K) it is easier to match the one-loop Higgs (stop) LE and HE effective potentials, instead of performing the matching diagrammatically (see Fig. 11) 6 .…”

Section: Appendixmentioning

confidence: 99%

“…where 6) In this appendix we sketch the calculation of the one-loop RGE in the ET 8 . In order to present our result it is useful to define…”

Section: Appendixmentioning

confidence: 99%

“…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]. However, a particular region in the space of supersymmetric parameters was found in the MSSM, where electroweak baryogenesis has a chance of being successful [6], dubbed under the name of light stop scenario (LSS).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

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.

show abstract

Section: The Higgs Massmentioning

confidence: 99%

Section: Appendixmentioning

confidence: 99%

“…where 6) In this appendix we sketch the calculation of the one-loop RGE in the ET 8 . In order to present our result it is useful to define…”

Section: Appendixmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

“…However, this value should be taken with caution since the veto of any hard real radiation jets due to our selection cuts could reduce the effective size of the radiative corrections, an effect that is partially but not precisely reproduced by the parton shower in Pythia. 2 After application of the cuts and the K-factor rescaling the signal event number for 100 fb −1 is shown in table 1 for various values of the stop and neutralino masses. Figure 1 shows the distribution of the photon transverse energy for the SM background and the stop signal for mt 1 = 130 GeV and mχ0 1 = 110 GeV (i.e.…”

Section: Jhep10(2008)109mentioning

confidence: 99%

Light stop searches at the LHC in events with one hard photon or jet and missing energy

Carena

Freitas

Wagner

2008

J. High Energy Phys.

View full text Add to dashboard Cite

Low energy supersymmetric models provide a solution to the hierarchy problem and also have the necessary ingredients to solve two of the most outstanding issues in cosmology: the origin of the baryon asymmetry and the source of dark matter. In the MSSM, weak scale generation of the baryon asymmetry may be achieved in the presence of light stops, with masses lower than about 130 GeV. Moreover, the proper dark matter density may be obtained in the stop-neutralino co-annihilation region, where the stop-neutralino mass difference is smaller than a few tens of GeV. Searches for scalar top quarks (stops) in pair production processes at the Tevatron and at the Large Hadron Collider (LHC) become very challenging in this region of parameters. At the LHC, however, light stops proceeding from the decay of gluino pairs may be identified, provided the gluino mass is smaller than about 900 GeV. In this article we propose an alternative method for stop searches in the co-annihilation region, based on the search for these particles in events with missing energy plus one hard photon or jet. We show that this method is quite efficient and, when complemented with ongoing Tevatron searches, allows to probe stop masses up to about 160 GeV, fully probing the region of parameters consistent with electroweak baryogenesis in the MSSM. * Very recently, however, it was proposed that the reach of the Tevatron for small mass differences could be extended by not requiring full reconstruction of the two charm jets [10].

show abstract

Electroweak Baryogenesis and the Minimal Supersymmetric Standard Model

Delépine

1997

NATO ASI Series

View full text Add to dashboard Cite

In principle, the baryon asymmetry of the Universe can be generated at the electroweak phase transition but the experimental lower limit on the Higgs mass seems to rule out a Standard Model scenario. However, it has been shown recently that in the Minimal Supersymmetric Standard Model, the electroweak phase transition can be a strong enough first order one for baryogenesis if the mass of one top squark is close to or smaller than the top mass.

show abstract

Opening the window for electroweak baryogenesis

Cited by 373 publications

References 71 publications

The effective theory of the light stop scenario

The effective theory of the light stop scenario

Light stop searches at the LHC in events with one hard photon or jet and missing energy

Electroweak Baryogenesis and the Minimal Supersymmetric Standard Model

Contact Info

Product

Resources

About