The epsilon variables for electroweak precision tests: a reappraisal

Altarelli, Guido; Barbieri, Riccardo; Caravaglios, Francesco

doi:10.1016/0370-2693(95)00179-o

Cited by 38 publications

(21 citation statements)

References 39 publications

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“…• χ 2 EW for precision electroweak measurements i (i = 1, 2, 3) [69][70][71] or equivalently S, T and U parameters [72,73]. We use the formulas for the self-energies of the gauge bosons γ, W ± and Z in [74] to calculate these observables, and the fit results in [75] to get the χ 2 EW .…”

Section: Strategy In Scanning the Parameter Spacementioning

confidence: 99%

96 GeV diphoton excess in seesaw extensions of the natural NMSSM

et al. 2020

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The Next-to Minimal Supersymmetric Standard Model (NMSSM) with a Type-I seesaw mechanism extends the NMSSM by three generations of right-handed neutrino fields to generate neutrino mass. As a byproduct it renders the lightest sneutrino as a viable DM candidate. Due to the gauge singlet nature of the DM, its scattering with nucleon is suppressed in most cases to coincide spontaneously with the latest XENON-1T results. Consequently, broad parameter spaces in the Higgs sector, especially a light Higgsino mass, are resurrected as experimentally allowed, which makes the theory well suited to explain the long standing bb excess at LEP-II and the continuously observed γγ excess by CMS collaboration. We show by both analytic formulas and numerical results that the theory can naturally predict the central values of the excesses in its broad parameter space, and the explanations are consistent with the Higgs data of the discovered Higgs boson, B−physics and DM physics measurements, the electroweak precision data as well as the LHC search for sparticles. Part of the explanations may be tested by future DM experiments and the SUSY search at the LHC.

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Section: Strategy In Scanning the Parameter Spacementioning

confidence: 99%

96 GeV diphoton excess in seesaw extensions of the natural NMSSM

et al. 2020

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“…Electroweak precision test with the Z-pole data at LEP and SLC has provided highly accurate examination of the SM and stringent constraints on the new physics beyond the SM [16]. Here we make the nonstandard precision analysis of our model with the precision variables ǫ i 's defined by Altarelli et al [17,18]. Our method provides a model independent way for the electroweak precision test.…”

Section: Electroweak Constraintsmentioning

confidence: 99%

SU(4)L×U(1)Xmodels with little Higgs mechanism

2010

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We discuss the aspects of the fermions and gauge bosons in SU (4)L × U (1)X models with little Higgs. We introduce a set of fermions which ensures the cancellation of gauge anomaly, and explicitly show the cancellation of one-loop quadratic divergence to the Higgs mass from all fermion multiplets and all gauge bosons. We present the interactions of the standard model fermions with the physical gauge bosons. We also discuss some phenomenological implications of the model based on recent experimental results.

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“…Several other parametrisations exist where the quadratic terms originating from fermion loops are absorbed into one parameter. The most commonly used parameter sets are the S, T, and U parameters [114] and the " parameters [115], respectively, which are basically equivalent. The " parameters are dened as 11 `= ( `) Born ( 1 + 1 : 20" 1 0:26" 3 ) A 0; FB = A 0; FB Born ( 1 + 3 4 : 72" 1 45:15" 3 ) b = ( b ) Born ( 1 + 1 : 42" 1 0:54" 3 + 2 : 29" b ) ; where QCD corrections and the running of QED are already included in the Born terms.…”

Section: Model Independent Parametrisationmentioning

confidence: 99%

Status of electroweak tests with heavy quarks

Mönig¹

1998

Rep. Prog. Phys.

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The measurements of the partial decay-widths and forward-backward asymmetries for Z ! b b and Z ! c c test the Z couplings to the initial state e + e pair and the heavy quarks in the nal state. The four LEP detectors have registered about four million hadronic Z decays each and SLD at SLC has recorded 300000 Z decays with highly polarised electron beams. The high statistics as well as the good tracking, vertexing and particle identication capabilities of the detectors allow high precision measurements of these quantities. The measurements of the electroweak observables with heavy quarks are reviewed. The results of the dierent analyses are combined and interpreted within the framework of the Standard Model of electroweak interactions. In all cases good agreement with the Standard Model predictions is found, severely limiting the room for modications of these quantities from new physics.

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The epsilon variables for electroweak precision tests: a reappraisal

Cited by 38 publications

References 39 publications

96 GeV diphoton excess in seesaw extensions of the natural NMSSM

96 GeV diphoton excess in seesaw extensions of the natural NMSSM

SU(4)L×U(1)Xmodels with little Higgs mechanism

Status of electroweak tests with heavy quarks

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