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Awramik, M.; Czakon, M.; Freitas, Ayres; Weiglein, G.

doi:10.1103/physrevlett.93.201805

Cited by 99 publications

(32 citation statements)

References 35 publications

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“…For the effective weak mixing angle sin 2 θ f eff we use the parametrisations provided in [67][68][69], which include full two-loop electroweak [68,69] and partial three-loop and four-loop QCD corrections [70][71][72][73][74][75][76][77]. For bottom quarks, the calculations from Refs.…”

Section: Theoretical Calculationsmentioning

confidence: 99%

Update of the global electroweak fit and constraints on two-Higgs-doublet models

et al. 2018

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We present an update of the global fit of the Standard Model electroweak sector to latest experimental results. We include new kinematic top quark and W boson mass measurements from the LHC, a sin 2 θ eff result from the Tevatron, and a new evaluation of the hadronic contribution to α(M 2 Z ). We present tests of the internal consistency of the electroweak Standard Model and updated numerical predictions of key observables. The electroweak data combined with measurements of the Higgs boson coupling strengths and flavour physics observables are used to constrain parameters of two-Higgs-doublet models.

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Section: Theoretical Calculationsmentioning

confidence: 99%

Update of the global electroweak fit and constraints on two-Higgs-doublet models

et al. 2018

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“…• Complete one-and two-loop electroweak corrections, (see Refs. [21,23,27,28,[30][31][32]36] for the original references);…”

Section: Asymmetries and Effective Weak Mixing Anglesmentioning

confidence: 99%

“…After several papers on approximate/partial higher-order corrections, the complete two-loop weak corrections were determined in a series of papers from 2004 to 2018 [27][28][29][30][31][32][33][34][35][36][37]. The correct formulation of the interplay of the 2→2 loop corrections with higher order real QED corrections in the S-matrix approach, also called un-folding of the effective 2→2 Born terms from the realistic 2→n observables, is a topic on its own.…”

Section: Introductionmentioning

confidence: 99%

Electroweak pseudo-observables and Z-boson form factors at two-loop accuracy

Dubovyk

Freitas

Gluza

et al. 2019

J. High Energ. Phys.

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We present Standard Model predictions for the complete set of phenomenologically relevant electroweak precision pseudo-observables related to the Zboson: the leptonic and bottom-quark effective weak mixing angles sin 2 θ eff , sin 2 θ b eff , the Z-boson partial decay widths Γ f , where f indicates any charged lepton, neutrino and quark flavor (except for the top quark), as well as the total Z decay width Γ Z , the branching ratios R , R c , R b , and the hadronic cross section σ 0 had . The input parameters are the masses M Z , M H and m t , and the couplings α s , α. The scheme dependence due to the choice of M W or its alternative G µ as a last input parameter is also discussed. Recent substantial technical progress in the calculation of Minkowskian massive higher-order Feynman integrals allows the calculation of the complete electroweak two-loop radiative corrections to all the observables mentioned. QCD contributions are included appropriately. Results are provided in terms of simple and convenient parameterization formulae whose coefficients have been determined from the full numerical multi-loop calculation. The size of the missing electroweak three-loop or QCD higher-order corrections is estimated. We briefly comment on the prospects for their calculation. Finally, direct predictions for the Zf f vector and axial-vector form-factors are given, including a discussion of separate order-by-order contributions.

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“…[16] we include full two-loop and known higher order SM corrections as computed in ref. [26], as well as gluonic two-loop MSSM corrections obtained in [27]. We further update an experimental constraint from the anomalous magnetic moment of the muon (g − 2) µ for which a discrepancy (denoted by δa SUSY µ ) between measurement and SM predictions (based on e + e − data) persists at the level of 3.5σ [9].…”

Section: Constraintsmentioning

confidence: 99%

Implications for the Constrained MSSM from a new prediction forb→sγ

Roszkowski

Austri²,

Trotta

2007

J. High Energy Phys.

151

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Abstract:We re-examine the properties of the Constrained MSSM in light of updated constraints, paying particular attention to the impact of the recent substantial shift in the Standard Model prediction for BR(B → X s γ). With the help of a Markov Chain Monte Carlo scanning technique, we vary all relevant parameters simultaneously and derive Bayesian posterior probability maps. We find that the case of µ > 0 remains favored, and that for µ < 0 it is considerably more difficult to find a good global fit to current constraints. In both cases we find a strong preference for a focus point region. This leads to improved prospects for detecting neutralino dark matter in direct searches, while superpartner searches at the LHC become more problematic, especially when µ < 0. In contrast, prospects for exploring the whole mass range of the lightest Higgs boson at the Tevatron and the LHC remain very good, which should, along with dark matter searches, allow one to gain access to the otherwise experimentally challenging focus point region. An alternative measure of the mean quality-of-fit which we also employ implies that present data are not yet constraining enough to draw more definite conclusions. We also comment on the dependence of our results on the choice of priors and on some other assumptions.

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Complete Two-Loop Electroweak Fermionic Corrections to the Effective Leptonic Weak Mixing Anglesin2θeffl
M. Awramik
¹
,
M. Czakon
²
,
Ayres Freitas
³

et al.

Cited by 99 publications

References 35 publications

Update of the global electroweak fit and constraints on two-Higgs-doublet models

Update of the global electroweak fit and constraints on two-Higgs-doublet models

Electroweak pseudo-observables and Z-boson form factors at two-loop accuracy

Implications for the Constrained MSSM from a new prediction forb→sγ

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Complete Two-Loop Electroweak Fermionic Corrections to the Effective Leptonic Weak Mixing Anglesin﻿2θefflM. Awramik1, M. Czakon2, Ayres Freitas3 et al.

Cited by 99 publications

References 35 publications

Update of the global electroweak fit and constraints on two-Higgs-doublet models

Update of the global electroweak fit and constraints on two-Higgs-doublet models

Electroweak pseudo-observables and Z-boson form factors at two-loop accuracy

Implications for the Constrained MSSM from a new prediction forb→sγ

Contact Info

Product

Resources

About

Complete Two-Loop Electroweak Fermionic Corrections to the Effective Leptonic Weak Mixing Anglesin2θeffl
M. Awramik
¹
,
M. Czakon
²
,
Ayres Freitas
³

et al.