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Electroweak Precision Tests: A Concise Review

G. Altarelli, R. Barbieri, F. Caravaglios

TL;DR

This concise review surveys the status of electroweak precision tests, emphasizing the strong agreement between SM predictions and LEP, SLC, and Tevatron data, including the discovery-era top quark mass and precise Z-pole observables. It introduces the epsilon formalism to encapsulate weak radiative corrections and uses global fits to show a preference for a light Higgs, with Higgs-mass sensitivity largely governed by logarithmic terms in theCorrections. The analysis contrasts SM expectations with MSSM scenarios, finding that heavy SUSY decouples to SM-like behavior while light SUSY can yield modest improvements only in restricted regions and is further constrained by direct search limits. Theoretical bounds on the Higgs mass are highlighted, illustrating that precision data favor a weakly coupled Higgs sector and stress the complementarity of indirect fits with direct Higgs searches. Overall, the work argues that precision electroweak data support the SM with a light Higgs or SUSY-based Higgs sector, while leaving room for new physics at higher scales to become apparent through improved measurements, particularly of m_W and sin^2θ_eff.

Abstract

1. Introduction 2. Status of the Data 3. Precision Electroweak Data and the Standard Model 4. A More General Analysis of Electroweak Data 4.1 Basic Definitions and Results 4.2 Experimental Determination of the Epsilon Variables 4.3 Comparing the Data with the Minimal Supersymmetric Standard Model 5. Theoretical Limits on the Higgs Mass 6. Conclusion

Electroweak Precision Tests: A Concise Review

TL;DR

This concise review surveys the status of electroweak precision tests, emphasizing the strong agreement between SM predictions and LEP, SLC, and Tevatron data, including the discovery-era top quark mass and precise Z-pole observables. It introduces the epsilon formalism to encapsulate weak radiative corrections and uses global fits to show a preference for a light Higgs, with Higgs-mass sensitivity largely governed by logarithmic terms in theCorrections. The analysis contrasts SM expectations with MSSM scenarios, finding that heavy SUSY decouples to SM-like behavior while light SUSY can yield modest improvements only in restricted regions and is further constrained by direct search limits. Theoretical bounds on the Higgs mass are highlighted, illustrating that precision data favor a weakly coupled Higgs sector and stress the complementarity of indirect fits with direct Higgs searches. Overall, the work argues that precision electroweak data support the SM with a light Higgs or SUSY-based Higgs sector, while leaving room for new physics at higher scales to become apparent through improved measurements, particularly of m_W and sin^2θ_eff.

Abstract

1. Introduction 2. Status of the Data 3. Precision Electroweak Data and the Standard Model 4. A More General Analysis of Electroweak Data 4.1 Basic Definitions and Results 4.2 Experimental Determination of the Epsilon Variables 4.3 Comparing the Data with the Minimal Supersymmetric Standard Model 5. Theoretical Limits on the Higgs Mass 6. Conclusion

Paper Structure

This paper contains 9 sections, 21 equations, 13 figures, 6 tables.

Table of Contents

  1. Introduction
  2. Status of the Data
  3. Precision Electroweak Data and the Standard Model
  4. A More General Analysis of Electroweak Data
  5. Basic Definitions and Results
  6. Experimental Determination of the Epsilon Variables
  7. Comparing the Data with the Minimal Supersymmetric Standard Model
  8. Theoretical Limits on the Higgs Mass
  9. Conclusion

Figures (13)

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