The strong coupling, unification, and recent data

Abstract

The prediction of the strong coupling assuming (supersymmetric) coupling constant unification is reexamined. We find, using the new electroweak data, ${\alpha }_s(M_Z)\approx 0.129\pm 0.010$. The implications of the large ${\alpha }_s$ value are discussed. The role played by the $Z$ beauty width is stressed. It is also emphasized that high-energy (but not low-energy) corrections could significantly diminish the prediction. However, unless higher-dimension operators are assumed to be suppressed, at present one cannot place strong constraints on the super-heavy spectrum. Non-leading electroweak threshold corrections are also discussed.

12 pages, LaTex + RevTex, uuencoded postscript file (including 13 figures) is attached. Also available at ftp://dept.physics.upenn.edu/pub/Nir

References in corpus (20)

• The Top Quark Mass in Supersymmetric SO(10) Unification
• Electroweak Symmetry Breaking and Bottom-Top Yukawa Unification
• Evidence for Top Quark Production in $\bar{p}p$ Collisions at $\sqrt{s}=1.8$ TeV
• Non-Universal GUT Corrections to the Soft Terms and their Implications in Supergravity Models
• Precision Corrections to Supersymmetric Unification
• Phenomenological Implications of the m_t RGE Fixed Point for SUSY Higgs Boson Searches
• The Bottom Mass Prediction in Supersymmetric Grand Unification; Uncertainties and Constraints
• Implications of Yukawa unification for the Higgs sector in supersymmetric grand-unified models
• GUT effects in the soft supersymmetry breaking terms
• Implications of the Partial Width Z->bb for Supersymmetry Searches and Model-Building
• A determination of the QED coupling at the $Z$ pole
• A Precise Determination of ${\alpha }_s$ from Lattice QCD
• ${\sin }^2{\theta }_W(M_Z)$ ~in the MSSM and Unification of Couplings
• Implications of High Precision Experiments and the CDF Top Quark Candidates
• Gauge Coupling Unification: Strings versus SUSY-GUTs
• Supersymmetric Electroweak Renormalization of the Z-Width in the MSSM (I)
• Light Threshold Effects in Supersymmetric Grand Unified Theories
• Gauge Coupling Unification due to Non-universal Soft Supersymmetry Breaking
• ${\epsilon }_b$ Constraints on the Minimal $SU(5)$ and $SU(5)\times U(1)$ Supergravity Models
• Probing Supergravity Models with Indirect Experimental Signatures

Cited by in corpus (93)

• Supersymmetric Unification Without Low Energy Supersymmetry And Signatures for Fine-Tuning at the LHC
• Toward Realistic Intersecting D-Brane Models
• Neutrino Masses and Mixing: Evidence and Implications
• The QCD Running Coupling
• Implications of Abelian Extended Gauge Structures From String Models
• Implications of Gauge Unification for Time Variation of the Fine Structure Constant
• Naturalness Implications of LEP Results
• Gauge Coupling Unification from Unified Theories in Higher Dimensions
• A Complete Theory of Grand Unification in Five Dimensions
• Theoretical uncertainties in sparticle mass predictions from computational tools
• Global Electroweak Fits and Gauge Coupling Unification
• Branes with GUTs and supersymmetry breaking
• Gauge Coupling Unification in the Exceptional Supersymmetric Standard Model
• Chiral Models of Weak Scale Supersymmetry
• Neutrino Oscillations in a Predictive SUSY GUT
• Inclusive search for supersymmetry using the razor variables in pp collisions at sqrt(s) = 7 TeV
• Strongly Coupled Grand Unification in Higher Dimensions
• 2-Loop Supersymmetric Renormalisation Group Equations Including R-Parity Violation and Aspects of Unification
• U(1) textures and Lepton Flavor Violation
• Radiative Corrections in Precision Electroweak Physics: a Historical Perspective
• Bounds on Supersymmetry from Electroweak Precision Analysis
• The New Minimal Supersymmetric GUT : Spectra, RG analysis and Fermion Fits
• The problems of unification-mismatch and low ${\alpha }_3$: A solution with light vector-like matter
• Grand unification and enhanced quantum gravitational effects
• Focus Point Supersymmetry: Proton Decay, Flavor and CP Violation, and the Higgs Boson Mass
• Gauge mechanism of mediation of supersymmetry breaking
• E6 inspired SUSY models with exact custodial symmetry
• The Quasi-Fixed MSSM
• Sparticle Mass Spectrum in Grand Unified Theories
• Radiative Corrections to a Supersymmetric Relation: A New Approach
• Grand Unification in Higher Dimensions
• Asymmetric Orbifolds and Higher Level Models
• Minimal SU(5) Resuscitated by Long-Lived Quarks and Leptons
• Gauge boson families in grand unified theories of fermion masses: E_6^4 x S_4
• A Minimal Four-Family Supergravity Model
• Matching the Low and High Energy Determinations of ${\alpha }_s(M_z)$ in the MSSM
• Radiative Electroweak symmetry breaking in the MSSM and Low Energy Thresholds
• Non-Canonical Gauge Coupling Unification in High-Scale Supersymmetry Breaking
• Low-Energy Limits of Theories With Two Supersymmetries
• String Scale Gauge Coupling Unification with Vector-like Exotics and Non-Canonical U(1)_Y Normalization
• Baryon Stability on the Higgs Dissolution Edge : Threshold corrections and suppression of Baryon violation in the NMSGUT
• Gauge Coupling Unification with Extra Dimensions and Gravitational Scale Effects
• SUSY GUT Model Building
• Searching for the Standard Model in the String Landscape : SUSY GUTs
• Reconciling Supersymmetric Grand Unification with ${\alpha }_s(m_Z)\approx 0.11$
• R-parity violation in split supersymmetry
• Non-unified gaugino masses in supersymmetric missing partner models with hypercolor
• Four-Generation Low Energy Supersymmetry with a Light Top Quark
• Inclusive search for supersymmetry using razor variables in pp collisions at sqrt(s) = 13 TeV
• Unification of gauge couplings and the tau neutrino mass in Supergravity without R-parity
• Gauge Coupling Unification in the Standard Model
• On Supersymmetric b-tau Unification, Gauge Unification, and Fixed Points
• One-Loop Effects in Supergravity Models with an Additional U(1)
• An Improved Supersymmetric SU(5)
• Semi-perturbative unification with extra vector-like families
• Supersymmetry: From the Fermi Scale to the Planck Scale
• Constraining Grand Unification using first and second generation sfermions
• Proton Decay, Neutrino Oscillations And Other Consequences From Supersymmetric SU(6) With Pseudo-Goldstone Higgs
• Bounds on the Higgs Mass in Variations of Split Supersymmetry
• The Missing Doublet Model Revamped
• Neutrino Democracy And Other Phenomenology From 5D SO(10)
• Neutrinos and Gauge Unification
• Time Variation of Fundamental Constants as a Probe of New Physics
• The supersymmetric spectrum in SO(10) GUTs with gauge-mediated supersymmetry breaking
• The Search for Supersymmetry at the Tevatron Collider
• Precision Gauge Unification from Extra Yukawa Couplings
• From Prototype SU(5) to Realistic SU(7) SUSY GUT
• Unification in models with replicated gauge groups
• Status of the Standard Model and Beyond
• Relating m_Higgs to m_SUSY by a loop factor
• NMSGUT-III: Grand Unification upended
• The Effective Weak Mixing Angle in the MSSM
• Correcting α_3(M_Z) in the NMSGUT
• Inclusive search for supersymmetry in pp collisions at $\sqrt{s}=$ 13 TeV using razor variables and boosted object identification in zero and one lepton final states
• R-Parity Violation: Origin of $\mu$-Term and Other Consequences
• Supersymmetric SU(5) Grand Unification for a Post Higgs Boson Era
• Physics Implications of Precision Electroweak Experiments
• Mass predictions based on a supersymmetric SU(5) fixed point
• The low energy frontier: probes with photons
• Realistic Supersymmetric SU(6)
• A low α_s: Hint of new physics at the GUT scale?
• Predictions of $m_b/m_{\tau }$ and $m_t$ in an Asymptotically Non-Free Theory
• Proton Stability In Supersymmetric SU(5)
• The masses of vector supermultiplet and of the Higgs supertriplet in supersymmetric SU(5) model
• Unity of Forces at the Preon Level with new Gauge Symmetries
• Phenomenological aspects of Supersymmetry: SUSY models and electroweak symmetry breaking
• Radiative Production of Lightest Neutralinos in $e^{+}{e}^{-}$ collisions in Supersymmetric Grand Unified Models
• Grand Unification in Higher Dimensions with Split Supersymmetry
• A Review of the Exceptional Supersymmetric Standard Model
• From dense-dilute duality to self duality in high energy evolution
• Unification of gauge coupling constants in the minimal supersymmtric model with ${\alpha }_s\approx 0.11$
• The Electroweak Symmetry Breaking Riddle
• Gauge and Yukawa Unification in SUSY with Bilinearly Broken R-Parity