Precision tests of the MSSM

Abstract

We present the results of a first global fit to the electroweak observables in the MSSM. The best fit selects either very low or very large values of ~$\tan \beta$ ~and, correspondingly, chargino (higgsino--like) and stop or the ~$CP-$odd Higgs boson are within the reach of LEP 2. Moreover, the best fit gives ~ ${\alpha }_s(M_Z)=0.118_{-0.010}^{+0.005}$, ~which is lower than the one obtained from the SM fits. The overall fit is excellent ~ (${\chi }^2=7.2$ ~for 15 d.o.f. as compared to ~${\chi }^2=11$ ~in the SM). Those results follow from the fact that in the MSSM one can increase the value of ~ $R_b\equiv {\Gamma }_{Z^0\to \bar{b}b}/{\Gamma }_{Z^0\to hadrons}$ ~ {\it without} modyfying the SM predictions for other observables.

10 pages, LaTEX, 7 figures (not included) may be obtained from [email protected] upon request. Modified version of the plenary talk given by S. Pokorski at the ``Beyond the Standard Model IV'', Lake Tahoe, CA, December 1994

References in corpus (16)

• Observation of the Top Quark
• Hadronic contributions to $(g-2)$ of the leptons and to the effective fine structure constant $\alpha (M_Z^2)$
• Theoretical Uncertainties and Phenomenological Aspects of $B\to X_s\gamma$ Decay
• Electroweak Symmetry Breaking with Non-Universal Scalar Soft Terms and Large $\tan \beta$ Solutions
• Precise Measurement of the Left-Right Cross Section Asymmetry in $Z$ Boson Production by $\ee$ Collisions
• Infrared Fixed Point Solution for the Top Quark Mass and Unification of Couplings in the MSSM
• Implications of the Partial Width Z->bb for Supersymmetry Searches and Model-Building
• A determination of the QED coupling at the $Z$ pole
• Determining ${\alpha }_s$ from Measurements at $Z$: How Nature Prompts us about New Physics
• Implications of High Precision Experiments and the CDF Top Quark Candidates
• A Global Fit of LEP/SLC Data with Light Superpartners
• Supersymmetric Electroweak Renormalization of the Z-Width in the MSSM (I)
• THE QUANTUM CORRELATION R_b-R_c IN THE MSSM: MORE HINTS OF SUPERSYMMETRY?
• Matching the Low and High Energy Determinations of ${\alpha }_s(M_z)$ in the MSSM
• Precision Tests of the MSSM
• Supersymmetric Electroweak Renormaliztion of the Z-Width in the MSSM (II)

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• Search for supersymmetry with a light gravitino at the Fermilab Tevatron and CERN LEP colliders
• $K_L\to {\pi }^0{e}^{+}{e}^{-}$ and $B\to X_s{\ell }^{+}{\ell }^{-}$ Decay in the MSSM
• Supersymmetric analysis and predictions based on the CDF eeγγ+ missing E_T event
• The fine-tuning price of LEP
• Haggling over the fine-tuning price
• Supersymmetry versus precision experiments revisited
• A Global chi^2 Analysis of Electroweak Data in SO(10) SUSY GUTs
• Bounds on Supersymmetry from Electroweak Precision Analysis
• Bottom-up approach and supersymmetry breaking
• Low energy supersymmetry with a neutralino LSP and the CDF eeγγ+ missing E_T event
• Matching the Low and High Energy Determinations of ${\alpha }_s(M_z)$ in the MSSM
• Higgsino Cold Dark Matter Motivated by Collider Data
• Chargino Mass and $R_b$ Anomaly
• Probing top quark decay into light stop in the supersymmetric standard model at the upgraded Tevatron
• Indications from Precision Electroweak Physics Confront Theoretical Bounds on the Mass of the Higgs Boson
• The Effective Weak Mixing Angle in the MSSM
• $R_b$ -- $R_c$ Crisis and New Physics
• Z Anomalous Couplings and the Polarization Asymmetry in $\gamma e\to Ze$
• Relic neutralinos in a best-fitted MSSM
• chi^2 Analysis of Supersymmetric Models
• The Top-Quark Width in the Light of $Z$-Boson Physics
• Large Yukawa coupling corrections to scalar quark pair production in $e^{+}{e}^{-}$ annihilation
• Pseudo-Goldstone Bosons in Technicolor Models and the Phenomenology