The muon g-2 discrepancy: new physics or a relatively light Higgs?

Abstract

After a brief review of the muon g-2 status, we discuss hypothetical errors in the Standard Model prediction that might explain the present discrepancy with the experimental value. None of them seems likely. In particular, a hypothetical increase of the hadroproduction cross section in low-energy e+e- collisions could bridge the muon g-2 discrepancy, but it is shown to be unlikely in view of current experimental error estimates. If, nonetheless, this turns out to be the explanation of the discrepancy, then the 95% CL upper bound on the Higgs boson mass is reduced to about 135GeV which, in conjunction with the experimental 114.4GeV 95% CL lower bound, leaves a narrow window for the mass of this fundamental particle.

6 pages, to appear in the Proceedings of the PHIPSI09 Workshop, Oct 13-16, 2009, Beijing, China

References in corpus (25)

• Quest for precision in hadronic cross sections at low energy: Monte Carlo tools vs. experimental data
• Muon g-2: Review of Theory and Experiment
• Precise measurement of the e+ e- to pi+ pi- (gamma) cross section with the Initial State Radiation method at BABAR
• Improved predictions for g-2 of the muon and α_{\rm QED}(M_Z^2)
• The Muon Magnetic Moment and Supersymmetry
• Reevaluation of the hadronic contribution to the muon magnetic anomaly using new e+e- -> pi+pi- cross section data from BABAR
• The Discrepancy Between tau and e+e- Spectral Functions Revisited and the Consequences for the Muon Magnetic Anomaly
• The muon g-2 and the bounds on the Higgs boson mass
• Electroweak two-loop corrections to the effective weak mixing angle
• Revised value of the eighth-order electron g-2
• Revised value of the eighth-order QED contribution to the anomalous magnetic moment of the electron
• Precise mass-dependent QED contributions to leptonic g-2 at order alpha^2 and alpha^3
• The Dipion Mass Spectrum In e+e- Annihilation and tau Decay: A Dynamical (rho0, omega, phi) Mixing Approach
• Long-distance radiative corrections to the di-pion tau lepton decay
• A Global Treatment Of VMD Physics Up To The $\varphi$: I. $e^{+}{e}^{-}$ Annihilations, Anomalies And Vector Meson Partial Widths
• Eighth-Order Vacuum-Polarization Function Formed by Two Light-by-Light-Scattering Diagrams and its Contribution to the Tenth-Order Electron g-2
• Electron, muon and tau magnetic moments: a theoretical update
• Tenth-Order Lepton Anomalous Magnetic Moment -- Second-Order Vertex Containing Two Vacuum Polarization Subdiagrams, One Within the Other
• Reconsidered estimates of the 10th order QED contributions to the muon anomaly
• Tenth-order lepton g-2: Contribution from diagrams containing a sixth-order light-by-light-scattering subdiagram internally
• The width difference of rho vector mesons
• A Global Treatment Of VMD Physics Up To The phi: II. tau Decay and Hadronic Contributions To g-2
• Hadronic light-by-light scattering contribution to the muon g-2
• New results on the hadronic vacuum polarization to the muon g-2
• Can VMD improve the estimate of the muon g-2 ?

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• Radiative Corrections in Precision Electroweak Physics: a Historical Perspective
• SUSEFLAV: program for supersymmetric mass spectra with seesaw mechanism and rare lepton flavor violating decays
• Hadronic Light-by-Light and the Pion Polarizability
• Two-pion low-energy contribution to the muon $g-2$ with improved precision from analyticity and unitarity
• Minimal muon anomalous magnetic moment
• The Muon Anomalous Magnetic Moment and the Pion Polarizability
• SU(5)xSU(5)' unification and D2 parity: Model for composite leptons