Reconciling the LEP and Slac Measurements of Sin^2(Θ_W)

Abstract

We consider whether a discrepancy between the SLAC and LEP measurements of $\Sw$ can be explained by new physics. We find that only the contribution of a new neutral gauge boson, $Z^{\prime }$, nearly degenerate with the Z can affect the SLAC measurement while leaving the LEP observables almost unaffected. We briefly discuss possible signals for this new gauge boson, including changes in the $Z$ lineshape when measured with polarised electrons, small changes in $R_b$, $A_{FB}^e$, and larger changes in two jet and $t\bar{t}$ production at hadron colliders.

8 pages , CERN-TH.7474/94, OUTP9424P

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• Radiative Correction Effects of a Very Heavy Top
• Precise Measurement of the Left-Right Cross Section Asymmetry in $Z$ Boson Production by $\ee$ Collisions

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