Search for a Z' at the Z resonance

Adriani, O. ; Aguilar-Benitez, M. ; Ahlen, S. ; Gurtu, A. ; et., al (1993) Search for a Z' at the Z resonance Physics Letters B, 306 (1-2). pp. 187-196. ISSN 0370-2693

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The search for an additional heavy gauge boson Z′ is described. The models considered are based on either a superstring-motivated E6 or on a left-right symmetry and assume a minimal Higgs sector. Cross sections and asymmetries measured with the L3 detector in the vicinity of the Z resonance during the 1990 and 1991 running periods are used to determine limits on the Z-Z′ gauge boson mixing angle and on the Z′ mass. For Z′ masses above the direct limits, we obtain the following allowed ranges of the mixing angle, θM at the 95% confidence level: -0.004 ≤ θM ≤ 0.015 for the x model, -0.003 ≤ θM ≤ 0.020 for the φ model, -0.029 ≤ θM ≤ 0.010 for the η model, -0.002 ≤ θM ≤ 0.020 for the LR model.

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Deposited On:20 Feb 2012 06:21
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