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Hint for axial-vector contact interactions in the data on e+ee+e(γ) at center-of-mass energies 192–208 GeV

D. Bourilkov
Phys. Rev. D 64, 071701(R) – Published 5 September 2001
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Abstract

For the first time the experiments ALEPH, DELPHI, L3 and OPAL have presented preliminary results for fermion-pair production in e+e collisions on the full data set above the Z pole. A combined analysis of the Bhabha scattering measurements is performed to search for effects of contact interactions. In the case of two axial-vector (AA) currents the best fit to the data is 2.6 standard deviations away from the standard model expectation, corresponding to an energy scale Λ=10.31.6+2.8TeV for contact interactions. For other models no statistically significant deviations are observed, and the data are used to set lower limits at 95% confidence level on the contact interaction scales ranging from 8.2 to 21.3 TeV, depending on the helicity structure.

  • Received 18 April 2001

DOI:https://doi.org/10.1103/PhysRevD.64.071701

©2001 American Physical Society

Authors & Affiliations

D. Bourilkov

  • Institute for Nuclear Research and Nuclear Energy, blvd. Tzarigradsko chaussee 72, BG-1784 Sofia, Bulgaria
  • Institute for Particle Physics (IPP), ETH Zürich, CH-8093 Zürich, Switzerland

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Vol. 64, Iss. 7 — 1 October 2001

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