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

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


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=10.3-1.6+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.

DOI: http://dx.doi.org/10.1103/PhysRevD.64.071701

  • Received 18 April 2001
  • Revised 29 June 2001
  • Published 5 September 2001

© 2001 The 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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