• Rapid Communication

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
PDFExport Citation


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


©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

References (Subscription Required)

Click to Expand

Vol. 64, Iss. 7 — 1 October 2001

Reuse & Permissions
Access Options
General Relativity Still Making Waves
September 24, 2015

Clifford Will discusses the importance of Einstein’s general theory of relativity and its relevance for physics research today.

APS and CERN Sign Open Access Agreement for SCOAP3

APS and CERN, the host organization of SCOAP3 (Sponsoring Consortium for Open Access Publishing in Particle Physics), have signed an agreement to make the high-energy physics (HEP) articles published in three leading APS journals open access beginning January 1, 2018. This agreement acts to support the publishing of open access content for wider benefit of the HEP community.

General Relativity
2015 - General Relativity’s Centennial

The editors of the Physical Review journals have curated a collection of landmark papers on General Relativity to celebrate its centennial. These papers are currently free to read.

Authorization Required




Sign up to receive regular email alerts from Physical Review D

Log In



Article Lookup

Paste a citation or DOI

Enter a citation