Study of Tau-pair Production in Photon-Photon Collisions at LEP and Limits on the Anomalous Electromagnetic Moments of the Tau Lepton
The DELPHI Collaboration, J. Abdallah, et al
TL;DR
This study measures tau-pair production in photon-photon collisions at LEP, confirming QED predictions and setting new limits on the tau lepton's anomalous electromagnetic moments.
Contribution
It provides the first precise measurement of tau-pair production cross-section at LEP and establishes updated bounds on tau's anomalous magnetic and electric dipole moments.
Findings
Cross-section agrees with QED predictions
Limits on anomalous magnetic moment improved
Limits on electric dipole moment established
Abstract
Tau-pair production in the process e+e- -> e+e-tau+tau- was studied using data collected by the DELPHI experiment at LEP2 during the years 1997 - 2000. The corresponding integrated luminosity is 650 pb^{-1}. The values of the cross-section obtained are found to be in agreement with QED predictions. Limits on the anomalous magnetic and electric dipole moments of the tau lepton are deduced.
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