Regular Article – Theoretical Physics
Tau at colliders with momentum-dependent form factor
Hanoi University of Science and Technology, 1 Dai Co Viet Road, Hanoi, Vietnam
2 High Energy Accelerator Research Organization, Oho 1-1, 305-0801, Tsukuba, Ibaraki, Japan
Accepted: 8 January 2021
Published online: 2 February 2021
The deviation between the prediction based on the standard model and the measurement of the muon is currently at . If this discrepancy is attributable to new physics, it is expected that the new contributions to the tau even larger than those of muon due to its large mass. However, it is much more difficult to directly measure the tau because of its short lifetime. In this report, we consider the effect of the tau at colliders using a model independent approach. Using the tau pair production channel at the Large Electron Position Collider (LEP), we have determined the allowed range for the new physics contribution of the tau assuming a q-square-dependence ansatz for the magnetic form factor. We also investigated the prospect at future colliders, such as International Linear Collider, the Compact Linear Collider, the Future Circular Collider, and Circular Electron Positron Collider, and determined the expected allowed range for the new physics contribution to the tau anomalous magnetic moment. The best limits are about times more severe than the LEP one due to the beam polarization and the high luminosities at future colliders.
© The Author(s) 2021
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