| Issue |
EPJ Web Conf.
Volume 282, 2023
8th International Symposium on Symmetries in Subatomic Physics (SSP 2022)
|
|
|---|---|---|
| Article Number | 01009 | |
| Number of page(s) | 9 | |
| DOI | https://doi.org/10.1051/epjconf/202328201009 | |
| Published online | 03 April 2023 | |
https://doi.org/10.1051/epjconf/202328201009
Observation of the γγ → ττ process in Pb+Pb collisions and constraints on the τ-lepton anomalous magnetic moment with the ATLAS detector at LHC
Dipartimento di Fisica "E.Fermi" dell’Università and INFN Pisa
Published online: 3 April 2023
This paper reports the observation of τ-lepton pair production in ultraperipheral lead-lead collisions, Pb(γ)Pb(γ) → ττ and constraints on the τ-lepton anomalous magnetic moment, aτ, measured by the ATLAS experiment. The dataset corresponds to an integrated luminosity of 1.44 nb−1 of LHC Pb+Pb collisions at 
. Selected events contain one muon from a τ-lepton decay, an electron or charged-particle track(s) from the other τ-lepton decay, little additional central-detector activity, and no forward neutrons. The γγ → ττ process is observed in Pb+Pb collisions with a signal strength of µττ= 1.03
. To measure aτ, a template fit to the muon transverse-momentum distribution from τ-lepton candidates is performed, using a dimuon (γγ → µµ) control sample to constrain systematic uncertainties. The observed 95% confidence-level interval for aτ is (−0.057, 0.024).
© The Authors, published by EDP Sciences, 2023
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