Observation of the γγ → ττ process in Pb + Pb collisions and constraints on the τ-Lepton anomalous magnetic moment with the ATLAS detector
This Letter reports the observation of τ-lepton-pair production in ultraperipheral lead-lead collisions Pb+Pb→Pb(γγ→ττ)Pb and constraints on the τ-lepton anomalous magnetic moment aτ. The dataset corresponds to an integrated luminosity of 1.44 nb−1 of LHC Pb+Pb collisions at √sNN=5.02 TeV recorded b...
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
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12 October 2023
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| In: |
Physical review letters
Year: 2023, Jahrgang: 131, Heft: 15, Pages: 1-23 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.131.151802 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.1103/PhysRevLett.131.151802 Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.131.151802 
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| Verfasserangaben: | ATLAS Collaboration |
MARC
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| 245 | 1 | 0 | |a Observation of the γγ → ττ process in Pb + Pb collisions and constraints on the τ-Lepton anomalous magnetic moment with the ATLAS detector |c ATLAS Collaboration |
| 246 | 3 | 3 | |a Observation of the gamma gamma rightwards arrow tau tau process in Pb plus Pb collisions and constraints on the tau-Lepton anomalous magnetic moment with the ATLAS detector |
| 264 | 1 | |c 12 October 2023 | |
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| 500 | |a Gesehen am 14.02.2024 | ||
| 500 | |a ATLAS Collaboration: G. Aad, L.M. Baltes, F. Bartels, M.M. Czurylo, F. Del Rio, S.J. Dittmeier, M. Dunford, S. Franchino, M. Klassen, T. Mkrtchyan, P.S. Ott, D.F. Rassloff, S. Rodriguez Bosca, C. Sauer, A. Schoening, H-C. Schultz-Coulon, V. Sothilingam, R. Stamen, P. Starovoitov, L. Vigani, S.M. Weber, M. Wessels, J. Zinsser [und 2896 weitere] | ||
| 520 | |a This Letter reports the observation of τ-lepton-pair production in ultraperipheral lead-lead collisions Pb+Pb→Pb(γγ→ττ)Pb and constraints on the τ-lepton anomalous magnetic moment aτ. The dataset corresponds to an integrated luminosity of 1.44 nb−1 of LHC Pb+Pb collisions at √sNN=5.02 TeV recorded by the ATLAS experiment in 2018. 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 significance exceeding 5 standard deviations and a signal strength of μττ=1.03+0.06−0.05 assuming the standard model value for aτ. 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<aτ<0.024. | ||
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