Summary
This paper reports the first observation of tau lepton pair production through photon–photon fusion in proton–proton collisions at 13 TeV, detected with the CMS experiment at the LHC. The measurement yields a fiducial cross section of 12.4−3.1+3.8 femtobarns and provides stringent constraints on potential anomalous electromagnetic properties of the tau lepton, consistent with Standard Model predictions.
UK applicability
This is a fundamental particle physics result from the international LHC collaboration (hosted at CERN, near Geneva) and is not directly applicable to UK agricultural, soil health, or nutritional systems. The findings contribute to tests of the Standard Model but do not relate to farming practices or food system outcomes.
Key measures
Fiducial cross section of γγ→ττ (12.4−3.1+3.8 fb); anomalous magnetic moment aτ=0.0009−0.0031+0.0032; upper limit on electric dipole moment |dτ|<2.9×10−17 e cm (95% CL); statistical significance of 5.3 standard deviations
Outcomes reported
The study reports the first observation of tau lepton pair production via photon–photon fusion in proton–proton collisions at the LHC, with a measured fiducial cross section and constraints on the anomalous magnetic and electric dipole moments of the tau lepton.
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