A measurement of the high-mass $τ\barτ$ production cross-section at $\sqrt{s}=13$ TeV with the ATLAS detector and constraints on new particles and couplings

The ATLAS collaboration
JHEP 10 (2025) 054, 2025.

Abstract (data abstract)
The production cross-section of high-mass $\tau$-lepton pairs is measured as a function of the dilepton visible invariant mass, using 140 fb$^{-1}$ of $\sqrt{s}=13$ TeV proton-proton collision data recorded with the ATLAS detector at the Large Hadron Collider. The measurement agrees with the predictions of the Standard Model. A fit to the invariant mass distribution is performed as a function of b-jet multiplicity, to constrain the non-resonant production of new particles described by an effective field theory or in models containing leptoquarks or $Z^\prime$ bosons that couple preferentially to third-generation fermions. The constraints on new particles improve on previous results, and the constraints on effective operators include those affecting the anomalous magnetic moment of the $\tau$-lepton.

  • Table 1

    Figure 6 in the paper

    10.17182/hepdata.155470.v2/t1

    The measured unfolded differential cross sections.

  • Table 2

    10.17182/hepdata.155470.v2/t2

    The combined covariance matrix for the differential cross-section distribution.

  • Table 3

    10.17182/hepdata.155470.v2/t3

    Statistical covariance matrix for the differential cross-section distribution.

  • Table 4

    10.17182/hepdata.155470.v2/t4

    Systematic covariance matrix for the differential cross-section distribution.

Version 2 modifications: Fixed a few minor issues with metadata and labelling

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