Measurement of the τ lepton polarization in Z boson decays in proton-proton collisions at (Formula presented.)

The CMS collaboration [email protected]

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Abstract

The polarization of τ leptons is measured using leptonic and hadronic τ lepton decays in Z → τ+ τ events in proton-proton collisions at (Formula presented.) recorded by CMS at the CERN LHC with an integrated luminosity of 36.3 fb−1. The measured τ lepton polarization at the Z boson mass pole is Pτ(Z) = −0.144 ± 0.006 (stat) ± 0.014 (syst) = −0.144 ± 0.015, in good agreement with the measurement of the τ lepton asymmetry parameter of Aτ = 0.1439 ± 0.0043 = − Pτ(Z) at LEP. The τ lepton polarization depends on the ratio of the vector to axial-vector couplings of the τ leptons in the neutral current expression, and thus on the effective weak mixing angle sin2 θWeff , independently of the Z boson production mechanism. The obtained value sin2 θWeff = 0.2319 ± 0.0008(stat) ± 0.0018(syst) = 0.2319 ± 0.0019 is in good agreement with measurements at e+ e colliders. [Figure not available: see fulltext.].

Original languageEnglish
Article number101
JournalJournal of High Energy Physics
Volume2024
Issue number1
DOIs
Publication statusPublished - Jan 2024

Bibliographical note

Publisher Copyright:
© 2024, The Author(s).

Keywords

  • Hadron-Hadron Scattering
  • Tau Physics

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