TY - JOUR
T1 - Measurement of the τ lepton polarization in Z boson decays in proton-proton collisions at (Formula presented.)
AU - The CMS collaboration [email protected]
AU - Hayrapetyan, A.
AU - Tumasyan, A.
AU - Adam, W.
AU - Andrejkovic, J. W.
AU - Bergauer, T.
AU - Chatterjee, S.
AU - Damanakis, K.
AU - Dragicevic, M.
AU - Escalante Del Valle, A.
AU - Hussain, P. S.
AU - Jeitler, M.
AU - Krammer, N.
AU - Liko, D.
AU - Mikulec, I.
AU - Schieck, J.
AU - Schöfbeck, R.
AU - Schwarz, D.
AU - Sonawane, M.
AU - Templ, S.
AU - Waltenberger, W.
AU - Wulz, C. E.
AU - Darwish, M. R.
AU - Janssen, T.
AU - Van Mechelen, P.
AU - Bols, E. S.
AU - D’Hondt, J.
AU - Dansana, S.
AU - De Moor, A.
AU - Delcourt, M.
AU - El Faham, H.
AU - Lowette, S.
AU - Makarenko, I.
AU - Müller, D.
AU - Sahasransu, A. R.
AU - Tavernier, S.
AU - Tytgat, M.
AU - Van Putte, S.
AU - Vannerom, D.
AU - Clerbaux, B.
AU - De Lentdecker, G.
AU - Favart, L.
AU - Hohov, D.
AU - Jaramillo, J.
AU - Khalilzadeh, A.
AU - Lee, K.
AU - Mahdavikhorrami, M.
AU - Malara, A.
AU - Paredes, S.
AU - Pétré, L.
AU - Strautnieks, Normunds Ralfs
N1 - Publisher Copyright:
© 2024, The Author(s).
PY - 2024/1
Y1 - 2024/1
N2 - 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.].
AB - 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.].
KW - Hadron-Hadron Scattering
KW - Tau Physics
UR - https://link.springer.com/article/10.1007/JHEP01(2024)101
UR - https://www.scopus.com/pages/publications/85185595948
U2 - 10.1007/JHEP01(2024)101
DO - 10.1007/JHEP01(2024)101
M3 - Article
SN - 1029-8479
VL - 2024
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
IS - 1
M1 - 101
ER -