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Title: Measurement of the τ lepton polarization in Z boson decays in proton-proton collisions at √s = 13 TeV
Authors: Tumasyan, A
Adam, W
Andrejkovic, JW
Bergauer, T
Chatterjee, S
Damanakis, K
Dragicevic, M
Escalante Del Valle, A
Hussain, PS
Jeitler, M
Krammer, N
De Moor, A
Delcourt, M
El Faham, H
Lowette, S
Makarenko, I
Müller, D
Sahasransu, AR
Tavernier, S
Tytgat, M
Van Putte, S
Vannerom, D
Clerbaux, B
De Lentdecker, G
Favart, L
Hohov, D
Jaramillo, J
Khalilzadeh, A
Lee, K
Mahdavikhorrami, M
Malara, A
Paredes, S
Pétré, L
Postiau, N
Thomas, L
Vanden Bemden, M
Vander Velde, C
Vanlaer, P
De Coen, M
Dobur, D
Hong, Y
Knolle, J
Lambrecht, L
Mestdach, G
Rendón, C
Samalan, A
Skovpen, K
Van Den Bossche, N
Wezenbeek, L
Benecke, A
Bruno, G
Caputo, C
Delaere, C
Donertas, IS
Giammanco, A
Jaffel, K
Jain, S
Lemaitre, V
Lidrych, J
Mastrapasqua, P
Mondal, K
Tran, TT
Wertz, S
Alves, GA
Coelho, E
Hensel, C
Menezes De Oliveira, T
Moraes, A
Rebello Teles, P
Soeiro, M
Aldá Júnior, WL
Alves Gallo Pereira, M
Barroso Ferreira Filho, M
Brandao Malbouisson, H
Carvalho, W
Chinellato, J
Da Costa, EM
Da Silveira, GG
De Jesus Damiao, D
Fonseca De Souza, S
Martins, J
Mora Herrera, C
Reid, ID
Mota Amarilo, K
Mundim, L
Kyberd, P
Coldham, K
Khan, A
Cole, JE
Liko, D
Mikulec, I
Schieck, J
Schöfbeck, R
Schwarz, D
Sonawane, M
Templ, S
Waltenberger, W
Wulz, CE
Darwish, MR
Janssen, T
Van Mechelen, P
Bols, ES
D’Hondt, J
Dansana, S
Keywords: hadron-hadron scattering;tau physics
Issue Date: 19-Jan-2024
Publisher: Springer Nature on behalf of SISSA
Citation: Hayrapetyan, A. et al. for the benefit of the CMS Collaboration (2024) 'Measurement of the τ lepton polarization in Z boson decays in proton-proton collisions at √s = 13 TeV', Journal of High Energy Physics, 2024 (1), 101, pp. 1 - 53. doi: 10.1007/JHEP01(2024)101.
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 √s = 13 TeV 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.].
Description: A preprint version of the article is available at arXiv:2309.12408v2 [hep-ex], It has not been certified by peer review.
ISSN: 1126-6708
Other Identifiers: ORCiD: A. Tumasyan
ORCiD: Joanne E. Cole
ORCiD: Akram Khan
ORCiD: Paul Kyberd
ORCiD: Ivan D. Reid
Appears in Collections:Dept of Electronic and Electrical Engineering Research Papers

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