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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], https://arxiv.org/abs/2309.12408. It has not been certified by peer review. |
URI: | https://bura.brunel.ac.uk/handle/2438/28768 |
DOI: | https://doi.org/10.1007/JHEP01(2024)101 |
ISSN: | 1126-6708 |
Other Identifiers: | ORCiD: A. Tumasyan https://orcid.org/0009-0000-0684-6742 ORCiD: Joanne E. Cole https://orcid.org/0000-0001-5638-7599 ORCiD: Akram Khan https://orcid.org/0000-0002-4597-4402 ORCiD: Paul Kyberd https://orcid.org/0000-0002-7353-7090 ORCiD: Ivan D. Reid https://orcid.org/0000-0002-9235-779X 101 |
Appears in Collections: | Dept of Electronic and Electrical Engineering Research Papers |
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