Measurement of the τ lepton polarization in Z boson decays in proton-proton collisions at √s=13 TeV

Measurement of the τ lepton polarization in Z boson decays in proton-proton collisions at √s=13 TeV

The polarization of tau leptons is measured using leptonic and hadronic tau lepton decays in Z -> tau(+)tau(-) events in proton-proton collisions at root s = 13 TeV recorded by CMS at the CERN LHC with an integrated luminosity of 36.3 fb(-1). The measured tau(-) lepton polarization at the Z boson...

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Hauptverfasser: Chatterjee, S, El Faham, H, Benecke, A, De Souza, S. Fonseca, Pereira, A. Vilela, Pavlov, B, Li, Q, Fraga, J, Brigljevic, V, Mousa, J, Pata, J, Andrea, J, Goerlach, U, Beauceron, S, Chanon, N, Eliseev, D, Mukherjee, S, Brunner, D, Lange, W, Lipka, K, Mussgiller, A, Albrecht, S, Keicher, P, Assiouras, P, Papadopoulos, A, Panagiotou, A, Chatzistavrou, T, Mandal, K, Cavallo, F. R, Primavera, F, Latino, G, Boldrini, G, Dini, P, Lucchini, M. T, Fabozzi, F, Paolucci, P, Azzurri, P, Bhattacharya, R, Boccali, T, Ligabue, F, Chowdhury, S. Roy, Organtini, G, Covarelli, R, Moon, C. S, Park, J, Park, S. K, Jang, W, Leon Coello, M, Bunkowski, K, Bedoya, Cristina F, Goy Lopez, S, Liyanage, K, Barney, D, Caillol, C, David, A, Mannelli, M, Mulders, M, Lustermann, W, Macchiolo, A, Takahashi, Y, Yu, S. S, Hsu, T. H, Zorbilmez, C, Levchuk, L, Shepherd-Themistocleous, C. H, Dauncey, P, Fedi, G, Dominguez, A, Albert, A, Arcaro, D, Salyer, K, Luo, J, Jensen, F, Kukral, O, Schmitz, R, Xie, S, Apollinari, G, Lipton, R, Papadimitriou, V, Konigsberg, J, Shi, K, Salvatico, R, Hadley, N. J, Mignerey, A. C, Mans, J, Revering, M, Rusack, R, Alverson, G, Madigan, G, Ornelas, M. Nunez, Barnes, V. E, Yigitbasi, E, Lath, A, Wang, H, Aebi, D, Velkovska, J, Koraka, C. K, Azarkin, M, Babaev, A, Radchenko, O
Format: Artikel
Sprache:eng
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Hadron-Hadron Scattering
Physics and Astronomy
Tau Physics
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Zusammenfassung:The polarization of tau leptons is measured using leptonic and hadronic tau lepton decays in Z -> tau(+)tau(-) events in proton-proton collisions at root s = 13 TeV recorded by CMS at the CERN LHC with an integrated luminosity of 36.3 fb(-1). The measured tau(-) lepton polarization at the Z boson mass pole is P-tau(Z) = -0.144 +/- 0.006 (stat) +/- 0.014 (syst) = -0.144 +/- 0.015, in good agreement with the measurement of the tau lepton asymmetry parameter of A(tau) = 0.1439 +/- 0.0043 = -P-tau(Z) at LEP. The tau lepton polarization depends on the ratio of the vector to axial-vector couplings of the tau leptons in the neutral current expression, and thus on the effective weak mixing angle sin(2)theta(eff)(W), independently of the Z boson production mechanism. The obtained value sin(2)theta(eff)(W) = 0.2319 +/- 0.0008(stat) +/- 0.0018(syst) = 0.2319 +/- 0.0019 is in good agreement with measurements at e(+)e(-) colliders.
ISSN:1029-8479