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Measurement of the polarisation of W bosons produced in top-quark decays using dilepton events at t √s = 13 TeV with the ATLAS experiment
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ATLAS Collaboration (Including: Becker, K., Guilloton, E., Harrison, P. F., Jones, E., Kerridge, B., Martin, T. A., Mitra, A., Morgenstern, S., Murray, W. J., Pollard, C. S., Roberts, B. A. and Vladimirov, V. E.). (2023) Measurement of the polarisation of W bosons produced in top-quark decays using dilepton events at t √s = 13 TeV with the ATLAS experiment. Physics Letters B, 843 . 137829. doi:10.1016/j.physletb.2023.137829 ISSN 0370-2693.
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Official URL: https://doi.org/10.1016/j.physletb.2023.137829
Abstract
A measurement of the polarisation of W bosons produced in top-quark decays is presented, using proton–proton collision data at a centre-of-mass energy of √s = 13 TeV. The data were collected by the ATLAS detector at the Large Hadron Collider and correspond to an integrated luminosity of 139 fb−1.The measurement is performed selecting tt¯ events decaying into final states with two charged leptons
(electrons or muons) and at least two b-tagged jets. The polarisation is extracted from the differentialcross-section distribution of the cos θ ∗ variable, where θ ∗ is the angle between the momentum direction
of the charged lepton from the W boson decay and the reversed momentum direction of the b-quark from the top-quark decay, both calculated in the W boson rest frame. Parton-level results, corrected
for the detector acceptance and resolution, are presented for the cos θ ∗ angle. The measured fractions of longitudinal, left- and right-handed polarisation states are found to be f0 = 0.684 ± 0.005 (stat.) ±
0.014 (syst.), fL = 0.318 ± 0.003 (stat.) ± 0.008 (syst.) and fR = −0.002 ± 0.002 (stat.) ± 0.014 (syst.), in agreement with the Standard Model prediction.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Journal or Publication Title: | Physics Letters B | ||||||||
Publisher: | Elsevier Science BV | ||||||||
ISSN: | 0370-2693 | ||||||||
Official Date: | 10 August 2023 | ||||||||
Dates: |
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Volume: | 843 | ||||||||
Article Number: | 137829 | ||||||||
DOI: | 10.1016/j.physletb.2023.137829 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||
Date of first compliant deposit: | 11 September 2023 | ||||||||
Date of first compliant Open Access: | 11 September 2023 |
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