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Measurement of the polarisation of W bosons produced in top-quark decays using dilepton events at s=13 TeV with the ATLAS experiment
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Measurement of the polarisation of W bosons produced in top-quark decays using dilepton events at s=13 TeV with the ATLAS experiment

G. Aad, B. Abbott, D.C. Abbott, K. Abeling, S.H. Abidi, A. Aboulhorma, H. Abramowicz, H. Abreu, Y. Abulaiti, A.C. Abusleme Hoffman, …
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 卷.843, 137829
08/2023
DOI: https://doi.org/10.1016/j.physletb.2023.137829

摘要

Nuclear and High Energy Physics
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 differential cross-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 f 0 =0.684±0.005(stat.)±0.014(syst.), f L =0.318±0.003(stat.)±0.008(syst.) and f R =−0.002±0.002(stat.)±0.014(syst.), in agreement with the Standard Model prediction.

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