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http://bura.brunel.ac.uk/handle/2438/21551
Title: | Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV |
Authors: | Aad, G Abbott, B Abbott, DC Abed Abud, A Abeling, K Abhayasinghe, DK Abidi, SH Abou Zeid, OS Abraham, NL Abramowicz, H Abreu, H Allaire, C Allbrooke, BMM Allen, BW Allport, PP Aloisio, A Alonso, F Alpigiani, C Alshehri, AA Alunno Camelia, E Alvarez Estevez, M Alviggi, MG Amaral Coutinho, Y Ambler, A Ambroz, L Amelung, C Amidei, D Amor Dos Santos, SP Zahid, S Amoroso, S Amrouche, CS An, F Anastopoulos, C Andari, N Andeen, T Anders, CF Teodorescu, L Anders, JK Andrean, SY Andreazza, A Andrei, V Anelli, CR Angelidakis, S Mackay, CK Angerami, A Anisenkov, AV Annovi, A Antel, C Anthony, MT Reid, ID Antipov, E Antonelli, M Antrim, DJA Anulli, F Mackay, CK Aoki, M Aparisi Pozo, JA Aparo, MA Kyberd, P Aperio Bella, L Araujo Ferraz, V Khan, A Araujo Pereira, R Hobson, PR Cole, JE Abulaiti, Y Acharya, BS Achkar, B Adam, L Adam Bourdarios, C Adamczyk, L Adamek, L Adelman, J Adersberger, M Adiguzel, A Adorni, S Adye, T Affolder, AA Afik, Y Agapopoulou, C Agaras, MN Aggarwal, A Agheorghiesei, C Aguilar-Saavedra, JA Ahmad, A Ahmadov, F Ahmed, WS Ai, X Aielli, G Akatsuka, S Åkesson, TPA Akilli, E Akimov, AV AlKhoury, K Alberghi, GL Albert, J Alconada Verzini, MJ Alderweireldt, S Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, A Alfonsi, F Alhroob, M Ali, B Ali, S Aliev, M Alimonti, G |
Keywords: | Hadron-Hadron scattering (experiments);Top physics |
Issue Date: | 12-Aug-2020 |
Publisher: | Springer |
Citation: | Aad, G., Abbott, B., Abbott, D.C. et al. Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at \( \sqrt{s} \) = 8 TeV. J. High Energ. Phys. 2020, 51 (2020) |
Abstract: | The combination of measurements of the W boson polarization in top quark decays performed by the ATLAS and CMS collaborations is presented. The measurements are based on proton-proton collision data produced at the LHC at a centre-of-mass energy of 8 TeV, and corresponding to an integrated luminosity of about 20 fb−1 for each experiment. The measurements used events containing one lepton and having different jet multiplicities in the final state. The results are quoted as fractions of W bosons with longitudinal (F0), left-handed (FL), or right-handed (FR) polarizations. The resulting combined measurements of the polarization fractions are F0 = 0.693 ± 0.014 and FL = 0.315 ± 0.011. The fraction FR is calculated from the unitarity constraint to be FR = −0.008 ± 0.007. These results are in agreement with the standard model predictions at next-to-next-to-leading order in perturbative quantum chromodynamics and represent an improvement in precision of 25 (29)% for F0 (FL) with respect to the most precise single measurement. A limit on anomalous right-handed vector (VR), and left- and right-handed tensor (gL, gR) tWb couplings is set while fixing all others to their standard model values. The allowed regions are [−0.11, 0.16] for VR, [−0.08, 0.05] for gL, and [−0.04, 0.02] for gR, at 95% confidence level. Limits on the corresponding Wilson coefficients are also derived. |
URI: | https://bura.brunel.ac.uk/handle/2438/21551 |
DOI: | https://doi.org/10.1007/JHEP08(2020)051 |
ISSN: | 1126-6708 1029-8479 |
Appears in Collections: | Dept of Electronic and Electrical Engineering Research Papers |
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