Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV

The ATLAS collaboration; The CMS collaboration

doi:10.1007/JHEP08(2020)051

Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV

The ATLAS collaboration
, The CMS collaboration

Department of Physics

Universidad Nacional de Colombia
National University of Science and Technology POLITEHNICA Bucharest
iThemba Labs
Department of Physics
University of South Africa
Cadi Ayyad University
Departamento de Física and CEFITEC of Faculdade de Ciências e Tecnologia
NOVA University Lisbon
Instituto de Alta Investigación
Universidad de Tarapacá
CERN
University of Trento
L'Institut National de Physique Nucléaire et de Physique des Particules (IN2P3)
University of Oklahoma
University of Massachusetts
University of Göttingen
Royal Holloway University of London
University of Toronto
University of Copenhagen
University of Sussex
Tel Aviv University
Technion-Israel Institute of Technology
Argonne National Laboratory
National Institute for Nuclear Physics
Abdus Salam International Centre for Theoretical Physics
King's College London
Johannes Gutenberg University Mainz
Université Grenoble Alpes
AGH University of Krakow
Northern Illinois University
Ludwig Maximilian University of Munich
Bogazici University
University of Geneva
Rutherford Appleton Laboratory
University of California at Santa Cruz
Université Paris-Saclay
Université Clermont Auvergne
Radboud University Nijmegen
Alexandru Ioan Cuza University of Iaşi
Laboratório de Instrumentação e Física Experimental de Partículas
University of Granada
IFT-UAM/CSIC
Joint Institute for Nuclear Research
McGill University
Lawrence Berkeley National Laboratory
University of Rome Tor Vergata
Kyoto University
Lund University
RAS - P.N. Lebedev Physics Institute
University of Bologna
University of Victoria BC
Horia Hulubei National Institute of Physics and Nuclear Engineering
National Technical University of Athens
University of Amsterdam

Research output: Contribution to journal › Article › peer-review

40 Scopus citations

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 (F_L), or right-handed (F_R) polarizations. The resulting combined measurements of the polarization fractions are F₀ = 0.693 ± 0.014 and F_L = 0.315 ± 0.011. The fraction F_R is calculated from the unitarity constraint to be F_R = −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 (F_L) with respect to the most precise single measurement. A limit on anomalous right-handed vector (V_R), and left- and right-handed tensor (g_L, g_R) tWb couplings is set while fixing all others to their standard model values. The allowed regions are [−0.11, 0.16] for V_R, [−0.08, 0.05] for g_L, and [−0.04, 0.02] for g_R, at 95% confidence level. Limits on the corresponding Wilson coefficients are also derived. [Figure not available: see fulltext.]

Original language	English
Article number	51
Journal	Journal of High Energy Physics
Volume	2020
Issue number	8
DOIs	https://doi.org/10.1007/JHEP08(2020)051
State	Published - 1 Aug 2020

Keywords

Hadron-Hadron scattering (experiments)
Top physics

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10.1007/JHEP08(2020)051

Cite this

@article{d2af0fafbe104379bffb919168b9400a,

title = "Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV",

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. [Figure not available: see fulltext.]",

keywords = "Hadron-Hadron scattering (experiments), Top physics",

author = "\{The ATLAS collaboration\} and \{The CMS collaboration\} and G. Aad and B. Abbott and Abbott, \{D. C.\} and \{Abed Abud\}, A. and K. Abeling and Abhayasinghe, \{D. K.\} and Abidi, \{S. H.\} and \{Abou Zeid\}, \{O. S.\} and Abraham, \{N. L.\} and H. Abramowicz and H. Abreu and Y. Abulaiti and Acharya, \{B. S.\} and B. Achkar and L. Adam and \{Adam Bourdarios\}, C. and L. Adamczyk and L. Adamek and J. Adelman and M. Adersberger and A. Adiguzel and S. Adorni and T. Adye and Affolder, \{A. A.\} and Y. Afik and C. Agapopoulou and Agaras, \{M. N.\} and A. Aggarwal and C. Agheorghiesei and Aguilar-Saavedra, \{J. A.\} and A. Ahmad and F. Ahmadov and Ahmed, \{W. S.\} and X. Ai and G. Aielli and S. Akatsuka and {\AA}kesson, \{T. P.A.\} and E. Akilli and Akimov, \{A. V.\} and K. AlKhoury and Alberghi, \{G. L.\} and J. Albert and \{Alconada Verzini\}, \{M. J.\} and S. Alderweireldt and M. Aleksa and Aleksandrov, \{I. N.\} and C. Alexa and T. Alexopoulos and A. Alfonsi and Lee, \{J. S.H.\}",

note = "Publisher Copyright: {\textcopyright} 2020, The Author(s).",

year = "2020",

month = aug,

day = "1",

doi = "10.1007/JHEP08(2020)051",

language = "English",

volume = "2020",

journal = "Journal of High Energy Physics",

issn = "1029-8479",

publisher = "Springer Verlag",

number = "8",

}

TY - JOUR

T1 - Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV

AU - The ATLAS collaboration

AU - The CMS collaboration

AU - Aad, G.

AU - Abbott, B.

AU - Abbott, D. C.

AU - Abed Abud, A.

AU - Abeling, K.

AU - Abhayasinghe, D. K.

AU - Abidi, S. H.

AU - Abou Zeid, O. S.

AU - Abraham, N. L.

AU - Abramowicz, H.

AU - Abreu, H.

AU - Abulaiti, Y.

AU - Acharya, B. S.

AU - Achkar, B.

AU - Adam, L.

AU - Adam Bourdarios, C.

AU - Adamczyk, L.

AU - Adamek, L.

AU - Adelman, J.

AU - Adersberger, M.

AU - Adiguzel, A.

AU - Adorni, S.

AU - Adye, T.

AU - Affolder, A. A.

AU - Afik, Y.

AU - Agapopoulou, C.

AU - Agaras, M. N.

AU - Aggarwal, A.

AU - Agheorghiesei, C.

AU - Aguilar-Saavedra, J. A.

AU - Ahmad, A.

AU - Ahmadov, F.

AU - Ahmed, W. S.

AU - Ai, X.

AU - Aielli, G.

AU - Akatsuka, S.

AU - Åkesson, T. P.A.

AU - Akilli, E.

AU - Akimov, A. V.

AU - AlKhoury, K.

AU - Alberghi, G. L.

AU - Albert, J.

AU - Alconada Verzini, M. J.

AU - Alderweireldt, S.

AU - Aleksa, M.

AU - Aleksandrov, I. N.

AU - Alexa, C.

AU - Alexopoulos, T.

AU - Alfonsi, A.

AU - Lee, J. S.H.

PY - 2020/8/1

Y1 - 2020/8/1

N2 - 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. [Figure not available: see fulltext.]

AB - 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. [Figure not available: see fulltext.]

KW - Hadron-Hadron scattering (experiments)

KW - Top physics

UR - https://www.scopus.com/pages/publications/85090035581

U2 - 10.1007/JHEP08(2020)051

DO - 10.1007/JHEP08(2020)051

M3 - Article

AN - SCOPUS:85090035581

SN - 1029-8479

VL - 2020

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 8

M1 - 51

ER -

Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV

Abstract

Keywords

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