Direct observation of longitudinally polarised W±bosons

L3 Collaboration

doi:10.1016/S0370-2693(99)01489-6

Direct observation of longitudinally polarised W±bosons

L3 Collaboration

Physics

National Institute for Nuclear Physics
University of Geneva
University of Florence
CIEMAT
University of Lausanne
CERN
Swiss Federal Institute of Technology Zurich
Louisiana State University
Nuclear Physics Institute
University of Bucharest
University of Bologna
Alikhanov Institute for Theoretical and Experimental Physics
University of Michigan, Ann Arbor
Tata Institute of Fundamental Research
University of Rome La Sapienza
University of Alabama
IN2P3-CNRS
Paul Scherrer Institute
University of Perugia
Massachusetts Institute of Technology
Carnegie Mellon University
University of Amsterdam
RWTH Aachen University
Hungarian Academy of Sciences

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

9 Scopus citations

Abstract

The three different helicity states of W ± bosons, produced in the reaction e+ e^- → W⁺W^- →lvqq̄ are studied using leptonic and hadronic W decays at √s = 183 GeV and 189 GeV. The W polarisation is also measured as a function of the scattering angle between the W^- and the direction of the e^- beam. The analysis demonstrates that W bosons are produced with all three helicities, the longitudinal and the two transverse states. Combining the results from the two center-of-mass energies and with leptonic and hadronic W decays, the fraction of longitudinally polarised W(±) bosons is measured to be 0.261 ± 0.051(stat.) ± 0.016(syst.) in agreement with the expectation from the Standard Model.

Original language	English
Pages (from-to)	194-204
Number of pages	11
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	474
Issue number	1-2
DOIs	https://doi.org/10.1016/S0370-2693(99)01489-6
State	Published - Feb 10 2000

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10.1016/S0370-2693(99)01489-6

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@article{6e5aae41edae4b6cb112e871e3510f5c,

title = "Direct observation of longitudinally polarised W±bosons",

abstract = "The three different helicity states of W ± bosons, produced in the reaction e+ e- → W+W- →lvq{\=q} are studied using leptonic and hadronic W decays at √s = 183 GeV and 189 GeV. The W polarisation is also measured as a function of the scattering angle between the W- and the direction of the e- beam. The analysis demonstrates that W bosons are produced with all three helicities, the longitudinal and the two transverse states. Combining the results from the two center-of-mass energies and with leptonic and hadronic W decays, the fraction of longitudinally polarised W(±) bosons is measured to be 0.261 ± 0.051(stat.) ± 0.016(syst.) in agreement with the expectation from the Standard Model.",

author = "\{L3 Collaboration\} and M. Acciarri and P. Achard and O. Adriani and M. Aguilar-Benitez and J. Alcaraz and G. Alemanni and J. Allaby and A. Aloisio and Alviggi, \{M. G.\} and G. Ambrosi and H. Anderhub and Andreev, \{V. P.\} and T. Angelescu and F. Anselmo and A. Arefiev and T. Azemoon and T. Aziz and P. Bagnaia and L. Baksay and A. Balandras and Ball, \{R. C.\} and S. Banerjee and Sw Banerjee and A. Barczyk and R. Barillere and L. Barone and P. Bartalini and M. Basile and R. Battiston and A. Bay and F. Becattini and U. Becker and F. Behner and L. Bellucci and J. Berdugo and P. Berges and B. Bertucci and Betev, \{B. L.\} and S. Bhattacharya and M. Biasini and A. Biland and Blaising, \{J. J.\} and Blyth, \{S. C.\} and Bobbink, \{G. J.\} and A. Bohm and L. Boldizsar and B. Borgia and D. Bourilkov and M. Bourquin and I. Iashvili",

year = "2000",

month = feb,

day = "10",

doi = "10.1016/S0370-2693(99)01489-6",

language = "English",

volume = "474",

pages = "194--204",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

number = "1-2",

}

TY - JOUR

T1 - Direct observation of longitudinally polarised W±bosons

AU - L3 Collaboration

AU - Acciarri, M.

AU - Achard, P.

AU - Adriani, O.

AU - Aguilar-Benitez, M.

AU - Alcaraz, J.

AU - Alemanni, G.

AU - Allaby, J.

AU - Aloisio, A.

AU - Alviggi, M. G.

AU - Ambrosi, G.

AU - Anderhub, H.

AU - Andreev, V. P.

AU - Angelescu, T.

AU - Anselmo, F.

AU - Arefiev, A.

AU - Azemoon, T.

AU - Aziz, T.

AU - Bagnaia, P.

AU - Baksay, L.

AU - Balandras, A.

AU - Ball, R. C.

AU - Banerjee, S.

AU - Banerjee, Sw

AU - Barczyk, A.

AU - Barillere, R.

AU - Barone, L.

AU - Bartalini, P.

AU - Basile, M.

AU - Battiston, R.

AU - Bay, A.

AU - Becattini, F.

AU - Becker, U.

AU - Behner, F.

AU - Bellucci, L.

AU - Berdugo, J.

AU - Berges, P.

AU - Bertucci, B.

AU - Betev, B. L.

AU - Bhattacharya, S.

AU - Biasini, M.

AU - Biland, A.

AU - Blaising, J. J.

AU - Blyth, S. C.

AU - Bobbink, G. J.

AU - Bohm, A.

AU - Boldizsar, L.

AU - Borgia, B.

AU - Bourilkov, D.

AU - Bourquin, M.

AU - Iashvili, I.

PY - 2000/2/10

Y1 - 2000/2/10

N2 - The three different helicity states of W ± bosons, produced in the reaction e+ e- → W+W- →lvqq̄ are studied using leptonic and hadronic W decays at √s = 183 GeV and 189 GeV. The W polarisation is also measured as a function of the scattering angle between the W- and the direction of the e- beam. The analysis demonstrates that W bosons are produced with all three helicities, the longitudinal and the two transverse states. Combining the results from the two center-of-mass energies and with leptonic and hadronic W decays, the fraction of longitudinally polarised W(±) bosons is measured to be 0.261 ± 0.051(stat.) ± 0.016(syst.) in agreement with the expectation from the Standard Model.

AB - The three different helicity states of W ± bosons, produced in the reaction e+ e- → W+W- →lvqq̄ are studied using leptonic and hadronic W decays at √s = 183 GeV and 189 GeV. The W polarisation is also measured as a function of the scattering angle between the W- and the direction of the e- beam. The analysis demonstrates that W bosons are produced with all three helicities, the longitudinal and the two transverse states. Combining the results from the two center-of-mass energies and with leptonic and hadronic W decays, the fraction of longitudinally polarised W(±) bosons is measured to be 0.261 ± 0.051(stat.) ± 0.016(syst.) in agreement with the expectation from the Standard Model.

UR - https://www.scopus.com/pages/publications/0034628397

U2 - 10.1016/S0370-2693(99)01489-6

DO - 10.1016/S0370-2693(99)01489-6

M3 - Article

AN - SCOPUS:0034628397

SN - 0370-2693

VL - 474

SP - 194

EP - 204

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 1-2

ER -

Direct observation of longitudinally polarised W±bosons

Abstract

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