Measurement of the W boson polarization in top quark decays with the ATLAS detector

G. Aad; Mogens Dam; Jørgen Beck Hansen; Peter Henrik Hansen; Jørn Dines Hansen; John Renner Hansen; Nele Maria Philomena Boelaert; Sascha Mehlhase; Simon Johann Franz Heisterkamp; Morten Dam Jørgensen; Troels Christian Petersen; Esben Bryndt Klinkby; Björn Stefan Nilsson; Ask Emil Løvschall-Jensen; Stefania Xella

doi:10.1007/JHEP06(2012)088

Measurement of the W boson polarization in top quark decays with the ATLAS detector

G. Aad, Mogens Dam, Jørgen Beck Hansen, Peter Henrik Hansen, Jørn Dines Hansen, John Renner Hansen, Nele Maria Philomena Boelaert, Sascha Mehlhase, Simon Johann Franz Heisterkamp, Morten Dam Jørgensen, Troels Christian Petersen, Esben Bryndt Klinkby, Björn Stefan Nilsson, Ask Emil Løvschall-Jensen, Stefania Xella

50 Citations (Scopus)

Abstract

This paper presents measurements of the polarization ofW bosons in top quark decays, derived from tt̄ events with missing transverse momentum, one charged lepton and at least four jets, or two charged leptons and at least two jets. Data from pp collisions at a centre-of-mass energy of 7 TeV were collected with the ATLAS experiment at the LHC and correspond to an integrated luminosity of 1.04 fb^-1. The measured fractions of longitudinally, left- and right-handed polarization are F₀ = 0.67 ± 0.07, F_L = 0.32 ± 0.04 and F_R = 0.01 ± 0.05, in agreement with the Standard Model predictions. As the polarization of the W bosons in top quark decays is sensitive to the Wtb vertex Lorentz structure and couplings, the measurements were used to set limits on anomalous contributions to the Wtb couplings.

Original language	English
Journal	Journal of High Energy Physics (Online)
Volume	2012
Issue number	6
Pages (from-to)	088
ISSN	1126-6708
DOIs	https://doi.org/10.1007/JHEP06(2012)088
Publication status	Published - 12 Jun 2012

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Aad, G., Dam, M., Hansen, J. B., Hansen, P. H., Hansen, J. D., Hansen, J. R., Boelaert, N. M. P., Mehlhase, S., Heisterkamp, S. J. F., Jørgensen, M. D., Petersen, T. C., Klinkby, E. B., Nilsson, B. S., Løvschall-Jensen, A. E., & Xella, S. (2012). Measurement of the W boson polarization in top quark decays with the ATLAS detector. Journal of High Energy Physics (Online), 2012(6), 088. https://doi.org/10.1007/JHEP06(2012)088

Aad, G, Dam, M , Hansen, JB , Hansen, PH , Hansen, JD , Hansen, JR, Boelaert, NMP, Mehlhase, S, Heisterkamp, SJF, Jørgensen, MD, Petersen, TC, Klinkby, EB, Nilsson, BS, Løvschall-Jensen, AE & Xella, S 2012, 'Measurement of the W boson polarization in top quark decays with the ATLAS detector', Journal of High Energy Physics (Online), vol. 2012, no. 6, pp. 088. https://doi.org/10.1007/JHEP06(2012)088

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title = "Measurement of the W boson polarization in top quark decays with the ATLAS detector",

abstract = "This paper presents measurements of the polarization ofW bosons in top quark decays, derived from t{\=t} events with missing transverse momentum, one charged lepton and at least four jets, or two charged leptons and at least two jets. Data from pp collisions at a centre-of-mass energy of 7 TeV were collected with the ATLAS experiment at the LHC and correspond to an integrated luminosity of 1.04 fb-1. The measured fractions of longitudinally, left- and right-handed polarization are F0 = 0.67 ± 0.07, FL = 0.32 ± 0.04 and FR = 0.01 ± 0.05, in agreement with the Standard Model predictions. As the polarization of the W bosons in top quark decays is sensitive to the Wtb vertex Lorentz structure and couplings, the measurements were used to set limits on anomalous contributions to the Wtb couplings.",

author = "G. Aad and Mogens Dam and Hansen, {J{\o}rgen Beck} and Hansen, {Peter Henrik} and Hansen, {J{\o}rn Dines} and Hansen, {John Renner} and Boelaert, {Nele Maria Philomena} and Sascha Mehlhase and Heisterkamp, {Simon Johann Franz} and J{\o}rgensen, {Morten Dam} and Petersen, {Troels Christian} and Klinkby, {Esben Bryndt} and Nilsson, {Bj{\"o}rn Stefan} and L{\o}vschall-Jensen, {Ask Emil} and Stefania Xella",

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T1 - Measurement of the W boson polarization in top quark decays with the ATLAS detector

AU - Aad, G.

AU - Dam, Mogens

AU - Hansen, Jørgen Beck

AU - Hansen, Peter Henrik

AU - Hansen, Jørn Dines

AU - Hansen, John Renner

AU - Boelaert, Nele Maria Philomena

AU - Mehlhase, Sascha

AU - Heisterkamp, Simon Johann Franz

AU - Jørgensen, Morten Dam

AU - Petersen, Troels Christian

AU - Klinkby, Esben Bryndt

AU - Nilsson, Björn Stefan

AU - Løvschall-Jensen, Ask Emil

AU - Xella, Stefania

PY - 2012/6/12

Y1 - 2012/6/12

N2 - This paper presents measurements of the polarization ofW bosons in top quark decays, derived from tt̄ events with missing transverse momentum, one charged lepton and at least four jets, or two charged leptons and at least two jets. Data from pp collisions at a centre-of-mass energy of 7 TeV were collected with the ATLAS experiment at the LHC and correspond to an integrated luminosity of 1.04 fb-1. The measured fractions of longitudinally, left- and right-handed polarization are F0 = 0.67 ± 0.07, FL = 0.32 ± 0.04 and FR = 0.01 ± 0.05, in agreement with the Standard Model predictions. As the polarization of the W bosons in top quark decays is sensitive to the Wtb vertex Lorentz structure and couplings, the measurements were used to set limits on anomalous contributions to the Wtb couplings.

AB - This paper presents measurements of the polarization ofW bosons in top quark decays, derived from tt̄ events with missing transverse momentum, one charged lepton and at least four jets, or two charged leptons and at least two jets. Data from pp collisions at a centre-of-mass energy of 7 TeV were collected with the ATLAS experiment at the LHC and correspond to an integrated luminosity of 1.04 fb-1. The measured fractions of longitudinally, left- and right-handed polarization are F0 = 0.67 ± 0.07, FL = 0.32 ± 0.04 and FR = 0.01 ± 0.05, in agreement with the Standard Model predictions. As the polarization of the W bosons in top quark decays is sensitive to the Wtb vertex Lorentz structure and couplings, the measurements were used to set limits on anomalous contributions to the Wtb couplings.

U2 - 10.1007/JHEP06(2012)088

DO - 10.1007/JHEP06(2012)088

M3 - Journal article

SN - 1126-6708

VL - 2012

SP - 088

JO - Journal of High Energy Physics (Online)

JF - Journal of High Energy Physics (Online)

IS - 6

ER -

Measurement of the W boson polarization in top quark decays with the ATLAS detector

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