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Measurement of Leptonic Asymmetries and Top Quark Polarization in ttbar Production

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Measurement of Leptonic Asymmetries and Top Quark Polarization in ttbar Production. / Collaboration, D0; Bertram, Iain; Borissov, Guennadi et al.
In: Physical Review D, Vol. 87, No. 1, 011103(R), 24.01.2013.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Collaboration, D, Bertram, I, Borissov, G, Fox, H, Ross, A, Williams, M & Ratoff, P 2013, 'Measurement of Leptonic Asymmetries and Top Quark Polarization in ttbar Production', Physical Review D, vol. 87, no. 1, 011103(R). https://doi.org/10.1103/PhysRevD.87.011103

APA

Collaboration, D., Bertram, I., Borissov, G., Fox, H., Ross, A., Williams, M., & Ratoff, P. (2013). Measurement of Leptonic Asymmetries and Top Quark Polarization in ttbar Production. Physical Review D, 87(1), Article 011103(R). https://doi.org/10.1103/PhysRevD.87.011103

Vancouver

Collaboration D, Bertram I, Borissov G, Fox H, Ross A, Williams M et al. Measurement of Leptonic Asymmetries and Top Quark Polarization in ttbar Production. Physical Review D. 2013 Jan 24;87(1):011103(R). doi: 10.1103/PhysRevD.87.011103

Author

Collaboration, D0 ; Bertram, Iain ; Borissov, Guennadi et al. / Measurement of Leptonic Asymmetries and Top Quark Polarization in ttbar Production. In: Physical Review D. 2013 ; Vol. 87, No. 1.

Bibtex

@article{93d0bad98a9d4401abb654f9b5c0d630,
title = "Measurement of Leptonic Asymmetries and Top Quark Polarization in ttbar Production",
abstract = "We present measurements of lepton (l) angular distributions in ttbar -> W+ b W- b -> l+ nu b l- nubar bbar decays produced in ppbar collisions at a center-of-mass energy of sqrt(s)=1.96TeV, where l is an electron or muon. Using data corresponding to an integrated luminosity of 5.4fb^-1, collected with the D0 detector at the Fermilab Collider, we find that the angular distributions of l- relative to anti-protons and l+ relative to protons are in agreement with each other. Combining the two distributions and correcting for detector acceptance we obtain the forward-backward asymmetry A^l_FB = (5.8 +- 5.1(stat) +- 1.3(syst))%, compared to the standard model prediction of A^l_FB (predicted) = (4.7 +- 0.1)%. This result is further combined with the measurement based on the analysis of the l+jets final state to obtain A^l_FB = (11.8 +- 3.2)%. Furthermore, we present a first study of the top-quark polarization.",
author = "D0 Collaboration and Iain Bertram and Guennadi Borissov and Harald Fox and Anthony Ross and Mark Williams and Peter Ratoff",
note = "{\textcopyright} 2013 American Physical Society",
year = "2013",
month = jan,
day = "24",
doi = "10.1103/PhysRevD.87.011103",
language = "English",
volume = "87",
journal = "Physical Review D",
issn = "1550-7998",
publisher = "American Physical Society",
number = "1",

}

RIS

TY - JOUR

T1 - Measurement of Leptonic Asymmetries and Top Quark Polarization in ttbar Production

AU - Collaboration, D0

AU - Bertram, Iain

AU - Borissov, Guennadi

AU - Fox, Harald

AU - Ross, Anthony

AU - Williams, Mark

AU - Ratoff, Peter

N1 - © 2013 American Physical Society

PY - 2013/1/24

Y1 - 2013/1/24

N2 - We present measurements of lepton (l) angular distributions in ttbar -> W+ b W- b -> l+ nu b l- nubar bbar decays produced in ppbar collisions at a center-of-mass energy of sqrt(s)=1.96TeV, where l is an electron or muon. Using data corresponding to an integrated luminosity of 5.4fb^-1, collected with the D0 detector at the Fermilab Collider, we find that the angular distributions of l- relative to anti-protons and l+ relative to protons are in agreement with each other. Combining the two distributions and correcting for detector acceptance we obtain the forward-backward asymmetry A^l_FB = (5.8 +- 5.1(stat) +- 1.3(syst))%, compared to the standard model prediction of A^l_FB (predicted) = (4.7 +- 0.1)%. This result is further combined with the measurement based on the analysis of the l+jets final state to obtain A^l_FB = (11.8 +- 3.2)%. Furthermore, we present a first study of the top-quark polarization.

AB - We present measurements of lepton (l) angular distributions in ttbar -> W+ b W- b -> l+ nu b l- nubar bbar decays produced in ppbar collisions at a center-of-mass energy of sqrt(s)=1.96TeV, where l is an electron or muon. Using data corresponding to an integrated luminosity of 5.4fb^-1, collected with the D0 detector at the Fermilab Collider, we find that the angular distributions of l- relative to anti-protons and l+ relative to protons are in agreement with each other. Combining the two distributions and correcting for detector acceptance we obtain the forward-backward asymmetry A^l_FB = (5.8 +- 5.1(stat) +- 1.3(syst))%, compared to the standard model prediction of A^l_FB (predicted) = (4.7 +- 0.1)%. This result is further combined with the measurement based on the analysis of the l+jets final state to obtain A^l_FB = (11.8 +- 3.2)%. Furthermore, we present a first study of the top-quark polarization.

U2 - 10.1103/PhysRevD.87.011103

DO - 10.1103/PhysRevD.87.011103

M3 - Journal article

VL - 87

JO - Physical Review D

JF - Physical Review D

SN - 1550-7998

IS - 1

M1 - 011103(R)

ER -