Measurement of the W boson polarisation in tt¯tt¯ events from pp collisions at s√s = 8 TeV in the lepton + jets channel with ATLASCitation formats

  • External authors:
  • Sarah Barnes
  • Rafal Bielski
  • Brian Cox
  • Cinzia Da Via
  • Nick Dann
  • Giulio Forcolin
  • Alessandra Forti
  • Julia Iturbe Ponce
  • Xingguo Li
  • Stephen Marsden
  • Jiri Masik
  • Stephen Menary
  • Thomas Neep
  • Rustem Ospanov
  • Joleen Pater
  • Arnaud Pin
  • Darren Price
  • Yang Qin
  • John Raine
  • Rhys Roberts
  • Savanna Shaw
  • Lee Tomlinson
  • Stephen Watts
  • Fabian Wilk
  • Martin Woudstra
  • Terence Wyatt
  • The ATLAS Collaboration

Standard

Measurement of the W boson polarisation in tt¯tt¯ events from pp collisions at s√s = 8 TeV in the lepton + jets channel with ATLAS. / Barnes, Sarah; Bielski, Rafal; Cox, Brian; Da Via, Cinzia; Dann, Nick; Forcolin, Giulio; Forti, Alessandra; Iturbe Ponce, Julia; Li, Xingguo; Loebinger, Frederick; Marsden, Stephen; Masik, Jiri; Menary, Stephen; Munoz Sanchez, Francisca; Neep, Thomas; Oh, Alexander; Ospanov, Rustem; Pater, Joleen; Peters, Yvonne; Pilkington, Andrew; Pin, Arnaud; Price, Darren; Qin, Yang; Raine, John; Roberts, Rhys; Shaw, Savanna; Tomlinson, Lee; Watts, Stephen; Wilk, Fabian; Woudstra, Martin; Wyatt, Terence; The ATLAS Collaboration.

In: European Physical Journal C. Particles and Fields, Vol. 77, No. 264, 264, 26.04.2017.

Research output: Contribution to journalArticlepeer-review

Harvard

Barnes, S, Bielski, R, Cox, B, Da Via, C, Dann, N, Forcolin, G, Forti, A, Iturbe Ponce, J, Li, X, Loebinger, F, Marsden, S, Masik, J, Menary, S, Munoz Sanchez, F, Neep, T, Oh, A, Ospanov, R, Pater, J, Peters, Y, Pilkington, A, Pin, A, Price, D, Qin, Y, Raine, J, Roberts, R, Shaw, S, Tomlinson, L, Watts, S, Wilk, F, Woudstra, M, Wyatt, T & The ATLAS Collaboration 2017, 'Measurement of the W boson polarisation in tt¯tt¯ events from pp collisions at s√s = 8 TeV in the lepton + jets channel with ATLAS', European Physical Journal C. Particles and Fields, vol. 77, no. 264, 264. https://doi.org/10.1140/epjc/s10052-017-4819-4

APA

Barnes, S., Bielski, R., Cox, B., Da Via, C., Dann, N., Forcolin, G., Forti, A., Iturbe Ponce, J., Li, X., Loebinger, F., Marsden, S., Masik, J., Menary, S., Munoz Sanchez, F., Neep, T., Oh, A., Ospanov, R., Pater, J., Peters, Y., ... The ATLAS Collaboration (2017). Measurement of the W boson polarisation in tt¯tt¯ events from pp collisions at s√s = 8 TeV in the lepton + jets channel with ATLAS. European Physical Journal C. Particles and Fields, 77(264), [264]. https://doi.org/10.1140/epjc/s10052-017-4819-4

Vancouver

Barnes S, Bielski R, Cox B, Da Via C, Dann N, Forcolin G et al. Measurement of the W boson polarisation in tt¯tt¯ events from pp collisions at s√s = 8 TeV in the lepton + jets channel with ATLAS. European Physical Journal C. Particles and Fields. 2017 Apr 26;77(264). 264. https://doi.org/10.1140/epjc/s10052-017-4819-4

Author

Barnes, Sarah ; Bielski, Rafal ; Cox, Brian ; Da Via, Cinzia ; Dann, Nick ; Forcolin, Giulio ; Forti, Alessandra ; Iturbe Ponce, Julia ; Li, Xingguo ; Loebinger, Frederick ; Marsden, Stephen ; Masik, Jiri ; Menary, Stephen ; Munoz Sanchez, Francisca ; Neep, Thomas ; Oh, Alexander ; Ospanov, Rustem ; Pater, Joleen ; Peters, Yvonne ; Pilkington, Andrew ; Pin, Arnaud ; Price, Darren ; Qin, Yang ; Raine, John ; Roberts, Rhys ; Shaw, Savanna ; Tomlinson, Lee ; Watts, Stephen ; Wilk, Fabian ; Woudstra, Martin ; Wyatt, Terence ; The ATLAS Collaboration. / Measurement of the W boson polarisation in tt¯tt¯ events from pp collisions at s√s = 8 TeV in the lepton + jets channel with ATLAS. In: European Physical Journal C. Particles and Fields. 2017 ; Vol. 77, No. 264.

Bibtex

@article{3dc982fa8ff14fd98b95b187746e728f,
title = "Measurement of the W boson polarisation in tt¯tt¯ events from pp collisions at s√s = 8 TeV in the lepton + jets channel with ATLAS",
abstract = "This paper presents a measurement of the polarisation of W bosons from tt¯tt¯ decays, reconstructed in events with one high- p T p T lepton and at least four jets. Data from pp collisions at the LHC were collected at s√s = 8 TeV and correspond to an integrated luminosity of 20.2 fb −1−1 . The angle θ∗θ∗ between the b-quark from the top quark decay and a direct W boson decay product in the W boson rest frame is sensitive to the W boson polarisation. Two different W decay products are used as polarisation analysers: the charged lepton and the down-type quark for the leptonically and hadronically decaying W boson, respectively. The most precise measurement of the W boson polarisation via the distribution of cosθ∗cos⁡θ∗ is obtained using the leptonic analyser and events in which at least two of the jets are tagged as b-quark jets. The fitted fractions of longitudinal, left- and right-handed polarisation states are F0= 0.709 ± 0.019F0= 0.709 ± 0.019 , FL= 0.299 ± 0.015FL= 0.299 ± 0.015 and FR= −0.008 ± 0.014FR= −0.008 ± 0.014 , and are the most precisely measured W boson polarisation fractions to date. Limits on anomalous couplings of the Wtb vertex are set.",
author = "Sarah Barnes and Rafal Bielski and Brian Cox and {Da Via}, Cinzia and Nick Dann and Giulio Forcolin and Alessandra Forti and {Iturbe Ponce}, Julia and Xingguo Li and Frederick Loebinger and Stephen Marsden and Jiri Masik and Stephen Menary and {Munoz Sanchez}, Francisca and Thomas Neep and Alexander Oh and Rustem Ospanov and Joleen Pater and Yvonne Peters and Andrew Pilkington and Arnaud Pin and Darren Price and Yang Qin and John Raine and Rhys Roberts and Savanna Shaw and Lee Tomlinson and Stephen Watts and Fabian Wilk and Martin Woudstra and Terence Wyatt and {The ATLAS Collaboration}",
year = "2017",
month = apr,
day = "26",
doi = "10.1140/epjc/s10052-017-4819-4",
language = "English",
volume = "77",
journal = "European Physical Journal C. Particles and Fields",
issn = "1434-6044",
publisher = "Springer Nature",
number = "264",

}

RIS

TY - JOUR

T1 - Measurement of the W boson polarisation in tt¯tt¯ events from pp collisions at s√s = 8 TeV in the lepton + jets channel with ATLAS

AU - Barnes, Sarah

AU - Bielski, Rafal

AU - Cox, Brian

AU - Da Via, Cinzia

AU - Dann, Nick

AU - Forcolin, Giulio

AU - Forti, Alessandra

AU - Iturbe Ponce, Julia

AU - Li, Xingguo

AU - Loebinger, Frederick

AU - Marsden, Stephen

AU - Masik, Jiri

AU - Menary, Stephen

AU - Munoz Sanchez, Francisca

AU - Neep, Thomas

AU - Oh, Alexander

AU - Ospanov, Rustem

AU - Pater, Joleen

AU - Peters, Yvonne

AU - Pilkington, Andrew

AU - Pin, Arnaud

AU - Price, Darren

AU - Qin, Yang

AU - Raine, John

AU - Roberts, Rhys

AU - Shaw, Savanna

AU - Tomlinson, Lee

AU - Watts, Stephen

AU - Wilk, Fabian

AU - Woudstra, Martin

AU - Wyatt, Terence

AU - The ATLAS Collaboration,

PY - 2017/4/26

Y1 - 2017/4/26

N2 - This paper presents a measurement of the polarisation of W bosons from tt¯tt¯ decays, reconstructed in events with one high- p T p T lepton and at least four jets. Data from pp collisions at the LHC were collected at s√s = 8 TeV and correspond to an integrated luminosity of 20.2 fb −1−1 . The angle θ∗θ∗ between the b-quark from the top quark decay and a direct W boson decay product in the W boson rest frame is sensitive to the W boson polarisation. Two different W decay products are used as polarisation analysers: the charged lepton and the down-type quark for the leptonically and hadronically decaying W boson, respectively. The most precise measurement of the W boson polarisation via the distribution of cosθ∗cos⁡θ∗ is obtained using the leptonic analyser and events in which at least two of the jets are tagged as b-quark jets. The fitted fractions of longitudinal, left- and right-handed polarisation states are F0= 0.709 ± 0.019F0= 0.709 ± 0.019 , FL= 0.299 ± 0.015FL= 0.299 ± 0.015 and FR= −0.008 ± 0.014FR= −0.008 ± 0.014 , and are the most precisely measured W boson polarisation fractions to date. Limits on anomalous couplings of the Wtb vertex are set.

AB - This paper presents a measurement of the polarisation of W bosons from tt¯tt¯ decays, reconstructed in events with one high- p T p T lepton and at least four jets. Data from pp collisions at the LHC were collected at s√s = 8 TeV and correspond to an integrated luminosity of 20.2 fb −1−1 . The angle θ∗θ∗ between the b-quark from the top quark decay and a direct W boson decay product in the W boson rest frame is sensitive to the W boson polarisation. Two different W decay products are used as polarisation analysers: the charged lepton and the down-type quark for the leptonically and hadronically decaying W boson, respectively. The most precise measurement of the W boson polarisation via the distribution of cosθ∗cos⁡θ∗ is obtained using the leptonic analyser and events in which at least two of the jets are tagged as b-quark jets. The fitted fractions of longitudinal, left- and right-handed polarisation states are F0= 0.709 ± 0.019F0= 0.709 ± 0.019 , FL= 0.299 ± 0.015FL= 0.299 ± 0.015 and FR= −0.008 ± 0.014FR= −0.008 ± 0.014 , and are the most precisely measured W boson polarisation fractions to date. Limits on anomalous couplings of the Wtb vertex are set.

U2 - 10.1140/epjc/s10052-017-4819-4

DO - 10.1140/epjc/s10052-017-4819-4

M3 - Article

VL - 77

JO - European Physical Journal C. Particles and Fields

JF - European Physical Journal C. Particles and Fields

SN - 1434-6044

IS - 264

M1 - 264

ER -