Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

T -odd asymmetry in W+ jet events at the LHC

Frederix, Rikkert LU orcid ; Hagiwara, Kaoru ; Yamada, Toshifumi and Yokoya, Hiroshi (2014) In Physical Review Letters 113(15).
Abstract

W bosons produced at high transverse momentum in hadron collisions can have polarization along the direction perpendicular to the production plane, which is odd under naïve T reversal where both the three-momenta and angular momenta are reversed. Perturbative QCD predicts nonzero polarization at the one-loop level, which can be measured as parity-odd components in the angular distribution of charged leptons from the decay of W bosons. We perform a detector-level simulation with the generator MadGraph5-aMC@NLO, and demonstrate that the asymmetry can be observed at the 8 TeV LHC with 20fb-1 of data. If confirmed, it will be the first experimental measurement of the sign of the imaginary part of one-loop QCD amplitudes.

Please use this url to cite or link to this publication:
author
; ; and
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
113
issue
15
article number
152001
publisher
American Physical Society
external identifiers
  • scopus:84907855050
ISSN
0031-9007
DOI
10.1103/PhysRevLett.113.152001
language
English
LU publication?
no
id
a563b5c4-fd02-4cc6-8d0f-0832cab400cb
date added to LUP
2019-05-28 15:38:46
date last changed
2025-10-14 12:23:22
@article{a563b5c4-fd02-4cc6-8d0f-0832cab400cb,
  abstract     = {{<p>W bosons produced at high transverse momentum in hadron collisions can have polarization along the direction perpendicular to the production plane, which is odd under naïve T reversal where both the three-momenta and angular momenta are reversed. Perturbative QCD predicts nonzero polarization at the one-loop level, which can be measured as parity-odd components in the angular distribution of charged leptons from the decay of W bosons. We perform a detector-level simulation with the generator MadGraph5-aMC@NLO, and demonstrate that the asymmetry can be observed at the 8 TeV LHC with 20fb-1 of data. If confirmed, it will be the first experimental measurement of the sign of the imaginary part of one-loop QCD amplitudes.</p>}},
  author       = {{Frederix, Rikkert and Hagiwara, Kaoru and Yamada, Toshifumi and Yokoya, Hiroshi}},
  issn         = {{0031-9007}},
  language     = {{eng}},
  month        = {{10}},
  number       = {{15}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Letters}},
  title        = {{T -odd asymmetry in W+ jet events at the LHC}},
  url          = {{http://dx.doi.org/10.1103/PhysRevLett.113.152001}},
  doi          = {{10.1103/PhysRevLett.113.152001}},
  volume       = {{113}},
  year         = {{2014}},
}