T-odd asymmetries in radiative top-quark decays

Abstract

We study the angular distribution of the charged lepton in the top-quark decay into a bottom quark and a W boson which subsequently decays into \ellν_{\ell}, when a hard gluon is radiated off. The absorptive part of the t \to bWg decay amplitudes, which gives rise to T-odd asymmetries in the distribution, is calculated at the one-loop level in perturbative QCD. The asymmetries at a few percent level are predicted, which may be observable at future colliders.

21 pages, 9 figures; discussions for the decay of polarized top-quarks added in a new chapter, references added, version to appear in JHEP

References in corpus (5)

• JaxoDraw: A graphical user interface for drawing Feynman diagrams
• Complete angular analysis of polarized top decay at O(alpha_s)
• Measurement of azimuthal asymmetries in neutral current deep inelastic scattering at HERA
• Parity-Odd Asymmetries in W-Jet Events at the Tevatron
• Single Longitudinal-Spin Asymmetries in Lepton-Pair Production at RHIC and J-PARC

Cited by in corpus (9)

• Better Higgs-CP Tests Through Information Geometry
• Higgs Physics: It ain't over till it's over
• The Top Quark Decay Vertex in Standard Model Extensions
• T-odd correlations from top-quark CEDM in lepton plus jets top-pair events
• Color-octet scalars and potentially large CP violation at the LHC
• Decays of polarized top quarks to lepton, neutrino and jets at NLO QCD
• Perturbative $T$-odd asymmetries in the Drell-Yan process revisited
• T-odd Asymmetry in W+jet Events at the LHC
• T-odd proton-helicity asymmetry in semi-inclusive DIS in perturbative QCD