New directions for top quark polarization in the $t$-channel process

Abstract

We define three orthogonal axes to investigate the top quark polarization in the $t$-channel single top process. We provide expressions for the polarization in these axes in terms of anomalous $Wtb$ couplings. It is found that the polarizations in the two axes orthogonal to the spectator quark axis are very sensitive to an anomalous coupling involving a ${\bar{b}}_L{\sigma }^{\mu \nu }{t}_R$ dipole term. In particular, an asymmetry based on the polarization normal to the production plane is more sensitive to the imaginary part of this coupling than previously studied observables.

LaTeX 6 pages. Minor changes, matches published version

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• Analysis of the $Wtb$ vertex from the measurement of triple-differential angular decay rates of single top quarks produced in the $t$-channel at $\sqrt{s}$ = 8 TeV with the ATLAS detector
• Quantum coherence, top transverse polarisation and the Tevatron asymmetry $A_{FB}^{\ell }$
• Climbing to the Top of the ATLAS 13 TeV data
• Measurement of the polarisation of single top quarks and antiquarks produced in the $t$-channel at $\sqrt{s}=13$ TeV and bounds on the $tWb$ dipole operator from the ATLAS experiment
• NLO QCD and EW corrections to off-shell $\mathrm{tZj}$ production at the LHC
• Linear power corrections to single top production and decay at the LHC in the narrow width approximation
• Single-top quark physics at the LHC: from precision measurements to rare processes and top quark properties
• Top quark properties measurements at the LHC