3-10 August 2016
Chicago IL USA
US/Central timezone
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Constraints on anomalous couplings at the Wtb vertex from the measurement of triple differential angular decay rates of single top quarks produced in the t-channel with the ATLAS detector

Aug 8, 2016, 6:30 PM
Riverwalk A/B

Riverwalk A/B

Poster Top Quark and Electroweak Physics Poster Session


Jun Su (University of Pittsburgh (US))


The t-channel production and decay of single top quarks is a unique probe of the Wtb vertex, providing simultaneous sensitivity to all of the "anomalous couplings", V_L, V_R, g_L and g_R. These four effective anomalous couplings have a direct connection with dimension-six operators coefficients in the effective field theory framework. To obtain constraints in the space of these parameters the triple differential decay rate of semileptonic top-quark decays collected in 20.3 fb^{-1} of proton--proton collisions at \sqrt{s} = 8 TeV using the ATLAS detector. Detector effects (resolution and efficiency) are deconvolved from the observed signal using novel Fourier techniques in particular a higher dimensional variant of the ordinary convolution theorem. Constraints on the top-quark polarization and the imaginary part of the coupling constant g_R are the world's most precise.

Primary author

ATLAS Collaboration (CERN)

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