Speaker
Kazumasa OHKUMA
(Okayama University of Science)
Description
The most general analysis of top-bottom-W boson ($tbW$) interactions is performed based on an effective lagrangian constructed by dimension 6 effective operators invariant under $SU(3) \times SU(2) \times U(1)$ symmetry. Since the lagrangian includes four kinds of effective operators, four kinds of nonstandard couplings parameterizing contributions from those operators exist, which are generally complex numbers. We estimate constraints on those nonstandard couplings coming from current experimental data for top-decay processes. As a result, we find that those constraints are not so strong yet because cancellations occur among some of contributions from those nonstandard couplings.
This contribution is going to be presented based on Ref. [1] and its updated result.
[1] Z. Hioki and K. Ohkuma,
``Full analysis of general non-standard $tbW$ couplings,''
Phys. Lett. B752, 128 (2016) [arXiv:1511.03437 [hep-ph]].
Primary author
Kazumasa OHKUMA
(Okayama University of Science)
Co-authors
Dr
Akira Uejima
(Okayama University of Science)
Zenro Hioki
(University of Tokushima)
