New Physics effects on hadronic decay asymmetries of the Top quark
F. Larios, M. A. Perez
TL;DR
This paper investigates how New Physics scenarios, such as anomalous right-handed couplings and a light W' boson, could significantly alter hadronic decay asymmetries of the top quark, which are zero in the Standard Model.
Contribution
It introduces a new CP-even asymmetry in top quark decays and explores how specific New Physics models can produce observable effects.
Findings
Anomalous right-handed tbW coupling can induce a 20% asymmetry.
A light W' boson with right-handed couplings can produce a similar asymmetry.
The asymmetry is zero in the Standard Model, making it a clear signal of New Physics.
Abstract
We study some New Physics effects on the hadronic decays of the Top quark, like t-> b bbar c, and on a forward-backward-like CP even asymmetry A_t constructed in such a way that it is zero in the SM. We find that an anomalous right-handed contribution of the effective tbW vertex may induce an asymmetry A_t of the order of 20 %. A light W' boson with pure right handed couplings tdW' may induce an asymmetry A_t of the same order of magnitude.
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