Unparticle effects on top quark rare decays

TL;DR

This paper investigates how unparticle physics could enhance the rare flavor-changing neutral current decays of the top quark, potentially making them detectable beyond Standard Model predictions.

Contribution

It explores the parameter space where unparticle effects could significantly increase top quark FCNC decay rates beyond Standard Model expectations.

Findings

Identifies parameter regions with enhanced decay rates

Suggests potential observability at current experimental sensitivities

Provides constraints on unparticle parameters

Abstract

In this work we study the flavor changing neutral current(FCNC) decays of the top quark, $t\to c\gamma$ and $t\to c g$. The Standard Model, predictions for the branching ratios of these decays are about $\sim 5\times 10^{-14}$, and $\sim 1\times 10^{-12}$, respectively. The recent study presented by the ATLAS Collaboration gives a sensitivity on these branching ratios about $\sim 10^{-5}$ at $%95$ C.L. The parameter space of $\lambda$, $\Lambda$, and $d$ where the branching ratios of $t\to c\gamma$ and $t\to c g$ decays exceed these predictions is obtained.