Apparent unitarity violation in top quark's mass off-shell region from a new physics at high energy colliders

TL;DR

This paper suggests that observing an apparent unitarity violation in the top quark's off-shell mass distribution at high energies could indirectly indicate new physics, such as a top quark partner, at colliders.

Contribution

It introduces the idea that apparent unitarity violations in off-shell top quark regions can serve as indirect signals of new physics beyond the Standard Model.

Findings

Potential to detect new physics via off-shell top quark distributions

Unitarity violation hints at top quark partner presence

Analysis applicable to high-energy collider data

Abstract

Perturbative unitarity conditions have been playing an important role by estimating the energy scale of new physics, including the Higgs mass as one of the most important examples. In this letter, we show that there is a possibility to see the hint of a new physics (top quark partner) indirectly by observing an "apparent" unitarity violation in $M_{bw}$ distribution well above top quark mass in a process of a heavy resonance decaying into a pair of top quarks.