New Physics signals from measurable polarization asymmetries at LHC

TL;DR

This paper proposes measurable polarization asymmetries at the LHC to determine the $A_b$ parameter, testing Standard Model predictions and exploring potential signs of new physics or supersymmetry.

Contribution

It introduces a new polarization asymmetry measurement at the LHC that can distinguish between Standard Model, supersymmetric, and non-supersymmetric new physics scenarios.

Findings

Proposes a measurable Z polarization asymmetry to determine $A_b$.

Identifies polarization measurements that can confirm or refute supersymmetry.

Suggests residual $A_b$ deviations indicate non-supersymmetric new physics.

Abstract

We propose a new type of Z polarization asymmetry in bottom-Z production at LHC that should be realistically measurable and would provide the determination of the so-called $A_b$ parameter, whose available measured value still appears to be in disagreement with the Standard Model prediction. This polarization can be measured independently of a possible existence of Supersymmetry. If Supersymmetry is found, a second polarization, i.e. the top longitudinal polarization in top-charged Higgs production, would neatly identify the $\tan \beta$ parameter. In this case, the value of $A_b$ should be in agreement with the Standard Model. If Supersymmetry does not exist, a residual disagreement of $A_b$ from the Standard Model prediction would be a clean signal of New Physics of "non Supersymmetric" origin.