Interpreting AFBb, ALR and MW

TL;DR

This paper proposes that reconciling ALR and Mw measurements via a common T parameter amplifies the AFBb deviation, suggesting non-universal b quark behavior in extra dimension models with significant future experimental implications.

Contribution

It introduces a simple reconciliation of electroweak measurements by assuming a common T parameter, highlighting potential new physics in b quark behavior within extra dimension frameworks.

Findings

ALR and Mw can be reconciled with a common T parameter

AFBb deviation reaches 4 standard deviations

Predicted large deviations at future Z factories

Abstract

After the long-standing mismatch between ALR and AFBb measurements for predicting the Higgs boson mass, the recent and very precise result on Mw confirms the existence of a crisis in the sector of electroweak measurements. In this note, it is shown that ALR and Mw can be simply reconciled by assuming a common value for the T parameter. Consequently, the AFBb deviation is amplified and reaches a 4 s.d. significance. Interpreting this as evidence for a non-universal behaviour of the b quark is proposed within an extra dimension model. Large deviations with respect to the SM are expected at future Z factories.