A Measurement of $R_b$ Using Multiple Tags

TL;DR

This paper presents a new measurement of the ratio $R_b$ at LEP using five exclusive hemisphere tags, achieving high precision in the result.

Contribution

It introduces a novel method employing five mutually exclusive hemisphere tags for measuring $R_b$ at LEP.

Findings

Measured $R_b = 0.2158$ with statistical and systematic uncertainties.

Demonstrated the effectiveness of the five-tag technique for precise $R_b$ measurement.

Achieved improved accuracy over previous measurements.

Abstract

A new measurement of $R_b$ with the ALEPH detector at LEP using five mutually exclusive hemisphere tags is presented. The preliminary result is $R_b = 0.2158 \pm 0.0009 (stat.) \pm 0.0011 (syst.)$.