A Direct Measurement of tan(beta): e+e- -> bb -> bbA at a Future e+e- Linear Collider

TL;DR

This study demonstrates that a future linear collider could effectively measure tan(beta) in Higgs production via e+e- collisions, achieving high precision with realistic detector simulation and analysis techniques.

Contribution

First analysis of the reaction e+e- -> bbA at a future linear collider, showing potential for precise tan(beta) measurement using realistic simulation and advanced data analysis.

Findings

Signal could be observed with 500 fb-1 at 500 GeV

Achieved 100 signal over 100 background events for a 2 fb cross section

Estimated tan(beta) measurement precision of 7%

Abstract

The experimental sensitivity of the reaction e+e- -> bb -> bbA has been studied with a full-statistics background simulation for sqrt(s) = 500 GeV and L = 500 fb-1. The simulation is based on a fast and realistic simulation of a TESLA detector. For the first time this reaction has been analysed for a future linear collider and we show that a signal could be observed. A significant signal over background is achieved by the application of an Iterative Discriminant Analysis (IDA). For a signal production cross section of only 2 fb, which is expected for a Higgs boson mass of 100 GeV and tan(beta) = 50, we achieve 100 signal over 100 background events, and obtain for a tan(beta) measurement: Delta(tan(beta)) / tan(beta) = 0.07. This measurement requires a high-luminosity future collider as proposed in the TESLA project.