Precision Measurement of a Particle Mass at the Linear Collider

TL;DR

This paper proposes a method for precise stop quark mass measurement at the ILC using cross-section data at two energies, reducing errors, and explores its implications for dark matter within the MSSM framework.

Contribution

It introduces a novel measurement technique for the stop mass at the ILC that minimizes errors and investigates its relevance for dark matter and baryogenesis.

Findings

Achieved high-precision stop mass measurement

Demonstrated compatibility with electroweak baryogenesis

Identified potential dark matter candidate in MSSM

Abstract

Precision measurement of the stop mass at the ILC is done in a method based on cross-sections measurements at two different center-of-mass energies. This allows to minimize both the statistical and systematic errors. In the framework of the MSSM, a light stop, compatible with electro-weak baryogenesis, is studied in its decay into a charm jet and neutralino, the Lightest Supersymmetric Particle(LSP), as a candidate of dark matter. This takes place for a small stop-neutralino mass difference.