Electroweak physics in six-fermion final states at future e+e- colliders

TL;DR

This paper presents comprehensive electroweak calculations for six-fermion final states at future e+e- colliders, including Higgs, top-quark, and gauge coupling studies, emphasizing the importance of detailed simulations for precision physics.

Contribution

It introduces a versatile Monte Carlo generator for full electroweak six-fermion processes, accounting for various diagram topologies, initial-state radiation, and background effects.

Findings

Electroweak backgrounds and finite-width effects are significant for accurate measurements.

Complete calculations are crucial for precision studies at the Linear Collider.

The generator effectively simulates signals and backgrounds for Higgs, top, and gauge coupling analyses.

Abstract

Three studies on six-fermion production processes are presented, in which the production of an intermediate-mass Higgs boson, the top-quark physics and the analysis of possible anomalous quartic gauge couplings are considered. A Monte Carlo event generator has been developed for full electroweak tree-level calculations on six-fermion processes at the Linear Collider. The Monte Carlo procedure has been adapted to deal with a large variety of diagram topologies, so as to keep under control the relevant signals and all the backgrounds of such processes. The effects of initial-state-radiation and beamstrahlung are also taken into account. The relevance of electroweak backgrounds and finite-width effects is discussed and several analyses of final-state distributions are presented, both for the detection of the signals of interest and for the study of properties of the particles involved, thus showing the importance of complete calculations for precision studies at the Linear Collider.