Search for single top quark production via contact interactions at LEP2

TL;DR

This study searched for single top quark production via contact interactions at LEP2 energies, finding no evidence and setting limits on the interaction energy scale for various coupling types.

Contribution

First search for single top production via contact interactions at LEP2, establishing new limits on the energy scale for different coupling scenarios.

Findings

No evidence of single top production was observed.

Limits on the energy scale Lambda were set for scalar, vector, and tensor interactions.

Abstract

Single top quark production via four-fermion contact interactions associated to flavour-changing neutral currents was searched for in data taken by the DELPHI detector at LEP2. The data were accumulated at centre-of-mass energies ranging from 189 to 209 GeV, with an integrated luminosity of 598.1 pb^-1. No evidence for a signal was found. Limits on the energy scale Lambda, were set for scalar-, vector- and tensor-like coupling scenarios.