Martin Siebel

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A search for unstable heavy fermions with the DELPHI detector at LEP is reported. Sequential and non-canonical leptons, as well as excited leptons and quarks, are considered. The data analysed correspond to an integrated luminosity of about 48 pb 1 at an ee centre-of-mass energy of 183 GeV and about 20 pb 1 equally shared between the centre-of-mass energies(More)
The study of the differences of the fragmentation of quarks and gluons to jets of hadrons gives insight into the fundamental structure of QCD. Results from different approaches to properties of quarks and gluons are shown. The colour factor ratio CA/CF is measured in agreement with the QCD prediction. Identified particles in quark and gluon jets are(More)
A search for pair-produced charged Higgs bosons was performed in the data collected by the DELPHI detector at LEP II at centre-of-mass energies from 189GeV to 209GeV. Five different final states, τνττ −ν̄τ , cs̄c̄s, cs̄τ−ν̄τ , W∗AW∗A andW∗Aτ−ν̄τ were considered, accounting for the major expected decays in type I and type II Two Higgs Doublet Models. No(More)
Promptly decaying lightest neutralinos and long-lived staus are searched for in the context of light gravitino scenarios. It is assumed that the stau is the next to lightest supersymmetric particle (NLSP) and that the lightest neutralino is the next to NLSP (NNLSP). Data collected with the Delphi detector at centre-of-mass energies from 161 to 183 GeV are(More)
These final results on e+e− → W+W− production cross-section measurements at LEP2 use data collected by the DELPHI detector at centre-of-mass energies up to 209GeV. Measurements of total cross-sections, W angular differential distributions and decay branching fractions, and the value of the CKM element |Vcs| are compared to the expectations of the Standard(More)
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