The Vertex Tracker at Future e+e- Linear Colliders

The physics program of high energy e+e- linear colliders relies on the accurate identification of fermions to study in details the profile of the Higgs boson, search for new particles and later probe the multi-TeV mass region by direct searches and precision electro-weak measurements. This paper reviews the requirements, conceptual design and sensor R&D for the Vertex Tracker.Comment: 5 pages, to appear on the Proc. of th 6th Int. Conf. on Large Scale Applications and Radiation Hardness of Semiconductor Detectors, Firenze, September 200

Charting the Higgs Boson Profile e+e- Linear Colliders

The problems of the origin of mass and of electro-weak symmetry breaking are central to the programme of research in particle physics, at present and in the coming decades. This paper reviews the potential of high energy, high luminosity e+e- linear colliders in exploring the Higgs sector,to extend and complement the data which will become available from hadron colliders. The accuracy of measurements of the Higgs boson properties will not only probe the validity of the Higgs mechanism but also provide sensitivity to New Physics beyond the Standard Model.Comment: 16 pages, 8 figures, to appear in the Proc. of the 10th Int. Conference on Supersymmetry and Unification of Fundamental Interactions, DESY, Hamburg, June 200

Physics Signatures at CLIC

A set of signatures for physics processes of potential interests for the CLIC programme at 1 - 5 TeV are discussed. These signatures, that may correspond to the manifestation of different scenarios of new physics as well to Standard Model precision tests, are proposed as benchmarks for the optimisation of the CLIC accelerator parameters and for a first definition of the required detector response.Comment: 15 pages, 10 figure

The CLIC Study: Taking the LEP Legacy to the Multi-TeV Frontier

The CLIC Study that aims at a linear collider able to deliver e+e- collisions at centre-of-mass energies up to 5 TeV with luminosity of 10^35 cm^-2 s^-1 is presented. Its physics potential is outlined with special emphasis to the relationships to the experience gained in a decade of e+e- experimentation at LEP.Comment: 3 pages, to appear in the Proccedings of the XIII Conference on Physics at LEP, Rome, April 200

Jet Flavour Identification at the CLIC Multi-TeV e+e- Collider

Jet flavour identification in multi-TeV e+e- collisions is expected to provide insights on new phenomena at scales beyond those probed by the LHC. The anticipated high track density and jet collimation represent a new challenge to jet tagging algorithms. A method, based on the sampling of the jet charged multiplicity, sensitive to the long decay length and large decay multiplicity of heavy flavour hadrons is proposed and the expected performances for the tagging of e+e- -> bb events at 3 TeV are discussed.Comment: 4 pages, 2 figures, to appear in the proceedings of the 5th Int. Linear Colliders Workshop - LCWS2000, Fermilab, October 200

Physics Case and Challenges for the Vertex Tracker at Future High Energy e+e- Linear Colliders

The physics programme of high energy e+e- linear colliders relies on the accurate identification of fermions in order to study in details the profile of the Higgs boson, search for new particles and probe the multi-TeV mass region by means of precise electro-weak measurements and direct searches.Comment: 5 pages, to appear on the Proc. of the 9th Int. Workshop on Vertex Detectors - Vertex 2000, Lake Michigan MI (USA), September 200

Particle Identification for Physics beyond the LHC

Accelerator physics beyond the LHC is expected to provide precision in the study of new physics processes which the LHC may have already unveiled and to extend the high energy frontier beyond its reach, in the multi-TeV domain. In this paper I review the anticipated needs in terms of particle identification of this physics program in relation to the experimental conditions.Comment: 6 pages, 4 figures, invited contribution to the Second Workshop on advanced Transition Radiation Detectors for accelerators and space applications, Bari, September 200

Determination of Chargino and Neutralino Masses in high-mass SUSY scenarios at CLIC

This note reports the results of a study of the accuracy in the determination of chargino and neutralino masses in two high-mass supersymmetric scenarios through kinematic endpoints and threshold scans at a multi-TeV e+e- collider. The effects of initial state radiation, beamstrahlung and parton energy resolution are studied in fully hadronic final states of inclusive SUSY samples. Results obtained at generator level are compared to those from fully simulated and reconstructed events for selected channels.Comment: 26 pages, 25 figure