G. Lo Re

GENIUS: a web portal for the grid

Abstract The architecture and the current implementation of the grid portal GENIUS (Grid Enabled web environment for site Independent User job Submission), jointly developed by INFN and NICE within the context of the INFN Grid and DataGrid Project, is presented and discussed.

Vertex finding in ALICE by the use of silicon pixel layers in the inner tracking system

Abstract The performance of the Inner Tracking System of the ALICE detector for primary vertex estimation is discussed. A simulation study of the vertex reconstruction in ALICE through the information given by the two pixel layers is reported. Vertex resolution was studied as a function of the nominal vertex location and of the particle multiplicity.

Tracking inside the ALICE Inner Tracking System

One of the main purposes of the ALICE Inner Tracking System (ITS) is to improve the resolution of the track parameters found in the main ALICE tracker detector, the Time Projection Chamber (TPC). Some results about tracking efficiency and resolution of track parameters obtained with a tracking code, based on the Kalman filter algorithm, are presented.

Neural tracking in ALICE

A neural network based algorithm to perform track recognition in the ALICE Inner Tracking System (ITS) for high transverse momentum particles (pt > 1 GeV=c) is presented,. The model is based on the Denby-Peterson scheme, with some original improvements which are necessary to cope with the very high track density expected in ALICE. Results are shown for a central Pb–Pb event at 5.5 A TeV in the center of mass system and the comparison with the Kalman Filter results is included. r 2003 Elsevier Science B.V. All rights reserved. PACS: 84.35.+i

Irradiation tests of the pixel front-end readout electronics for the ALICE experiment at LHC

The problem of radiation damage for the electronics of the pixel detectors in the Inner-Tracking-System of the ALICE experiment is discussed. Simulations allowed to estimate total doses and particle fluences during 10 years of operation period. Several irradiation tests have been carried out on the various prototypes of the readout chips. The results obtained so far points out that the recent prototypes will retain their functionality up to doses and neutron fluences well above those expected in ALICE.

Short lived resonances in ALICE

The ability of the ALICE detector to reconstruct the K*(892)0 resonance in p–p and Pb–Pb collisions at LHC energies has been investigated, by means of a detailed study of simulated events. PYTHIA events for p–p collisions and HIJING events for Pb–Pb collisions have been generated and fully reconstructed. The K*(892)0 was identified by its hadronic decay into Kπ through invariant mass analysis. The combinatorial background has been estimated using an event-mixing technique for p–p events and a like-sign technique for the Pb–Pb ones. The role of the particle identification of the decay product is also discussed.