Student info and photos:VWZ

People
Work Description

Roberto VERSACI
University and INFN Roma
versaci@fis.uniroma3.it

 For my Ph.D. thesis I am working on KLOE, the detector operating at DAPHNE phi-factory at LNF. I am performing analysis on charged kaons decays on the data acquired till 2002. The main goal of this analysis is to measure the absolute branching ratios of charged kaons. In this way it will be possible to improve the knowledge of the Vus mixing angle in the CKM matrix. The value reported by PDG had been obtained using few data collected more than 30 years ago. On the hardware side I'm interested in the maintenance of the trigger system.

Sebastien VIRET
LPP, Grenoble
viret@lpsc.in2p3.fr

I am working for my PhD thesis on ATLAS experiment, one of the four detectors of the LHC. The main purpose of my work is to study ATLAS potential in some particular B-physics channels.
B-decays are useful laboratories for testing the Standard Model, and a very good comprehension of this model is necessary if we want to go beyond. That's why B-physics will take an important place at the LHC.
I'm currently looking at radiative B-decays, which are strongly suppressed by the Standard Model. This analysis largerly depends on the photon reconstruction, that's why I am also involved in electromagnetic calorimeter testbeam analysis. I am comparing photon testbeam data to Geant4 Monte-Carlo simulation, in order to test calorimeter performances in the photon sector.

Tuan VU ANH
LAL, Orsay
tuan.vu-anh@m4x.org

This PhD has been under preparation with the D-Zero collider detector in TeVatron, Fermilab in operation since March 2001. One part of the current work concentrates on comparing and subsequently finely tuning the agreement between data and simulation electrons/photons (EM objects). The other is to estimate the probability that a hadronic jet mimics an EM object. The thesis subject is to look for possible R-parity-conserved squark and gluino decays into two leptons plus missing transverse energy.

Ronald WEBER
ETH , Zurich
ronald.weber@psi.ch

 For the hardware part of my Ph.D. thesis at PSI, I am engaged in the development of the CMS pixel detector for LHC. The pixel detector has three layers, whereas each layer is built-up of modules. A module contains 16 Readout chips (ROC), a sensor element and various control elements. My engagement includes the prototyping of the first module.
In parallel I am involved in the translation of the ROC to the quarter micron technology.
For the software side I participate in H1 at HERA. The recent updates of HERA and H1 is expected to bring higher statistics, which allows further analysis of the differential process of b-production as well as direct measurements of the b-structure function.

Viatcheslav ZHOLOBOV
IHEP, Protvino
zhslava@rambler.ru

I am working on the big scintillation counters with WLS readout which will be used to trigger the Lar spectrometer BARS containing 600t of LAr. BARS is planned to be used in the experiments with neutrino beams from 70 GeV IHEP accelerator and for cosmic ray (EAS) studies. Personally I have performed measurements of WLS attenuation length vs its radius of curvature and developed software for MC simulations of light propagation both in scintillators and WLS. Now I am busy with PM selection for the counters and with software for track reconstruction in BARS.

Stephanie ZIMMERMANN
Albert-Ludwigs Universitat Freiburg
Stephanie.Zimmermann@cern.ch

 My PhD project comprises 2 different activities, both in the field of detector development for the Atlas Muon Spectrometer, in particular for the monitored drift tubes (MDT) used for tracking in the barrel part. The first activity is centered on the behaviour of these drift tubes in a high background rate environement as the one expected at LHC. One of the first production chambers was used in the CERN Gamma Irradiation Facility GIF in summer 2002 and its response to 100 GeV beam-muons in presence of intense photon irradiation was studied. My second activities is centered on the evaluation of a prototype for the circulating gas system for the MDTs in the context of detector ageing and longterm operational behaviour.

Catherine Cart 07/2003