Foto del docente

Stefano Zucchelli

Associate Professor

Department of Physics and Astronomy "Augusto Righi"

Academic discipline: FIS/01 Experimental Physics

Research

Keywords: High energy neutrinoless double beta decay CERN LHC-b Accelerator physiscs Underground experiment in the LNGS Lab. CUORE collaboration CDF Collaboration Tevatron Collider

The research  performed by Stefano Zucchelli are both in the contest of high energy physics. The first one is the study of the proton antiproton collisions at high energy. The secon one is a research of rare decays thast is to say the search for the neutrinoless double beta decay.



First Research line-

In 1990 Stefano Zucchelli  joined the CDF collaboration, an experiment at the Fermilab Tevatron Collider . CDF is an international collaboration of many institutions, among which the University of Bologna and the INFN section of Bologna.   Of great importance was the discovery made by the experiment in 1994 of the existence of the “top” quark and the precise measurement of its mass and production cross section . The CDF detector was an all-purpose apparatus allowing one to move in all the fields of study of the hadronic interactions.    

The Bologna group gave its contribution in analyzing the large amount of data collected  at low four momentum transfer (low Pt), the so called  Minimum Bias  and Zero Bias triggers,

undertaking starting on  2006  the full  reponsability of the  low Pt data reduction into standard n-tuples.  The analysis of the Minimum Bias trigger  gave an essential contribution, in terms of calibration and control of the several detectors of the CDF experimental apparatus.  The specific studies carried out  by the Bologna group on Minimum Bias data have lead to important observations of invariance behavior of the low Pt component  ( soft interactions)  of the  hadronic multibodies production,  as function of center of mass energy.   

These results have been already published for the great part, but some analysis is still under way, with a view of a next publication.  Stefano Zucchelli actively participated to the Bologna group data analysis, in particular the one centered on the systematic study of the low Pt interactions. In addition the Bologna group, directly coordinated by the undersigned, collaborated to the construction of an electromagnetic and hadronic calorimeter of new design.  The instrument, that innovatively matched the use of wave length shifter fibres with scintillator tiles, was part of the CDF upgrade (Plug and End Cap calorimeters). Finally the Bologna group contributed to the planning and realization of the ISL (Intermediate Silicon Layer),  the detector's mechanic support, modernization of the VTX of  CDFII. As a whole the detectors upgrade have lead to the renovation and substitution of about two thirds of the CDF apparatus and have given birth to a second phase of data collection, called run II, that finally ended in 2011.

 

--Second Research Line

Since 2008 he is also member of the Cuore experiment. This experiment, which will take place at the INFN Underground Gran Sasso Laboratory, has the aim to measure  or set limits on the neutrino mass and to determine  the nature, either  Majorana or Dirac, of the neutrino, by studying  the neutrinoless double beta decay. The detector will be a cryogenic detector, a bolometer, made of tellurium oxide crystals. The Bologna group, coordinated by the undersigned, has up to now actively contributed to the construction of the detector. In particular the group took care of the preparation at the Gran Sasso laboratories of a storage room free of radon for the storage of more than a thousand tellurium oxide crystals and to realize the database for the management of the same crystals. For what concerns the commissioning activities, the group is responsible for the delicate movement of the cryogenic vessels of the Cuore cryostat. It also contributes to the set up of the experiment's Slow Control software.

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