טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentBressler Shikma
SubjectSearch for Long Lived Heavy Charged Super-Symmetric
Particles at the Large Hadron Collider (LHC) with
the ATLAS Experiment
DepartmentDepartment of Physics
Supervisor Professor Shlomit Tarem
Full Thesis textFull thesis text - English Version


Abstract

The Large Hadron Collider (LHC) at CERN will be the most powerful accelerator in the world, starting in 2007, it will produce proton-proton collisions at a center-of-mass energy of  and luminosity of . It is the only current candidate for producing physics beyond the standard model. ATLAS is a general-purpose experiment designed to fully exploit the LHC discovery potential and make new discoveries, as well as measure known phenomena precisely [1].


A long lived heavy charged supersymmetric particle is predicted by many models of physics beyond the standard model. The unique signature of such a particle is velocity significantly lower than the speed of light (b<1). The concept of particles with low b was not considered in the ATLAS trigger and data acquisition design, a fact that makes the search for it a unique and attractive challenge.


The main intention of this work is to guarantee that design issues will not prevent ATLAS from finding this new particle. Careful attention is paid to the different trigger scenario, and the data readout requirement. We show that different trigger scenarios result in different readout requirement, and conclude that the decision of which events will be read will have a dramatic effect on the ability of ATLAS to discover a slow particle.


The offline analysis that could performed for the discovery of a slow charged particle is also described. The focus is on the ability to distinguish between the signal and the background, which is expected mostly from muons. It appears possible to distinguish the signal from the background. However, since the signal to background ratio is unknown, we conclude that a detailed study of the expected muon background is essential. 


The second part of this work describes the latest developments in the design, implementation and integration of the ATLAS Thin Gap Chamber (TGC) Detector Control System (DCS).