טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentKajomovitz Enrique
SubjectBos Oscillations Measurement at Atlas
DepartmentDepartment of Physics
Supervisor Professor Yoram Rozen
Full Thesis textFull thesis text - English Version


Abstract

Oscillations in the Bs - Bs system have been a subject of intense experimental research during the last decade; a measurement of the oscillation frequency provides an indirect measurement of one of the parameters of the CKM matrix. In 2006 the CDF and D0 colaborations were able to measure the oscillation frequency for the first time, at  17.7 +/-0.10 ps-1 the oscillation frequency was found to be consistent with the unitarity requirements of the CKM matrix.

The Large Hadron Collider (LHC) will be the most powerful particle accelerator in the world, from Septerber 2008 Bs mesons will be produced in it at unprecedented rates, offering a promising scenario for the study of the physics related to Bs mesons.

The Atlas detector, is a general propouse detedctor designed to fully exploit the LHC potential. Atlas has a state of the art tracking system and muon identification capabilities, making it an ideal place for measuring the osicllation frequency of Bs mesons.

A feasibility study for the measurment of the Bs oscillation frequency is presented in this work. Atlas capabilities are explored using detalied Monte Carlo simulations; from the production of Bs events, to the detector response. Expectations are given for the primary factors relevant to the measurment sensitivity for the oscillation frequency (Excluding the background).
 Using as an input the information obtained from the detailied simulation studies, a simplified Monte Carlo program is used to simulate Bs oscillations. The Amplitude Fit technique is applied on simulated samples to extract Atlas sensitivity to the Bs oscillation frequency.

We reach the conclusion that Atlas will be capable to measure the oscillation frequency, within the first 30 pbarn of integrated luminosity, if the background levels do not exceed the background levels observed in CDF by more than a hundred times.