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Acronym: CAFPE
Number / Date of the contract: CEX-05-D11-81 / 21.10.2005
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Project Manager: Dr. Cornelia COCA
Starting date / finishing date: 2005-10-22 / 2008-10-21
Project value: 1243000 RON
Abstract: The main goal of the present and near future experiments in particle physics consists in finding the Higgs particle (responsible for generation of particle’s masses) and makes precise measurements of CP violation and rare events. In this contest each K- and B- sector provides an independent test of the Standard Model description of CP violation. Both must measure the same parameters for that description is correct. Only considering simultaneously as many processes as possible the parameters of a given theory can be fully determined. The rare K and B decay processes induced by Flavor Changing Neutral Currents (FCNC) play an important role in the study of weak decays and in verifying the Standard Model predictions for the mechanism of CP violation. These decays provide quantitative information on the CKM matrix-elements Vtd, Vts, and Vtb. When combined with other available CKM matrix-elements information, precision tests of the Standard Model can be made. Among the many B and K decays the rare decays K+??+ and KL ??0 are very special. A particular and very important virtue of K??is their clean theoretical character.
The NA 48/3 CERN experiment, under construction, aims to measure the ultra-rare kaon decay K+ ??+ at the CERN SPS by collecting a large sample of such decays with small background in two years of data taking. The principal goal is to measure the branching ratio and the magnitude of the CKM matrix element Vtd as well as other parameters with good precision of about 5%. The experiment will use a flux of 400 GeV/c protons from SPS, and consequently, a high energy secondary beam of positive kaons In this contest the studies proposed to be done in this project concern: simulation of the signal processes and the background processes in order to define the selection criteria (based on kinematics); simulation of the straw tracker detector in order to investigate its properties and its potential to detect and study K+ decay in flight; estimation of the S/B (signal to background) ratio and annual yield, the branching ratio for K+ ??+ and CKM parameters, sin2?, ?Vtd ?, and comparison with similar data from B decays; other activity concerns: some contribution to the construction and experimentation of the detector by participating in assembling and installing of the detector, participating in beam tests and setting-up online calibration procedure . Studies are based on huge computer simulation data. These allow particle physicists to predict the behavior of particles in the detector and to optimize it.
In order to achieve all the physics program we propose to develop the local computing capacity and install all the necessary infrastructure and special software packages for data processing, in a distributed multi-tier regional centers manner.

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