| Summary: | 碩士 === 國立高雄師範大學 === 物理學系 === 87 === We used the Monte-Carlo simulation method to analize the B rare decays (B+ -->K+Pi0 , B+ -->Pi+Pi0 ) in BELLE experiment at KEKB accelerator ( e+e- colliders with central mass energy of 10.58GeV ) in Japan.
At first, we used the QQ generator to generate random events, then we used of FSIM (Fast Simulation) and GSIM (Geant Simulation) to simulate the signal, and finally we proceed the physical analysis. We used the conservation of momentum and energy, the event shape, topology, and the kinematics of decay particles to reconstruct the B meson.
From the result of this study, if we can collect 10^7 Υ(4S) resonances at BELLE laboratory every half year, we can observe the decay mode (B+ -->K+pi0 ) within one year. If K/Pi separation (ACC) of BELLE works properly, we can have significant observation with half year data collection, then we can calculate the Branching Ratio of B+ -->K+Pi0 . With Branching Ratio of other decay modes such as B+- -->Pi+-K0 , B+- -->Pi+-Pi0 , B- -->K-Pi0 , we can calculate the phase angle gamma of unitary triangle. If gamma isn't equal to 0, we can observe the CP violation phenomenon.
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