Beam Test of the BELLE Extreme Forward Calotimeter at KEK and The Monte Carlo Study of B+ -> w pi+

碩士 === 國立臺灣大學 === 物理學研究所 === 89 === Abstract The Extreme Forward Calorimeter (EFC) is successfully running in KEK for BELLE and she is made by the Taiwan BELLE Group. We had a beam test for the prototype EFC at KEK-PS p2 beam line by using beams with energies from 1 to 3 GeV. T...

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Bibliographic Details
Main Authors: Lee Ming-Chieh, 李明杰
Other Authors: Min-Zu Wang
Format: Others
Language:en_US
Published: 2001
Online Access:http://ndltd.ncl.edu.tw/handle/43211817550316920074
Description
Summary:碩士 === 國立臺灣大學 === 物理學研究所 === 89 === Abstract The Extreme Forward Calorimeter (EFC) is successfully running in KEK for BELLE and she is made by the Taiwan BELLE Group. We had a beam test for the prototype EFC at KEK-PS p2 beam line by using beams with energies from 1 to 3 GeV. The prototype EFC is 1/8 of the full scale one. Due to space limitations, the BGO crystals have only 12 radiation lengths. The measured energy resolution is about 7-10% and linearity about 1%. I also did the physics analysis in the B+ ® w p+ mode. In my study, 1973 signal events are accepted in 100,00 generated events, and 75 background events are kept in 1.92* 106 continuum events. Assuming the branching ratio of B+ -> w pi+ is 1* 105, we obtain the S/N is ~ 1.86%.