Reconstruction of Photon Conversions and Precise Measurement of Photon Energy at BESⅡ

ZHANG Chang-Chun; WANG Zhe; YUAN Ye

Chinese Physics C> 2006, Vol. 30> Issue(5) : 378-386

Reconstruction of Photon Conversions and Precise Measurement of Photon Energy at BESⅡ

Institute of High Energy Physics, CAS, Beijing 100049, China2 Department of Technical Physics, Peking University, Beijing 100871, China3 Department of Engineering Physics, Tsinghua University, Beijing 100084, China

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Abstract：
Using Monte Carlo simulation, reconstruction of photon conversions is studied, and the detection efficiency and energy resolution as a function of photon energy are obtained.The dE/dx correction for the electrons from photon conversions and the energy scale for the photons are calibrated with BESⅡ data. An improved Crystal Ball function describes well the energy distribution of the photons. Photon energy resolutions in the range from 2.3 to 3.8MeV are found for the photons with energy from 100 to 260MeV at the BESⅡ~detector.

References

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ZHANG Chang-Chun, WANG Zhe and YUAN Ye. Reconstruction of Photon Conversions and Precise Measurement of Photon Energy at BESⅡ[J]. Chinese Physics C, 2006, 30(5): 378-386.

ZHANG Chang-Chun, WANG Zhe and YUAN Ye. Reconstruction of Photon Conversions and Precise Measurement of Photon Energy at BESⅡ[J]. Chinese Physics C, 2006, 30(5): 378-386. shu

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Received: 2005-09-09
Revised: 2006-01-05

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