| Study of Λ decay parameter in J/ψ→ΛΛ decay |
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| 作者姓名： | 钟彬 平荣刚 肖振军 |
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| 作者单位： | 1 Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing 210097, China;2 Institute of High Energy Physics, CAS, P.O.Box 9184, Beijing 100049, China |
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| 摘 要： | The helicity amplitudes for J/ψ→ΛΛ and the relevant background decays are presented for measuring the Λ decay parameter α+(Λ→pπ+) in J/ψ→ΛΛ . The Monte Carlo (MC) simulations based on the helicity amplitudes information are carried out. The likelihood fit method to determine the Λ decay parameter is presented. Based on the MC generated sample, the sensitivity of the measurement for α+ has been estimated, which shows that the J/ψ→ΛΛ channel can be used to measure the Λ decay parameter α+(Λ→pπ+) well.
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| 关 键 词： | parity asymmetry hyperon nonleptonic decays J/ψ decays |
| 收稿时间： | 2007-12-03 |
| 修稿时间： | 2008-01-21 |
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