# Study of Λ decay parameter in J/ψ→ΛΛ decay

• 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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ZHONG Bin, PING Rong-Gang and XIAO Zhen-Jun. Study of Λ decay parameter in J/ψ→ΛΛ decay[J]. Chinese Physics C, 2008, 32(9): 692-696. doi: 10.1088/1674-1137/32/9/003
ZHONG Bin, PING Rong-Gang and XIAO Zhen-Jun. Study of Λ decay parameter in J/ψ→ΛΛ decay[J]. Chinese Physics C, 2008, 32(9): 692-696.
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Revised: 2008-01-21
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沈阳化工大学材料科学与工程学院 沈阳 110142

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## Study of Λ decay parameter in J/ψ→ΛΛ decay

###### Corresponding author: ZHONG Bin,

Abstract:

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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