Decay Contributions to Hyperon Polarization in High Energy Reactions

LI Yuan; SHAO Feng-Lan

Chinese Physics C> 2007, Vol. 31> Issue(9) : 810-814

Decay Contributions to Hyperon Polarization in High Energy Reactions

LI Yuan ,
SHAO Feng-Lan ^,

Physics Department, Teachers College, Qingdao University, Qingdao 266071, China2 School of Physics and Microelectronics, Shandong University, Jinan 250100, China3 School of Physics and Engineering, Qufu Normal University, Qufu 273165, China

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Abstract：
By analyzing different hyperon decay processes, we derive the general formula for the decay contributions of heavier hyperons to hyperon production rates and final-state hyperon polarizations. Using a Monte-Carlo event generator , we study the decay contributions of hadrons to the final state hyperon polarizations in high energy reactions. The calculated results show that the decay contributions to the Λ polarization from other hyperons are very large and this result is universal and model independent. The polarization difference of Λ with high p_⊥ in the singly polarized pp collision among different models may mainly come from the decay contributions of hadrons. Considering the uncertainties of such calculations, the polarizations of Σ^±,Ξ⁰,Ξ^－ would be better quantities for testing models.

References

[1]

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LI Yuan and SHAO Feng-Lan. Decay Contributions to Hyperon Polarization in High Energy Reactions[J]. Chinese Physics C, 2007, 31(9): 810-814.

LI Yuan and SHAO Feng-Lan. Decay Contributions to Hyperon Polarization in High Energy Reactions[J]. Chinese Physics C, 2007, 31(9): 810-814. shu

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Received: 2006-12-15
Revised: 2007-03-12

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沈阳化工大学材料科学与工程学院沈阳 110142

Decay Contributions to Hyperon Polarization in High Energy Reactions

LI Yuan
SHAO Feng-Lan ^,

Corresponding author: SHAO Feng-Lan,

Physics Department, Teachers College, Qingdao University, Qingdao 266071, China2 School of Physics and Microelectronics, Shandong University, Jinan 250100, China3 School of Physics and Engineering, Qufu Normal University, Qufu 273165, China

Received Date: 2006-12-15
Accepted Date: 2007-03-12
Available Online: 2007-09-05

Abstract: By analyzing different hyperon decay processes, we derive the general formula for the decay contributions of heavier hyperons to hyperon production rates and final-state hyperon polarizations. Using a Monte-Carlo event generator , we study the decay contributions of hadrons to the final state hyperon polarizations in high energy reactions. The calculated results show that the decay contributions to the Λ polarization from other hyperons are very large and this result is universal and model independent. The polarization difference of Λ with high p_⊥ in the singly polarized pp collision among different models may mainly come from the decay contributions of hadrons. Considering the uncertainties of such calculations, the polarizations of Σ^±,Ξ⁰,Ξ^－ would be better quantities for testing models.