Decay Contributions to Hyperon Polarization in High Energy Reactions

  • 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±0 would be better quantities for testing models.
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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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Decay Contributions to Hyperon Polarization in High Energy Reactions

    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

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±0 would be better quantities for testing models.

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