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

Abstract
HTML
Reference
Related

PDF

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]

. Buskulic D et al. (ALEPH Collab.). Phys. Lett., 1996,B374: 3192. Ackersta K et al. (OPAL Collab.). Eur. Phys. J., 1998,C2: 493. Airapetian A et al. (HERMES Collab.). Phys. Rev., 2001,D64: 1120054. Adams M R et al. (E665 Collab.). Euro. Phys. J., 2000,C17: 2635. Astier P et al. (NOMAD Collab.). Nucl. Phys., 2000, B588:3; ibid 2001, B605: 36. Bunce G, Saito N, So er J et al. Ann. Rev. Nucl. Part. Sci.,2000, 50: 525-5757. Boros C, LIANG Zuo-Tang. Phys. Rev., 1998, D57: 44918. LIU Chun-Xiu, LIANG Zuo-Tang. Phys. Rev., 2000, D62:0940019. LIU Chun-Xiu, XU Qing-Hua, LIANG Zuo-Tang. Phys.Rev., 2001, D64: 07300410. LIANG Zuo-Tang, LIU Chun-Xiu. Phys. Rev., 2002, D66:05730211. XU Qing-Hua, LIU Chun-Xiu, LIANG Zuo-Tang. Phys.Rev., 2002, D65: 11400812. MA Bo-Qiang, Schmidt I, So er J et al. Nucl. Phys., 2002,A703: 34613. MA Bo-Qiang, Schmidt I, YANG J J. Phys. Rev., 2000,D61: 03401714. Andersson B, Gustafson G, Ingelman G et al. Phys. Rep.,1983, 97: 3115. Sjostrand T. Comp. Phys. Commun., 1994, 82: 7416. XU Qing-Hua, LIANG Zuo-Tang, Sichtermann E. Phys.Rev., 2006, D73: 077503

[1]	Bao Temurbagan , LIU Guang-Zhou , ZHU Ming-Feng , LIU Wei . Influence of Hyperon Coupling Constant on the Properties of Hybrid Stars. Chinese Physics C, 2006, 30(10): 961-965.
[2]	LIU Xi-Ming , ZHANG Xue-Rao , WANG Hai-Long . Universal Mass Dependence of Final Hadron Yields in High Energy Reactions. Chinese Physics C, 2001, 25(5): 377-382.
[3]	LV Yan , YANG Li-Jian , YANG Li-Ping , MAO Tian . Monte Carlo Study of the Properties of Jets in High Energy Hadron-Hadron Collisions. Chinese Physics C, 2001, 25(11): 1077-1083.
[4]	LIU Chun-Xiu , LIANG Zuo-Tang . Spin Transfer in High-Energy Hadronization Processes and Polarization of Hyperon in the Lepton-Induced Reactions. Chinese Physics C, 2001, 25(6): 476-486.
[5]	DAI ZhiQiang , XUE Liang , LI JinYu , ZHANG XueYao , FENG CunFeng , FU Yu , LI Jie , CAO PeiYuan , ZHANG NaiJian , HE Mao , WANG ChengRui , REN JingRu , LU SuiLing . Phenomenon of Energy Concentration in Super-High Energy γ-Hadron Families. Chinese Physics C, 2000, 24(10): 885-891.
[6]	Yu Hong , Shen Qixing . Multi-channel Coupling in the Hadronic Decay Process J/ψ→ωπ⁺π^－. Chinese Physics C, 1997, 21(2): 123-129.
[7]	BES Collaboration . Abnormal Suppression of Vector-Tensor Decays of ψ(2S). Chinese Physics C, 1997, 21(1): 89-96.
[8]	Liu Feng(Y) , Liu Feng . Comparison of the Hard and Soft Processes in High Energy Hadron-Hadron Colisions. Chinese Physics C, 1997, 21(4): 330-339.
[9]	Ren Jingru , Lu Suiling , Wang Chengrui , He Mao , Zhang Naijian , Cao Peiyuan , Li Jinyu , Wang Sh , Wang izhi , Wang Mingxing . Attenuation of High Energy Hadrons in Iron. Chinese Physics C, 1996, 20(5): 405-408.
[10]	Cao Zhen , Ding Linkai . Chou-Yang Model for the Description of Ultrahigh Energy Soft Hadronic Interactions. Chinese Physics C, 1994, 18(11): 990-995.
[11]	SHEN Qi-Xing , YU Hong . The Polarization States of the Gluon and the Glueball Interpretation of the ξ(2230). Chinese Physics C, 1991, 15(5): 477-480.
[12]	YU Hong , SHEN Qi-Xing . J/ψ Hadronic Decay and 11^－+ Exotic States. Chinese Physics C, 1991, 15(9): 861-864.
[13]	YU Hong , SHEN Qi-Xing . THE MOMENT ANALYSIS FOR THE J/ψ HADRONIC DECAY PROCESS. Chinese Physics C, 1990, 14(10): 875-881.
[14]	DING Lin-Kai . FRAGMENTATION REGION BEHAVIOUR OF HIGH ENERGY HADRONIC INTERACTIONS. Chinese Physics C, 1990, 14(5): 399-406.
[15]	WU Yuan-Fang , LIU Lian-Shou . INVESTIGATION OF THE HIGH ENERGY LIMIT IN HADRON-HADRON COLLISION USING MEM. Chinese Physics C, 1989, 13(9): 808-813.
[16]	FANG Hai-Ping , XIE Qu-Bing , LAI Xiao-Ping . RAPIDITY DISTRIBUTION AND BARYON-ANTIBARYON CORRELATIONS IN e⁺e^－→TWO JET EVENTS. Chinese Physics C, 1989, 13(6): 518-525.
[17]	XIE Qu-Bing , LIU Xi-Ming . THE RATIO OF BARYON TO MESON MESON IN HIGH ENERGY HADRONIC REACTION. Chinese Physics C, 1987, 11(2): 192-197.
[18]	XIE Qu-Bing , LIU Xi-Ming . THE YIELDS OF FINAL PARTICLES IN HIGH ENERGY HADRON REACTION. Chinese Physics C, 1987, 11(4): 476-482.
[19]	ZHANG Chang-Chun . RECENT MEASUREMENTS OF TWO PHOTON MUON PAIR PROCESS FROM MARK J. Chinese Physics C, 1986, 10(4): 400-411.
[20]	Shen Jian-ping , Zhang Zong-ye . THE EFFECTS INDUCED BY A Λ HYPERON ON THE PAIRING CORRELATION IN NUCLEUS. Chinese Physics C, 1980, 4(1): 43-48.

Access

Get Citation

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

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

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

Article Metric

Article Views(3160)
PDF Downloads(694)
Cited by(0)

Policy on re-use

To reuse of subscription content published by CPC, the users need to request permission from CPC, unless the content was published under an Open Access license which automatically permits that type of reuse.

通讯作者: 陈斌, bchen63@163.com

1.
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.