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]	LIU Chang-Long , LU Yi-Ying , YIN LI . Effects of Additional Vacancy-Like Defects Produced by Ion Impealations on Boron Thermal Diffusion in Silicon. Chinese Physics C, 2005, 29(11): 1107-1111.
[2]	SHEN Shui-Fa , YU Xiao-Han . Decay of ⁸³Sr and Discussion of Its Daughter's Band Structures. Chinese Physics C, 2004, 28(S1): 78-80.
[3]	Medina Ablikim , HUANG Wei-Cheng , . New Realization of N=2 Supersymmetric QuantumMechanics and Shape Invariance. Chinese Physics C, 2002, 26(4): 338-345.
[4]	ZHOU Yong-Zhao , LIANG Hao , XUE Jun-Dong , CHEN Yi-Xin , YANG Tao , GONG Da-Tao , JIN Ge , YU Xiao-Qi . An Online Program for Monitoring KLOE Experiment. Chinese Physics C, 2002, 26(6): 620-625.
[5]	Yang Jianjun , Ma Boqiang , Li Guanglie . Non-perturbative Quark Propagator and the Study of the Non-trivial Q² Dependence in the Nucleon Structure Functions. Chinese Physics C, 1997, 21(2): 146-156.
[6]	Yu Hong , Shen Qixing , Zhang Lin . Angular Distribution of Process e⁺e^－→τ⁺τ^－,τ^－→a₁υτ,a₁→ρπ and Characteristics of a₁ Meson. Chinese Physics C, 1994, 18(7): 583-590.
[7]	BES Collaboration . Experimental Study of Resonance f₂(1270) in the J/ψ Hadronic Decay. Chinese Physics C, 1993, 17(2): 97-106.
[8]	SANG Jian-Ping , LIU Chao-Shan , LIU Yong . Relation Between the Gap at Z=64 Subshell and the Abrupt Transition in the Region N=88～90. Chinese Physics C, 1991, 15(2): 150-157.
[9]	HOU Ren-Chang , ZHAO Xuan . QUADRUPOLE-OCTUPOLE TWO-PHONON EXCITATIONS IN INELASTIC SCATTERING. Chinese Physics C, 1983, 7(2): 236-244.
[10]	Sa Ben-hao , Zhang Xi-zhen , Li Zhu-xia , Shi Yi-jin . A PRIMARY RESEARCH OF THE PHONON RENORMALIZATION OF NUCLEAR FIELD THEORY. Chinese Physics C, 1980, 4(3): 398-400.

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(3912)
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.