Moment Analysis and ξ(2220)

YU Hong; SHEN Qi-Xing

Chinese Physics C> 1993, Vol. 17> Issue(10) : 892-897

Moment Analysis and ξ(2220)

YU Hong ^, ,
SHEN Qi-Xing

Institute of High Energy Physics,Academia Sinica,Beijing 100039

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Abstract：
In order to reduce the influence of the geometrical acceptance and improve the precision we introduce the pseudoscalar meson angular distribution of the moment H_J(jm,θ).It is more sensitive than the usual projective pseudoscalar meson angular distribution W_J(θ) for determining that the spin of the ξ(2220) is 2 or 4.We also give some moments which are needed for the moment analysis and some relations of moments to represent the helicity amplitude ratios x_J and y_J directly.

References

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K. F. Einsweiler,SLAC-PUB-3202(1983).[2]R. M. Baltruaitis et al. ,Phys. Rev. Lett. ,56(1986) ,107.[3]J. becker et al.，Contributed paper to the 23rd Int. Conf. on HEP,Berkeley, July 1986 and SLAC-PUB-4246(1987).[4]G. Eigen,CALT-68-1483 (1987).[5]J. Augustin et al. ,Phys. Rev.l.ett. ,60(1988),2238.[6]H. Haber,G. Kane,Phys. Lett. ,135B(1984) ,196;R. Wiley,Phys. Rev.lett. ,52(1984),585R. M. Barnett et al. ,Phys. Rev. ,D30(1984),1529:B. F. L. Ward,Phys. Rev. ,D31(1985 ) , 2849; D32(1986) ,1260;沈齐兴、郁宏，高能物理与核物理，14(1990),477;M. Chanovritz,S. R. Sharpe,Phys. Lett. ,132B(1983),413;K. T. Chao,Phys. Rev. Lett. ,60(1088),134;S.Pakvasa et al. ,Phys.Lett. ,145B(1984),134,Phys.Rev. ,D31(1985),2378;S. Godfrey, R. Kokoski ,N. lagur,Phys. Lett. ,141B(1984) , 439.[7]郁宏，高能物理与核物理，13(1989),87.[8]严武光、郁宏，高能物理与核物理，13(1989),234.[9]Yu Hong,Commun.Thear.Phys. ,12(1989),239.[10]郁宏、沈齐兴，高能物理与核物理，16(1992),861.

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YU Hong and SHEN Qi-Xing. Moment Analysis and ξ(2220)[J]. Chinese Physics C, 1993, 17(10): 892-897.

YU Hong and SHEN Qi-Xing. Moment Analysis and ξ(2220)[J]. Chinese Physics C, 1993, 17(10): 892-897. shu

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Received: 1900-01-01
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Moment Analysis and ξ(2220)

YU Hong ^,
SHEN Qi-Xing

Corresponding author: YU Hong,

Institute of High Energy Physics,Academia Sinica,Beijing 100039

Received Date: 1900-01-01
Accepted Date: 1900-01-01
Available Online: 1993-10-05

Abstract: In order to reduce the influence of the geometrical acceptance and improve the precision we introduce the pseudoscalar meson angular distribution of the moment H_J(jm,θ).It is more sensitive than the usual projective pseudoscalar meson angular distribution W_J(θ) for determining that the spin of the ξ(2220) is 2 or 4.We also give some moments which are needed for the moment analysis and some relations of moments to represent the helicity amplitude ratios x_J and y_J directly.