ON THE SENSITIVE AREA OF SPIN-PARITY ANALYSIS FOR J/ψ RADIATIVE DECAY PRODUCTS INTO TWO PSEUDOSCALARS

YAN Wu-Guang

Chinese Physics C> 1990, Vol. 14> Issue(3) : 193-199

ON THE SENSITIVE AREA OF SPIN-PARITY ANALYSIS FOR J/ψ RADIATIVE DECAY PRODUCTS INTO TWO PSEUDOSCALARS

YAN Wu-Guang ^,

Institute of High Energy Physics,Academia Sinica

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Abstract：
The spin-parity analysis of the J/ψ radiative decay products into two pseudoscalars usually uses the angular distribution calculated by the helicity amplitude formalism.This paper investigated the sensitivity of this method and pointed out the followings; 1) there really exists some insensitive area; 2).unfortunately,θ(1720) falls into the insensitive area of 2⁺-0⁺ distinction; so the spin of θ(1720) has not been finally established yet; 3).according to the Mark-3 data,for the newly observed very narrow peak ξ(2230),the spin 0⁺ assignment can be ruled out.

References

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T. Z. RUAN, et al., Proceedings of the BIMP Symposium on Heavy Flavor Physics, p. 410-418, Aue.11, 1988, Beijing; T. Z. RUAN, et al., to be published in High Energy Physics and Nuclear Physics.[2] 赵佩英等，物理学报，26(1977),16;C. S. GAO, et al., Proceedings of the Workshop on Colliding Beam Physics, p. 243, June, 1984, Beijing.[3] M. JACOB and G. C. WICK,Ann. Phys., (NY) 7(1959), 404;K. F. EINSWEILER, SLAG Report 272(1984);R. M. BALTRUSAITIS et al. Phys. Rev., D 35(1987), 2077.[4] C.EDWARDS et al., Phys, Rev. Lett., 48(1982), 458;C.EDWARDS et al., Phys. Rev.，D25(1982), 3065.[5] M. E. B. FRANKLIN, SLAC Report 254(1982).[6] J. E, AUGUSTIN et al., Orsay preprint, LAL/85-27(1985);J. E. AUGUSTIN et al., Phys. Rev. Lett., 60(1988), 2238.

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YAN Wu-Guang. ON THE SENSITIVE AREA OF SPIN-PARITY ANALYSIS FOR J/ψ RADIATIVE DECAY PRODUCTS INTO TWO PSEUDOSCALARS[J]. Chinese Physics C, 1990, 14(3): 193-199.

YAN Wu-Guang. ON THE SENSITIVE AREA OF SPIN-PARITY ANALYSIS FOR J/ψ RADIATIVE DECAY PRODUCTS INTO TWO PSEUDOSCALARS[J]. Chinese Physics C, 1990, 14(3): 193-199. shu

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

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

ON THE SENSITIVE AREA OF SPIN-PARITY ANALYSIS FOR J/ψ RADIATIVE DECAY PRODUCTS INTO TWO PSEUDOSCALARS

YAN Wu-Guang ^,

Corresponding author: YAN Wu-Guang,

Institute of High Energy Physics,Academia Sinica

Received Date: 1900-01-01
Accepted Date: 1900-01-01
Available Online: 1990-03-05

Abstract: The spin-parity analysis of the J/ψ radiative decay products into two pseudoscalars usually uses the angular distribution calculated by the helicity amplitude formalism.This paper investigated the sensitivity of this method and pointed out the followings; 1) there really exists some insensitive area; 2).unfortunately,θ(1720) falls into the insensitive area of 2⁺-0⁺ distinction; so the spin of θ(1720) has not been finally established yet; 3).according to the Mark-3 data,for the newly observed very narrow peak ξ(2230),the spin 0⁺ assignment can be ruled out.