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Chinese Physics C> 2006, Vol. 30> Issue(8) : 718-723 

A Generator for Multipole Analysis of ψ′→γ′χcJ→γ′γJ/ψ

  •  Institute of High Energy Physics, CAS, Beijing 100049, China2 CCASTWorld Laboratory, Beijing 100080, China

  • To experimentally study the charmonium ψ′cascade radiative decay, ψ′→γ′χcJ→γ′γJ/ψ, a generator which describes correctly all angular distributions is a necessity. We can determine the photon multipolarities (or equivalently the helicity couplings) by analyzing the angular correlations. In this work, a generator with fulls description of angular distributions for such process will be introduced, as well as the measurement method of multipolarities will be discussed, which can be implemented at BESⅢ/BEPCⅡ or CLEOc.
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    [1] . Eichten E et al. Phys. Rev., 1978, D17: 30902. Gupta S N, Radford S F, Repko W W. Phys. Rev., 1982,D26: 33053. McClary R, Byers N. Phys. Rev., 1983, D28: 16924. Grotch H, Owen D A, Sebastian K J. Phys. Rev., 1984,D30: 19245. Kabir P K, Hey A J G. Phys. Rev., 1976, D13: 31616. Sebatian K J, Grotch H. Phys. Rev., 1992, D45: 31637. Karl G et al. Phys. Rev., 1976, D13: 12038. Doncheske M A, Grotch H, Sebastian K J. Phys. Rev., 1990,D42: 22939. BAI J Z et al. Phys. Rev., 2004, D70: 01200610. Oreglia M. Ph.D. thesis. Standford University Report.SLAC-226, 198011. Oreglia M et al. Phys. Rev., 1982, D25: 225912. Gaiser J E et al. Phys. Rev., 1986, D34: 71113. Armstrong T A et al. Phys. Rev., 1993, D48: 303714. Ablikim M et al. Nucl. Instrum. Methods, 2005, A552: 34415. Eidelman S et al(Particle Data Group). Phys. Lett., 2004,B592: 1

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LI Gang, ZHU Yong-Sheng and WANG Zhi-Yong. A Generator for Multipole Analysis of ψ′→γ′χcJ→γ′γJ/ψ[J]. Chinese Physics C, 2006, 30(8): 718-723.
LI Gang, ZHU Yong-Sheng and WANG Zhi-Yong. A Generator for Multipole Analysis of ψ′→γ′χcJ→γ′γJ/ψ[J]. Chinese Physics C, 2006, 30(8): 718-723. shu
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Received: 2006-02-23
Revised: 2006-03-24
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A Generator for Multipole Analysis of ψ′→γ′χcJ→γ′γJ/ψ

    Corresponding author: LI Gang,
  • Institute of High Energy Physics, CAS, Beijing 100049, China2 CCASTWorld Laboratory, Beijing 100080, China
  • Received Date: 2006-02-23
  • Accepted Date: 2006-03-24
  • Available Online: 2006-08-05

Abstract: To experimentally study the charmonium ψ′cascade radiative decay, ψ′→γ′χcJ→γ′γJ/ψ, a generator which describes correctly all angular distributions is a necessity. We can determine the photon multipolarities (or equivalently the helicity couplings) by analyzing the angular correlations. In this work, a generator with fulls description of angular distributions for such process will be introduced, as well as the measurement method of multipolarities will be discussed, which can be implemented at BESⅢ/BEPCⅡ or CLEOc.

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