On the ηc Particle and Its Electromagnetic Decays

  • The mass,width and branching ratios of the ηc meson are estimated in the framework of a potential model.It is shown that it is possible for the width of the forbidden M1 transition ηc→J/ψγ to raise one order of magnitude after considering relativistic corrections is comparison with the non-relativistic result.The possibilities to measure the cascade electromagnetic radiation processes ψ′(3686)→γηc→γγ1P1,γγJ/ψ,3γ with BEPC are discussed.
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  • [1] For a recent review see W. kwong, J. L. Rosner and C. Quigg, Annu. iRev/i. iNucl/i. Part. Sci., 37(1987), 325;See also E. Eichten et al,iPhys/i. iRev/i., D21(1957), 203.[2] E. Eichten and F. Feinberg, iPhys/i. iRev/i.,D23(1981), 2724.[3] M. McClary and N. Byers, iPhys/i. iRev/i., D28(1983), 1692.[4] C. Edwards et al., iPhys/i. iRev/i. Leu., 48(1982), 70.[5] Y. B. Ding, J. He, S. O. Cai, D. H. Qin and K. T. Chao, in Proc. of the Int. Sym. On Particle and iNucl/iear iPhys/i., Seijing, Sept. 2-7, 1985. (World Scientific, Singapore) p. 88.[6] Particle Data Group, M. Aguilar-Benitez et al., iPhys/i, iLett/i., 239B(1990), 1.[7] Y. P. Kuang, in Proc, of Heavy Flavor iPhys/i. Sym, BIMP and Peking Univ., 11-20 Aug, 1988. (World Scen-tific,Singapore, 1989) p. 395; Y. P. Kuang, S. F. Tuan and T. M. Yan, iPhys/i, iRev/i., D37(1988), 1210.[8] H. Grotch, D. A. Owen, amd K. J. Sebastien, iPhys/i. iRev/i.,D30(1984), 1924.[9] V. Zambetakis and N. Byers, iPhys/i, iRev/i., D28(1983), 2908.[10] F. C. Poter,in Proc. Second Morsond Workshop on New Flavours at Les Ares,France, On Jun. 24-30, 1982. (ed. J. Tran,Thanh Van and L. Montanet, Editions Frontieres, Gif-Sur-Yvette,1982).[11] Y. B. Ding et al., To be published.
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DING Yi-Bing, QIN Dan-Hua, ZHAO Guang-Da and ZHOU Lei. On the ηc Particle and Its Electromagnetic Decays[J]. Chinese Physics C, 1991, 15(7): 584-590.
DING Yi-Bing, QIN Dan-Hua, ZHAO Guang-Da and ZHOU Lei. On the ηc Particle and Its Electromagnetic Decays[J]. Chinese Physics C, 1991, 15(7): 584-590. shu
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Received: 1900-01-01
Revised: 1900-01-01
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On the ηc Particle and Its Electromagnetic Decays

    Corresponding author: DING Yi-Bing,
  • Department of Physics,Graduate School,Academia Sinica,Beijing 1000392 Department of Physics,Peking University,Beijing 1008713 Theoretical Physics Institute,Academia Sinica,Beijing 1000804 CCAST World Laboratory

Abstract: The mass,width and branching ratios of the ηc meson are estimated in the framework of a potential model.It is shown that it is possible for the width of the forbidden M1 transition ηc→J/ψγ to raise one order of magnitude after considering relativistic corrections is comparison with the non-relativistic result.The possibilities to measure the cascade electromagnetic radiation processes ψ′(3686)→γηc→γγ1P1,γγJ/ψ,3γ with BEPC are discussed.

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