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| Since the discovery of X(3872), its structure has beenin ceaseless dispute. The Belle and Babar collaborations havemeasured the decay rates of X(3872)->π+π-π0J/Ψ and the data suggest that X(3872) may be a high-spincharmonium of 2-+ instead of other exotic assignments.Recently the radiative decays of X(3872) which may explicitlydetermine the quantum number and structure of X(3872), have beenmeasured by the two collaborations. In terms of the light frontquark model (LFQM) we calculate the rates of the radiative decaysX(3872)->J/Ψ(Ψ')γ supposing X(3872) to bea 2-+ charmonium. Within this framework, our theoreticalprediction on mathcalR(X(3872)->Ψ(1S)γ) isat order of 10-3 which is slightly lower than the Babar'sdata but close to the Belle's. Instead, our prediction onBR(X(3872)->Ψ'γ) is at order of10-5 if psi is a pure 2S state or 10-4 if psi isa 2S-1D mixture, which does not conflict with the upper boundset by the Belle collaboration, but is much lower than the Babar'sdata, The future measurements will accurately determine thisbranching ratio, thus if the future measurement decides thebranching ratio of BR(X(3872)->Ψ'γ)to be much larger than 10-4, the assignment of 2-+ forX(3872) should be ruled out. Since the signal of the radiativedecay is clean, it is worth careful study from both experimentaland theoretical aspects. |
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| Keywords:particle physics; radiative decays; new particle |
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