التفاصيل البيبلوغرافية
| العنوان: |
Radiative decays of the spin-2 partner of X(3872). |
| المؤلفون: |
Shi, Pan-Pan1,2 (AUTHOR) shipanpan@itp.ac.cn, Dias, Jorgivan M.1 (AUTHOR) jorgivan.mdias@itp.ac.cn, Guo, Feng-Kun1,2,3 (AUTHOR) fkguo@itp.ac.cn |
| المصدر: |
Physics Letters B. Aug2023, Vol. 843, pN.PAG-N.PAG. 1p. |
| مصطلحات موضوعية: |
*BOUND states |
| مستخلص: |
It has been generally expected that the X (3872) has a spin-2 partner, X 2 , with quantum numbers J P C = 2 + +. In the hadronic molecular model, its mass was predicted to be below the D ⁎ D ¯ ⁎ threshold, and the new structure reported in the γ ψ (2 S) invariant mass distribution by the Belle Collaboration with mass M = (4014.3 ± 4.0 ± 1.5) MeV and decay width Γ = (4 ± 11 ± 6) MeV, with a global significance of 2.8 σ , is a nice candidate for it. We consider the radiative decay widths for the X 2 → γ ψ with ψ = J / ψ , ψ (2 S) treating the X 2 as a D ⁎ D ¯ ⁎ shallow bound state, and estimate the events of X 2 in two-photon collisions that can be collected in the γ J / ψ → γ ℓ + ℓ − (ℓ = e , μ) final states at Belle. Based on the upper limit for the ratio of decay widths of X (3872) → γ ψ (2 S) and X (3872) → γ J / ψ measured by BESIII, we predict the similar ratio Γ (X 2 → γ ψ (2 S)) / Γ (X 2 → γ J / ψ) to be smaller than 1.0. We suggest searching for the X 2 signal in the γ J / ψ invariant mass distribution via two-photon fusions. The results will lead to insights into both the X (3872) and the new structure observed by Belle. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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