Charmless decays of the spin-2 partner of X(3872)
Abstract The Belle collaboration recently reported a pro-mising candidate for the spin-2 $$D^*\bar{D}^*$$ D ∗ D ¯ ∗ partner of the X(3872), called the $$X_2$$ X 2 for short, having a mass of $$(4014.3 \pm 4.0 \pm 1.5)~\textrm{MeV}$$ ( 4014.3 ± 4.0 ± 1.5 ) MeV and a width of $$(4 \pm 11 \pm 6)~\textr...
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SpringerOpen
2024-10-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-024-13424-y |
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| author | Zu-Xin Cai Zhao-Sai Jia Gang Li Shi-Dong Liu Ju-Jun Xie |
| author_facet | Zu-Xin Cai Zhao-Sai Jia Gang Li Shi-Dong Liu Ju-Jun Xie |
| author_sort | Zu-Xin Cai |
| collection | DOAJ |
| description | Abstract The Belle collaboration recently reported a pro-mising candidate for the spin-2 $$D^*\bar{D}^*$$ D ∗ D ¯ ∗ partner of the X(3872), called the $$X_2$$ X 2 for short, having a mass of $$(4014.3 \pm 4.0 \pm 1.5)~\textrm{MeV}$$ ( 4014.3 ± 4.0 ± 1.5 ) MeV and a width of $$(4 \pm 11 \pm 6)~\textrm{MeV} $$ ( 4 ± 11 ± 6 ) MeV . In present work, we assume the $$X_2$$ X 2 as a pure molecule of the $$D^*\bar{D}^*$$ D ∗ D ¯ ∗ under four cases, i.e., pure neutral components ( $$\theta = 0$$ θ = 0 ), isospin singlet ( $$\theta = \pi /4$$ θ = π / 4 ), neutral components dominant ( $$\theta = \pi /6$$ θ = π / 6 ), and purely charged components ( $$\theta = \pi /2$$ θ = π / 2 ), where $$\theta $$ θ is a phase angle describing the proportion of neutral and charged constituents. Using an effective Lagrangian approach, we calculated the partial widths of $$X_2\rightarrow VV$$ X 2 → V V and $$X_2 \rightarrow PP$$ X 2 → P P (V and P stand for light vector and pseudoscalar mesons, respectively). The predicted decay widths of $$X_2 \rightarrow VV$$ X 2 → V V can reach a few hundreds of $$\textrm{keV}$$ keV , while the decay widths of $$X_2 \rightarrow PP$$ X 2 → P P are about several tens of $$\textrm{keV}$$ keV . In addition, the effects from the proportion of neutral and charged constituent on the decay widths of $$X_2\rightarrow VV$$ X 2 → V V and PP are also investigated. We hope that the present calculations will be checked experimentally in the future. |
| format | Article |
| id | doaj-art-0fb043602e364f77ac5397af2993ff0a |
| institution | Kabale University |
| issn | 1434-6052 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj-art-0fb043602e364f77ac5397af2993ff0a2024-12-08T12:43:04ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60522024-10-01841011110.1140/epjc/s10052-024-13424-yCharmless decays of the spin-2 partner of X(3872)Zu-Xin Cai0Zhao-Sai Jia1Gang Li2Shi-Dong Liu3Ju-Jun Xie4College of Physics and Engineering, Qufu Normal UniversityCollege of Physics and Engineering, Qufu Normal UniversityCollege of Physics and Engineering, Qufu Normal UniversityCollege of Physics and Engineering, Qufu Normal UniversityInstitute of Modern Physics, Chinese Academy of SciencesAbstract The Belle collaboration recently reported a pro-mising candidate for the spin-2 $$D^*\bar{D}^*$$ D ∗ D ¯ ∗ partner of the X(3872), called the $$X_2$$ X 2 for short, having a mass of $$(4014.3 \pm 4.0 \pm 1.5)~\textrm{MeV}$$ ( 4014.3 ± 4.0 ± 1.5 ) MeV and a width of $$(4 \pm 11 \pm 6)~\textrm{MeV} $$ ( 4 ± 11 ± 6 ) MeV . In present work, we assume the $$X_2$$ X 2 as a pure molecule of the $$D^*\bar{D}^*$$ D ∗ D ¯ ∗ under four cases, i.e., pure neutral components ( $$\theta = 0$$ θ = 0 ), isospin singlet ( $$\theta = \pi /4$$ θ = π / 4 ), neutral components dominant ( $$\theta = \pi /6$$ θ = π / 6 ), and purely charged components ( $$\theta = \pi /2$$ θ = π / 2 ), where $$\theta $$ θ is a phase angle describing the proportion of neutral and charged constituents. Using an effective Lagrangian approach, we calculated the partial widths of $$X_2\rightarrow VV$$ X 2 → V V and $$X_2 \rightarrow PP$$ X 2 → P P (V and P stand for light vector and pseudoscalar mesons, respectively). The predicted decay widths of $$X_2 \rightarrow VV$$ X 2 → V V can reach a few hundreds of $$\textrm{keV}$$ keV , while the decay widths of $$X_2 \rightarrow PP$$ X 2 → P P are about several tens of $$\textrm{keV}$$ keV . In addition, the effects from the proportion of neutral and charged constituent on the decay widths of $$X_2\rightarrow VV$$ X 2 → V V and PP are also investigated. We hope that the present calculations will be checked experimentally in the future.https://doi.org/10.1140/epjc/s10052-024-13424-y |
| spellingShingle | Zu-Xin Cai Zhao-Sai Jia Gang Li Shi-Dong Liu Ju-Jun Xie Charmless decays of the spin-2 partner of X(3872) European Physical Journal C: Particles and Fields |
| title | Charmless decays of the spin-2 partner of X(3872) |
| title_full | Charmless decays of the spin-2 partner of X(3872) |
| title_fullStr | Charmless decays of the spin-2 partner of X(3872) |
| title_full_unstemmed | Charmless decays of the spin-2 partner of X(3872) |
| title_short | Charmless decays of the spin-2 partner of X(3872) |
| title_sort | charmless decays of the spin 2 partner of x 3872 |
| url | https://doi.org/10.1140/epjc/s10052-024-13424-y |
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