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25 April 2024 |
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Interpretation of the $η_1(1855)$ as a $Kar K_1(1400)+$ c.c. molecule | | Xiang-Kun Dong
; Yong-Hui Lin
; Bing-Song Zou
; | | Date: |
2 Feb 2022 | | Abstract: | An exotic state with $J^{PC}=1^{-+}$, denoted as $eta_1(1855)$, was observed
by BESIII collaboration recently in $J/psi o gamma etaeta’$. The fact
that its mass is just below the threshold of $Kar K_1(1400)$ stimulates us to
investigate whether this exotic state can be interpreted as a $Kar
K_1(1400)+$ c.c. Using the one meson exchange model, we show that it is
possible for $Kar K_1(1400)$ with $J^{PC}=1^{-+}$ to bind together by taking
the momentum cutoff $Lambdagtrsim 2$ GeV and yield the same binding energy as
the experimental value when $Lambdaapprox 2.5$ GeV. In this molecular
picture, the predicted branch ratio $mathrm{Br}(eta_1(1855) oetaeta’)
approx 15\%$ is consistent with the experimental results, which again supports
the molecular explanation of $eta_1(1855)$. Relevant systems, namely $Kar
K_1(1400)$ with $J^{PC}=1^{--}$ and $Kar K_1(1270)$ with $J^{PC}=1^{-pm}$
are also investigated, some of which can be searched for in the future
experiments. | | Source: | arXiv, 2202.00863 | | Services: | Forum | Review | PDF | Favorites | |
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