Experimental constraints on the properties of $P_c$ states
| Autor: | Burns, T. J., Swanson, E. S. |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Eur. Phys. J. A (2022) 58:68 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1140/epja/s10050-022-00723-9 |
| Popis: | Using new experimental data on photoproduction and $\Lambda_b^0$ decays, we derive constraints on the properties of the LHCb $P_c$ states. We conclude that $P_c(4312)$, $P_c(4380)$ and $P_c(4440)$ can be described as $\Sigma_c\bar D$, $\Sigma_c^*\bar D$ and $\Sigma_c\bar D^*$ molecules, but that $P_c(4457)$ does not fit into the same picture. Based on the apparent absence of additional partner states, and the striking disparity between $\Lambda_c^+\bar D^0$ and $\Lambda_c^+\bar D^{*0}$ decays, we conclude that $P_c(4440)$ has $3/2^-$ quantum numbers. Using heavy-quark symmetry we predict large experimental signals for $P_c$ states in $\eta_c p K^-$, $\Lambda_c^+\bar D^{*0}K^-$, and $\Sigma_c^{(*)}\bar D K^-$. We also argue that current experimental data on photoproduction is almost at the level of sensitivity required to observe $P_c$ states. Comment: 27 pages, 4 figures, minor revisions for journal |
| Databáze: | arXiv |
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