Searching for a $P_{cs}(4200)$ state in the $Λ_b\toϕη_cΛ$ reaction
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866914529883979776 |
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| author | Lyu, Wen-Tao Oset, Eulogio |
| author_facet | Lyu, Wen-Tao Oset, Eulogio |
| contents | We propose the $Λ_b\toϕη_c Λ$ reaction to observe a $P_{cs}$ state around $4200$ MeV, predicted at lower masses than expected from comparison with the $P_c$ states, stemming as a consequence of the important role played by coupled channels in the $P_{cs}$ case, which does not appear in the $P_c$ case. That state decays to $η_c Λ$ with a width of about $200$ keV. The reaction is related to $Λ_b^0\toϕD_s^- Λ_c^+$, which has already been observed. We predict a branching fraction for $Λ_b\toϕP_{cs}(4200)$; $P_{cs}\toη_c Λ$ of the order of $10^{-5}$, which is within present capabilities of the LHCb collaboration. The observation of this state would bring valuable light on the nature of the $P_c$ and $P_{cs}$ states and the role played by coupled channels in hadron structure and hadron reactions. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2601_20630 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Searching for a $P_{cs}(4200)$ state in the $Λ_b\toϕη_cΛ$ reaction Lyu, Wen-Tao Oset, Eulogio High Energy Physics - Phenomenology We propose the $Λ_b\toϕη_c Λ$ reaction to observe a $P_{cs}$ state around $4200$ MeV, predicted at lower masses than expected from comparison with the $P_c$ states, stemming as a consequence of the important role played by coupled channels in the $P_{cs}$ case, which does not appear in the $P_c$ case. That state decays to $η_c Λ$ with a width of about $200$ keV. The reaction is related to $Λ_b^0\toϕD_s^- Λ_c^+$, which has already been observed. We predict a branching fraction for $Λ_b\toϕP_{cs}(4200)$; $P_{cs}\toη_c Λ$ of the order of $10^{-5}$, which is within present capabilities of the LHCb collaboration. The observation of this state would bring valuable light on the nature of the $P_c$ and $P_{cs}$ states and the role played by coupled channels in hadron structure and hadron reactions. |
| title | Searching for a $P_{cs}(4200)$ state in the $Λ_b\toϕη_cΛ$ reaction |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2601.20630 |