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Author  |
Li, Y.Y.; Song, J.; Oset, E.; Liang, W.H.; Molina, R. |
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Title |
The Λc plus →Λπ plus π plus π- reaction, and a triangle singularity producing the Σ* state |
Type |
Journal Article |
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Year |
2025 |
Publication |
European Physical Journal C |
Abbreviated Journal |
Eur. Phys. J. C |
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Volume |
85 |
Issue |
9 |
Pages |
1086 - 12pp |
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Abstract |
We study the decay Lambda c+->Lambda pi+pi+pi-, focusing on the production of the Sigma*(1430) resonance observed by the Belle Collaboration. Interpreted as a dynamically generated state from meson-baryon interactions in the chiral unitary approach, the Sigma*(1430) signal is shown to be enhanced by a triangle singularity involving intermediate K*-, p, and K0 states. This mechanism leads to a sharp peak near 1434 MeV in the pi+Lambda invariant mass distribution, in agreement with the experimental observations, and predicts a secondary peak around 1875 MeV in the pi-Sigma*(1430) spectrum tied to the triangle singularity. We also estimate the branching ratio of Lambda c+->pi+pi-Sigma*(1430) to be about 3.5x10-4. The results for the branching ratio and the pi-Sigma*(1430) mass distributions are predictions of the theoretical approach, which could be tested with reanalysis of existing data. |
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Address |
[Li, Yi-Yao] South China Normal Univ, Inst Quantum Matter, State Key Lab Nucl Phys & Technol, Guangzhou 510006, Peoples R China, Email: Song-Jing@buaa.edu.cn; |
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Publisher |
Springer |
Place of Publication |
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Language |
English |
Summary Language |
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Original Title |
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Series Editor |
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Series Title |
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Series Volume |
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Edition |
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ISSN |
1434-6044 |
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Conference |
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Notes |
WOS:001586138500008 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6894 |
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