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Author  |
Li, H.P.; Liang, W.H.; Xiao, C.W.; Oset, E. |
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Title |
a0(980) production, triangle singularity, and non-φ background in the J/ψ-* φηπ0 reaction |
Type |
Journal Article |
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Year |
2026 |
Publication |
Physical Review D |
Abbreviated Journal |
Phys. Rev. D |
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Volume |
113 |
Issue |
5 |
Pages |
054028 - 14pp |
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Abstract |
We study the J/psi -* phi eta pi 0 reaction measured recently by the BESIII Collaboration with high precision, paying attention to three important aspects: (1) the production of the a0(980) in the pi 0 eta mass distributions, with the typical narrow width observed in isospin violating processes; (2) the origin of two peaks in the phi pi 0 mass distributions that were branded as “non-phi” contribution in the experimental analysis; (3) the existence of two triangle mechanisms developing a triangle singularity at the same energy where the non-phi contribution peaks in the experiment. However, we also show that the strength of these peaks is very small relative to the observed ones, a feature that is tied to the experimental technique used to identify the phi looking at K & thorn;K- in a narrow window of invariant mass around the phi mass. We suggest that these triangle singularities could be observed with other methods to identify the phi. |
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Address |
[Li, Hai-Peng; Liang, Wei-Hong; Xiao, Chu-Wen; Oset, Eulogio] Guangxi Normal Univ, Dept Phys, Guilin 541004, Peoples R China, Email: liangwh@gxnu.edu.cn; |
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Publisher |
Amer Physical Soc |
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Language |
English |
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Original Title |
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Series Volume |
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Edition |
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ISSN |
2470-0010 |
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Notes |
WOS:001721885700001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7152 |
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