dorsal/arxiv
View SchemaCan only flavor-nonsinglet H dibaryons be stable against strong decays?
| Authors | Stathes D. Paganis, Takeshi Udagawa, G. W. Hoffmann, R. L. Ray |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9706050 |
| URL | https://arxiv.org/abs/nucl-th/9706050 |
| DOI | 10.1103/PhysRevC.56.570 |
| Journal | Phys.Rev.C56:570-573,1997 |
Abstract
Using the QCD sum rule approach, we show that the flavor-nonsinglet $H$ dibaryon states with J$^{\pi} = 1^+$, J$^{\pi} = 0^+$, I=1 (27plet) are nearly degenerate with the J$^{\pi} = 0^+$, I=0 singlet $H_0$ dibaryon, which has been predicted to be stable against strong decay, but has not been observed. Our calculation, which does not require an instanton correction, suggests that the $H_0$ is slightly heavier than these flavor-nonsinglet $H$s over a wide range of the parameter space. If the singlet $H_0$ mass lies above the $\Lambda \Lambda$ threshold (2231~MeV), then the strong interaction breakup to $\Lambda \Lambda$ would produce a very broad resonance in the $\Lambda \Lambda$ invariant mass spectrum which would be very difficult to observe. On the other hand, if these flavor-nonsinglet J=0 and 1 $H$ dibaryons are also above the $\Lambda \Lambda$ threshold, but below the $\Xi^0n$ breakup threshold (2254 MeV), then because the direct, strong interaction decay to the $\Lambda \Lambda$ channel is forbidden, these flavor-nonsinglet states might be more amenable to experimental observation. The present results allow a possible reconciliation between the reported observation of $\Lambda \Lambda$ hypernuclei, which argue against a stable $H_0$, and the possible existence of $H$ dibaryons in general.
{
"annotation_id": "5aaffbc7-2e5e-4d9a-8717-28f031c051da",
"date_created": "2026-03-02T18:00:18.396000Z",
"date_modified": "2026-03-02T18:00:18.396000Z",
"file_hash": "62a92ed72a022d70468b6486934ee02162675db8fd59ee622c4f42580e54f574",
"private": false,
"record": {
"abstract": "Using the QCD sum rule approach, we show that the flavor-nonsinglet $H$\ndibaryon states with J$^{\\pi} = 1^+$, J$^{\\pi} = 0^+$, I=1 (27plet) are nearly\ndegenerate with the J$^{\\pi} = 0^+$, I=0 singlet $H_0$ dibaryon, which has been\npredicted to be stable against strong decay, but has not been observed. Our\ncalculation, which does not require an instanton correction, suggests that the\n$H_0$ is slightly heavier than these flavor-nonsinglet $H$s over a wide range\nof the parameter space. If the singlet $H_0$ mass lies above the $\\Lambda\n\\Lambda$ threshold (2231~MeV), then the strong interaction breakup to $\\Lambda\n\\Lambda$ would produce a very broad resonance in the $\\Lambda \\Lambda$\ninvariant mass spectrum which would be very difficult to observe. On the other\nhand, if these flavor-nonsinglet J=0 and 1 $H$ dibaryons are also above the\n$\\Lambda \\Lambda$ threshold, but below the $\\Xi^0n$ breakup threshold (2254\nMeV), then because the direct, strong interaction decay to the $\\Lambda\n\\Lambda$ channel is forbidden, these flavor-nonsinglet states might be more\namenable to experimental observation. The present results allow a possible\nreconciliation between the reported observation of $\\Lambda \\Lambda$\nhypernuclei, which argue against a stable $H_0$, and the possible existence of\n$H$ dibaryons in general.",
"arxiv_id": "nucl-th/9706050",
"authors": [
"Stathes D. Paganis",
"Takeshi Udagawa",
"G. W. Hoffmann",
"R. L. Ray"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.56.570",
"journal_ref": "Phys.Rev.C56:570-573,1997",
"title": "Can only flavor-nonsinglet H dibaryons be stable against strong decays?",
"url": "https://arxiv.org/abs/nucl-th/9706050"
},
"schema_id": "dorsal/arxiv",
"source": {
"execution_id": "a006c81c-61f1-4403-afbc-9a4072dbffd5",
"id": "arXiv Dataset IDs",
"type": "Model",
"variant": "snapshot-2026-03-01",
"version": "0.1.0"
},
"user_id": 1000002
}