dorsal/arxiv
View SchemaPi-mesonic decay of the hypertriton
| Authors | H. Kamada, J. Golak, K. Miyagawa, H. Witala, W. Gloeckle |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9709035 |
| URL | https://arxiv.org/abs/nucl-th/9709035 |
| DOI | 10.1103/PhysRevC.57.1595 |
| Journal | Phys.Rev.C57:1595-1603,1998 |
Abstract
The pi-mesonic decay of the hypertriton is calculated based on a hypertriton wavefunction and 3N scattering states, which are rigorous solutions of 3-body Faddeev equations using realistic NN and hyperon-nucleon interactions. The total pi-mesonic decay rate is found to be 92% of the free Lambda decay rate, which is close to the experimental data. Together with the nonmesonic decay the total life time of 3Lambda H is predicted to be 2.78 x 10^-10 sec which is 6 % larger than for the free Lambda particle. The differential decay rate is evaluated as a function of the pion momentum. The decay into the N+d+pi channel is stronger than in the 3N+pi channel in contrast to the situation for the nonmesonic decay. The ratio for the decay rate into 3He + pi^- to the decay rate into all channels including pi^- is found to be 0.40, which is close to the experimental value. We visualise the decay into the dominant channel p+d+pi^- in a Dalitz plot. Finally we compare the polarisation of the outgoing proton in free unpolarised Lambda-decay to the polarisation of 3He in unpolarised 3_Lambda H-decay and we compare the closely related asymmetry of pi^- emitted parallel and antiparallel with respect to the spin-direction for a polarised Lambda to the corresponding asymmetry for a polarised 3_Lambda H.
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"abstract": "The pi-mesonic decay of the hypertriton is calculated based on a hypertriton\nwavefunction and 3N scattering states, which are rigorous solutions of 3-body\nFaddeev equations using realistic NN and hyperon-nucleon interactions. The\ntotal pi-mesonic decay rate is found to be 92% of the free Lambda decay rate,\nwhich is close to the experimental data. Together with the nonmesonic decay the\ntotal life time of 3Lambda H is predicted to be 2.78 x 10^-10 sec which is 6 %\nlarger than for the free Lambda particle. The differential decay rate is\nevaluated as a function of the pion momentum. The decay into the N+d+pi channel\nis stronger than in the 3N+pi channel in contrast to the situation for the\nnonmesonic decay. The ratio for the decay rate into 3He + pi^- to the decay\nrate into all channels including pi^- is found to be 0.40, which is close to\nthe experimental value. We visualise the decay into the dominant channel\np+d+pi^- in a Dalitz plot. Finally we compare the polarisation of the outgoing\nproton in free unpolarised Lambda-decay to the polarisation of 3He in\nunpolarised 3_Lambda H-decay and we compare the closely related asymmetry of\npi^- emitted parallel and antiparallel with respect to the spin-direction for a\npolarised Lambda to the corresponding asymmetry for a polarised 3_Lambda H.",
"arxiv_id": "nucl-th/9709035",
"authors": [
"H. Kamada",
"J. Golak",
"K. Miyagawa",
"H. Witala",
"W. Gloeckle"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.57.1595",
"journal_ref": "Phys.Rev.C57:1595-1603,1998",
"title": "Pi-mesonic decay of the hypertriton",
"url": "https://arxiv.org/abs/nucl-th/9709035"
},
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