Radiative decays of low-lying excited-state hyperons
| dc.contributor.advisor | Mutchler, Gordon S. | |
| dc.creator | Taylor, Simon John | |
| dc.date.accessioned | 2009-06-04T08:29:06Z | |
| dc.date.available | 2009-06-04T08:29:06Z | |
| dc.date.issued | 2000 | |
| dc.description.abstract | The quark wave-functions of the lower-lying excited-state hyperons Λ(1405), Λ(1385), and Λ(1520) are not well understood. For example, the Λ(1405) may not be a regular three-quark state but K¯N molecule. Several competing models have been proposed, but none have been convincingly eliminated. Measuring radiative decays provides a means of discriminating between the models. The radiative branching ratios are predicted to be small (∼1%), but the radiative widths vary by factors of 2--10 from model to model. The existing experimental data is sparse and inconsistent; moreover, the radiative decay of the Sigma(1385) has never been observed before (except for one event). These lower-lying excited-state hyperons were produced in a tagged photon-beam experiment in the CLAS detector at TJNAF in the reaction gammap → K+Y* for photon energies from threshold to 2.4 GeV. The radiative branching ratio for the Sigma0(1385) relative to the Sigma0(1385) → Sigmapi0 channel was measured to be 0.021 +/- 0.008+0.004-0.007 corresponding to a partial width of 640 +/- 270+130-220 keV. | |
| dc.format.extent | 153 p. | en_US |
| dc.format.mimetype | application/pdf | |
| dc.identifier.callno | THESIS PHYS. 2000 TAYLOR | |
| dc.identifier.citation | Taylor, Simon John. "Radiative decays of low-lying excited-state hyperons." (2000) Diss., Rice University. <a href="https://hdl.handle.net/1911/19558">https://hdl.handle.net/1911/19558</a>. | |
| dc.identifier.uri | https://hdl.handle.net/1911/19558 | |
| dc.language.iso | eng | |
| dc.rights | Copyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder. | |
| dc.subject | Nuclear physics | |
| dc.title | Radiative decays of low-lying excited-state hyperons | |
| dc.type | Thesis | |
| dc.type.material | Text | |
| thesis.degree.department | Physics | |
| thesis.degree.discipline | Natural Sciences | |
| thesis.degree.grantor | Rice University | |
| thesis.degree.level | Doctoral | |
| thesis.degree.name | Doctor of Philosophy |
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