Decay of the Λ(1405) hyperon to Σ0π0 measured at GlueX
Among the light baryons, the Jπ = 1/2− Λ(1405) hyperon is an important special case as it sits just below the N K̅ threshold and decays almost exclusively to Σπ. Some long-standing hypotheses for Λ(1405) are that it could be a N K̅ bound state or a Σπ continuum resonance. It may also be considered a...
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| Format: | Article |
| Language: | English |
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EDP Sciences
2022-01-01
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| Series: | EPJ Web of Conferences |
| Online Access: | https://www.epj-conferences.org/articles/epjconf/pdf/2022/15/epjconf_hyp2022_07005.pdf |
| _version_ | 1811218975127764992 |
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| author | Wickramaarachchi Nilanga Schumacher Reinhard A. Kalicy Grzegorz |
| author_facet | Wickramaarachchi Nilanga Schumacher Reinhard A. Kalicy Grzegorz |
| author_sort | Wickramaarachchi Nilanga |
| collection | DOAJ |
| description | Among the light baryons, the Jπ = 1/2− Λ(1405) hyperon is an important special case as it sits just below the N K̅ threshold and decays almost exclusively to Σπ. Some long-standing hypotheses for Λ(1405) are that it could be a N K̅ bound state or a Σπ continuum resonance. It may also be considered as a simple quark-model resonance, the P-wave companion of the Λ(1520). In recent years chiral unitary models have suggested that there are two isospin zero poles present in this mass region, and that the “line shape" of the Λ(1405) depends to what extent each of the two poles are stimulated in a given reaction. Below the N K̅ threshold, the Λ(1405) decays to the three Σπ charge combinations. The Σ0π0 mode is purely I = 0 and it is uncontaminated by complications arising from I = 1 scattering processes contributing to the reaction mechanism in the Σ+π− and Σ−π+ decays. It is also not affected from production and decay of the nearby Σ0(1385) hyperon. The GlueX experiment at Jefferson Lab has been used to study the Λ(1405) → Σ0π0 decay mode. We focus on the preliminary results of dσ/dMΣ0π0 and fits to the line shape of the Λ(1405) region in the −(t − tmin) range 0 - 1.5 GeV2 from analyzing the reaction γp → K+Λ* using the data collected during the first phase of the GlueX program. |
| first_indexed | 2024-04-12T07:18:05Z |
| format | Article |
| id | doaj.art-240b3289ab9346d090683554ed9b3b3b |
| institution | Directory Open Access Journal |
| issn | 2100-014X |
| language | English |
| last_indexed | 2024-04-12T07:18:05Z |
| publishDate | 2022-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj.art-240b3289ab9346d090683554ed9b3b3b2022-12-22T03:42:25ZengEDP SciencesEPJ Web of Conferences2100-014X2022-01-012710700510.1051/epjconf/202227107005epjconf_hyp2022_07005Decay of the Λ(1405) hyperon to Σ0π0 measured at GlueXWickramaarachchi Nilanga0Schumacher Reinhard A.1Kalicy Grzegorz2The Catholic University of AmericaCarnegie Mellon UniversityThe Catholic University of AmericaAmong the light baryons, the Jπ = 1/2− Λ(1405) hyperon is an important special case as it sits just below the N K̅ threshold and decays almost exclusively to Σπ. Some long-standing hypotheses for Λ(1405) are that it could be a N K̅ bound state or a Σπ continuum resonance. It may also be considered as a simple quark-model resonance, the P-wave companion of the Λ(1520). In recent years chiral unitary models have suggested that there are two isospin zero poles present in this mass region, and that the “line shape" of the Λ(1405) depends to what extent each of the two poles are stimulated in a given reaction. Below the N K̅ threshold, the Λ(1405) decays to the three Σπ charge combinations. The Σ0π0 mode is purely I = 0 and it is uncontaminated by complications arising from I = 1 scattering processes contributing to the reaction mechanism in the Σ+π− and Σ−π+ decays. It is also not affected from production and decay of the nearby Σ0(1385) hyperon. The GlueX experiment at Jefferson Lab has been used to study the Λ(1405) → Σ0π0 decay mode. We focus on the preliminary results of dσ/dMΣ0π0 and fits to the line shape of the Λ(1405) region in the −(t − tmin) range 0 - 1.5 GeV2 from analyzing the reaction γp → K+Λ* using the data collected during the first phase of the GlueX program.https://www.epj-conferences.org/articles/epjconf/pdf/2022/15/epjconf_hyp2022_07005.pdf |
| spellingShingle | Wickramaarachchi Nilanga Schumacher Reinhard A. Kalicy Grzegorz Decay of the Λ(1405) hyperon to Σ0π0 measured at GlueX EPJ Web of Conferences |
| title | Decay of the Λ(1405) hyperon to Σ0π0 measured at GlueX |
| title_full | Decay of the Λ(1405) hyperon to Σ0π0 measured at GlueX |
| title_fullStr | Decay of the Λ(1405) hyperon to Σ0π0 measured at GlueX |
| title_full_unstemmed | Decay of the Λ(1405) hyperon to Σ0π0 measured at GlueX |
| title_short | Decay of the Λ(1405) hyperon to Σ0π0 measured at GlueX |
| title_sort | decay of the λ 1405 hyperon to σ0π0 measured at gluex |
| url | https://www.epj-conferences.org/articles/epjconf/pdf/2022/15/epjconf_hyp2022_07005.pdf |
| work_keys_str_mv | AT wickramaarachchinilanga decayofthel1405hyperontos0p0measuredatgluex AT schumacherreinharda decayofthel1405hyperontos0p0measuredatgluex AT kalicygrzegorz decayofthel1405hyperontos0p0measuredatgluex |