STI Publications - View Publication Form #16043
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Publication Information
| Title | Kaon Photoproduction and the Lambda Decay Parameter alpha_ | ||||
| Abstract | The weak decay parameter $\alpha_-$ of the $\Lambda$ is an important quantity for the extraction of polarization observables in various experiments. Moreover, in combination with $\alpha_+$ from $\bar\Lambda$ decay it provides a measure for the matter-antimatter asymmetry. The weak decay parameter also affects the decay parameters of the $\Xi$ and $\Omega$ baryons and, in general, any quantity in which the polarization of the $\Lambda$ is relevant. The recently reported value by the BESIII collaboration of $0.750(9)(4)$ is significantly larger than the current PDG value of $0.642(13)$. In this work we make an independent estimate of $\alpha_-$, using an extensive set of polarization data measured in kaon photoproduction in the baryon resonance region and constraints set by spin algebra. The obtained value is 0.721(6)(5). The result is corroborated by multiple statistical tests as well as a modern phenomenological model, showing that our new value yields the best description of the data | ||||
| Author(s) | David Ireland, Michael Doring, Derek Glazier, J. Haidenbauer, Maxim Mai, R. Murray-Smith, D. Ronchen | ||||
| Publication Date | October 2019 | ||||
| Document Type | Journal Article | ||||
| Primary Institution | Thomas Jefferson National Accelerator Facility, Newport News | ||||
| Affiliation | Theory & Comp Physics / THEORY CENTER / THEORY CENTER | ||||
| Funding Source | Nuclear Physics (NP) | ||||
| Proprietary? | No | ||||
| This publication conveys | Technical Science Results | ||||
| Document Numbers |
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| Associated with an experiment | No | ||||
| Associated with EIC | No | ||||
| Supported by Jefferson Lab LDRD Funding | No |
Journal Article
| Journal Name | Physical Review Letters |
| Refereed | Yes |
| Volume | 123 |
| Issue | |
| Page(s) | 182301 |
Attachments/Datasets/DOI Link
| Document(s) |
1904.07616.pdf
(STI Document)
1904.07616(1).pdf
(Accepted Manuscript)
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| DOI Link | |
| Dataset(s) | (none) |
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