Proposal for PAC 52: Measurement of $α_-$ for $Λ\rightarrow pπ^-$
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arXiv
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| Auteurs principaux: | , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866909188098097152 |
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| author | Hurck, Peter Glazier, Derek I. Ireland, David G. Livingston, Ken Afzal, Farah Thiel, Annika Wunderlich, Yannick Crede, Volker Dalton, Mark M. |
| author_facet | Hurck, Peter Glazier, Derek I. Ireland, David G. Livingston, Ken Afzal, Farah Thiel, Annika Wunderlich, Yannick Crede, Volker Dalton, Mark M. |
| contents | We propose to measure the weak decay constant $α_-$ for the decay $Λ\rightarrow pπ^-$ using a both circularly and linearly polarized photon beam with the GlueX spectrometer in Hall D. The measurement will take advantage of the fact that a measurement with both linear and circular photon beam polarization results in an over-constrained set of amplitudes which can be fitted to data and used to extract $α_-$ which will be left as a free parameter in the fit. We expect to determine $α_-$ with statistical uncertainties comparable to existing measurements and independent systematic uncertainties. This measurement can be performed alongside GlueX-II running and requires no new hardware or new beam time. The measurement requires that a sufficient fraction of the electron beam polarization be longitudinal in the Hall D tagger. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_01288 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Proposal for PAC 52: Measurement of $α_-$ for $Λ\rightarrow pπ^-$ Hurck, Peter Glazier, Derek I. Ireland, David G. Livingston, Ken Afzal, Farah Thiel, Annika Wunderlich, Yannick Crede, Volker Dalton, Mark M. Nuclear Experiment High Energy Physics - Experiment We propose to measure the weak decay constant $α_-$ for the decay $Λ\rightarrow pπ^-$ using a both circularly and linearly polarized photon beam with the GlueX spectrometer in Hall D. The measurement will take advantage of the fact that a measurement with both linear and circular photon beam polarization results in an over-constrained set of amplitudes which can be fitted to data and used to extract $α_-$ which will be left as a free parameter in the fit. We expect to determine $α_-$ with statistical uncertainties comparable to existing measurements and independent systematic uncertainties. This measurement can be performed alongside GlueX-II running and requires no new hardware or new beam time. The measurement requires that a sufficient fraction of the electron beam polarization be longitudinal in the Hall D tagger. |
| title | Proposal for PAC 52: Measurement of $α_-$ for $Λ\rightarrow pπ^-$ |
| topic | Nuclear Experiment High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2405.01288 |