Polarization Observables $T$ and $F$ in the $γp \to π^0 p$ Reaction at CLAS
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911119668412416 |
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| author | Jiang, H. Strauch, S. Strakovsky, I. I. Rönchen, D. Workman, R. Collaboration, The CLAS |
| author_facet | Jiang, H. Strauch, S. Strakovsky, I. I. Rönchen, D. Workman, R. Collaboration, The CLAS |
| contents | Pion photoproduction in the $\overrightarrowγ\overrightarrow p \to π^0 p$ reaction has been measured in the FROST experiment at the Thomas Jefferson National Accelerator Facility. In this experiment, circularly polarized photons with energies up to 3.082 GeV impinged on a transversely polarized frozen-spin target. Final-state protons were detected in the CEBAF Large Acceptance Spectrometer. Results of the polarization observables $T$ and $F$ have been extracted for $W$ from 1445 MeV to 2525 MeV. The data generally agree with predictions of present partial-wave analyses, but also show marked differences for higher $W$ ranges. By incorporating the present data into the databases, the SAID fits have been improved with relatively small $χ^2$ and significant changes in the parameters of the $Δ(1910)1/2^+$ and $N(2190)7/2^-$ have been found with the JüBo model. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2508_17589 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Polarization Observables $T$ and $F$ in the $γp \to π^0 p$ Reaction at CLAS Jiang, H. Strauch, S. Strakovsky, I. I. Rönchen, D. Workman, R. Collaboration, The CLAS Nuclear Experiment Pion photoproduction in the $\overrightarrowγ\overrightarrow p \to π^0 p$ reaction has been measured in the FROST experiment at the Thomas Jefferson National Accelerator Facility. In this experiment, circularly polarized photons with energies up to 3.082 GeV impinged on a transversely polarized frozen-spin target. Final-state protons were detected in the CEBAF Large Acceptance Spectrometer. Results of the polarization observables $T$ and $F$ have been extracted for $W$ from 1445 MeV to 2525 MeV. The data generally agree with predictions of present partial-wave analyses, but also show marked differences for higher $W$ ranges. By incorporating the present data into the databases, the SAID fits have been improved with relatively small $χ^2$ and significant changes in the parameters of the $Δ(1910)1/2^+$ and $N(2190)7/2^-$ have been found with the JüBo model. |
| title | Polarization Observables $T$ and $F$ in the $γp \to π^0 p$ Reaction at CLAS |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2508.17589 |