### Abstract

Beam polarization asymmetries for the [Formula presented] and [Formula presented] reactions are measured for the first time for [Formula presented] and [Formula presented] by using linearly polarized photons at the Laser-Electron-Photon facility at SPring-8 (LEPS). The observed asymmetries are positive and gradually increase with rising photon energy. The data are not consistent with theoretical predictions based on tree-level effective-Lagrangian approaches. Including the new results in the development of the models is, therefore, crucial for understanding the reaction mechanism and to test the presence of baryon resonances which are predicted in quark models but are thus far undiscovered.

Original language | English |
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Journal | Physical Review Letters |

Volume | 91 |

Issue number | 9 |

DOIs | |

Publication status | Published - 2003 Aug 26 |

Externally published | Yes |

### ASJC Scopus subject areas

- Physics and Astronomy(all)

## Fingerprint Dive into the research topics of 'Beam-Polarization Asymmetries for the [Formula presented] and [Formula presented] Reactions for [Formula presented]'. Together they form a unique fingerprint.

## Cite this

*Physical Review Letters*,

*91*(9). https://doi.org/10.1103/PhysRevLett.91.092001