## Օբյեկտ

### Վերնագիր: The Helicity E-asymmetry of the $\vec \gamma \vec N \to \pi N$ reaction in the $\Delta$(1232)-resonance region

#### Ամփոփում:

The helicity $E$-asymmetry of the reaction $\gamma (N, \pi)N$ by using polarized photon beams and polarized nucleon targets in the $\Delta$-resonance region is investigated. This asymmetry is an adequate observable to test the weakness in the pion photoproduction model, since it is sensitive to small but important amplitudes. We present results for the $E$-asymmetry as a function of pion angle at different photon lab energies and compare them with available experimental data. The isobar model MAID-2007 and an Effective Lagrangian Approach (ELA) are used to analyze the recent data from CLAS experiment. A satisfactory agreement between ELA and MAID-2007 models with the CLAS data is found in the case of $\gamma (p , \pi^0)p$ reaction

#### Նույնացուցիչ:

oai:arar.sci.am:23420

Sep 4, 2020

Feb 27, 2020

0

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