NSTAR 2022

Beam asymmetry of the photoproduction of the ω meson off bound protons in CLAS

19 Oct 2022, 17:20

20m

Santa Margherita Ligure

Polarization observables photo- and electro- production of mesons off nucleons Parallel 3

Speaker

Olga Cortes Becerra (The George Washington University)

Description

Our research contributes to a larger experimental program that seeks to shed light on the evolving status of the proton spectrum. Determining the hadronic spectrum is a complicated task due to the high number of excited states of the nucleon, all of which have large widths causing resonances to overlap. Also, these resonances may decay into a multitude of decay channels.

In this talk, we focus on the photoproduction of $\omega$ mesons off the bound proton in the deuterium which is a significant channel for several reasons. First, the $\omega$ meson being isospin 0 acts as an isospin filter, providing us information specifically about $N^{\ast }$ resonances. Second, since its threshold is above the $\pi$ and $\eta$ photoproduction thersholds, it should give information for higher mass resonances. Third, by studying production on protons bound in deuterium will also help with a greater understanding of the quasi-free events, which is of vital importance for the study of reactions with a bound neutron target.We present preliminary results for the quasi-free $\overrightarrow{\gamma }d\to \omega p(n)$ photon beam asymmetry polarization observable. The data where taken with the CLAS detector in Hall B at the Thomas Jefferson National Accelerator Laboratory (JLab). The experiment provided high-quality beam of linearly-polarized photons in the energy range from 1.1 to 2.3 GeV.

This work was supported by the U.S. National Science Foundation NSF PHY-1307340 and NSF-PHY-1615146 and the U.S. Department of Energy Office of Science, Office of Nuclear Physics, under contract contract no. DE-SC0016583

Presentation materials

CortesBecerra_NSTAR2022.pdf