18–22 Oct 2021
Matsue, Shimane Prefecture, Japan
Asia/Tokyo timezone

Coherent neutral-pion and eta-meson photoproduction on the deuteron

21 Oct 2021, 08:10
20m
Room 401 (Kunibiki Messe)

Room 401

Kunibiki Messe

Parallel Session Presentation Low energy spin physics with lepton, photon and hadron probes Low energy spin physics with lepton, photon and hadron probes

Speaker

Takatsugu Ishikawa (Research Center for Electron Photon Science, Tohoku University)

Description

The ηd threshold structure Dηd with a spin parity of 1 has been experimentally studied in the γdπ0ηd reaction at Eγ<1.15 GeV. The structure is connected to the isoscalar S-wave two-body system between the nucleon N and nucleon resonance N(1535)1/2, or the chiral partner candidate of N. By incorporating the known isovector resonance D12 with a spin-parity of 2+ in the π0d channel, we decompose the ηd and π0d invariant-mass spectra into the ηD12 and π0Dηd contributions. From the analysis of π0 and η angular distributions, we determine the spin-parity of the first intermediate ηD12 and π0Dηd systems. The spin-parity of the major component is found to be 0 in the π0Dηd system, suggesting that some nucleon resonance contributes to π0η photoproduction on the nucleon. It should be noted that Δ(1700)3/2 is the main contributor for the elementary π0η photoproduction. The talk will be based on [T. Ishikawa et al., arXiv:2105.10887].

Primary author

Takatsugu Ishikawa (Research Center for Electron Photon Science, Tohoku University)

Presentation materials