The 24th International Spin Symposium

Session

Low energy spin physics with lepton, photon and hadron probes

lowene

21 Oct 2021, 07:00

Matsue, Shimane Prefecture, Japan

Conveners

Low energy spin physics with lepton, photon and hadron probes

• Atsushi Tamii (Research Center for Nuclear Physics)
• Hideki Kohri (RCNP, Osaka University)

192. Search for the H-dibaryon near $\Lambda\Lambda$ and $\Xi^{-}p$ thresholds via $^{12}$C$(K^-,K^+)$ reactions at J-PARC

Dr Shin Hyung Kim (Korea University)

21/10/2021, 07:00

Low energy spin physics with lepton, photon and hadron probes

Parallel Session keynote talk (by invitation only)

The J-PARC E42 is a dedicated experiment to search for an H-dibaryon near $\Lambda\Lambda$ and $\Xi^{-}p$ threshold. The H-dibaryon is the lightest $S=−2$ system which can be decomposed into a symmetric six-quark object made from $\textit{uuddss}$ quarks and two baryon states involving $\Lambda\Lambda$, $\Xi N$, and $\Sigma\Sigma$ components. E42 detector is highlighted by a large-acceptance...

191. Differential cross sections and photon beam asymmetries of eta photoproduction on the proton in the LEPS2/BGOegg experiment

Toshikazu HASHIMOTO (Research Center for Nuclear Physics, Osaka University)

21/10/2021, 07:30

Low energy spin physics with lepton, photon and hadron probes

Parallel Session Presentation

The meson photoproduction is a useful tool to study baryon resonances.Especially, an $\eta$ meson is an isoscalar meson with $s\bar{s}$ components, so it is expected to couple with $\mathrm{N}^{*}$ states with large $s\bar{s}$ components. In previous experiments, the bump structure was seen above 2 GeV in differential cross sections of $\eta$ photoproduction. But in this energy region, many...

152. Spin effects in low-energy electron-nucleon scattering with two-photon exchange: Analysis based on 1/N_c expansion of QCD

Cintia Willemyns (University of Mons)

21/10/2021, 07:50

Low energy spin physics with lepton, photon and hadron probes

Parallel Session Presentation

The transverse single-spin asymmetry in inclusive electron-nucleon scattering, e + N(S_T) -> e’ + X, represents a pure two-photon exchange observable and is of fundamental interest for exploring higher-order QED effects in electron scattering. We compute this observable in the resonance region, where excitation of Delta isobars occurs in both intermediate and final states. We employ a novel...

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

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

21/10/2021, 08:10

Low energy spin physics with lepton, photon and hadron probes

Parallel Session Presentation

The $\eta d$ threshold structure $\mathcal{D}_{\eta d}$ with a spin parity of $1^-$ has been experimentally studied in the $\gamma d \to \pi^0 \eta d$ reaction at $E_\gamma \lt 1.15$ 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...