Coherent photoproduction of two neutral pseudoscalar mesons on light nuclei

Egorov, M. V.

doi:10.1103/physrevc.101.065205

Cited by 11 publications

(22 citation statements)

References 42 publications

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“…The conclusions above applies also to the calculations presented in Ref. [72] (black curves in Fig. 4).…”

Section: B Total Cross Sectionsupporting

confidence: 79%

“…To obtain more information about the important mechanisms of the γd → π 0 ηd reaction, we have also measured the invariant-mass and angular distributions: dσ/dM πη , dσ/dM πd , dσ/dM ηd , and dσ/dΩ d in the energy bins E γ = 0.85-0.94, 0.95-1.01, and 1.01-1.15 GeV. The differential cross section dσ/dV i is given by 0 0.5 The black solid curves show the full calculations by Egorov [72] at Eγ = 0.90, 0.98, and 1.08 GeV in the bottom, center and top panels, respectively. The phase space is normalized so that the corresponding total cross section matches the measured one.…”

Section: Differential Cross Sectionsmentioning

confidence: 96%

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Coherent photoproduction of the neutral pion and eta meson on the deuteron at incident energies below 1.15 GeV

Ishikawa,

Fix,

Fujimura

et al. 2022

Preprint

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Coherent photoproduction of the neutral pion and eta meson on the deuteron, γd→π 0 ηd, has been experimentally studied at incident photon energies ranging from the reaction threshold to 1.15 GeV. The total cross section demonstrates a rapid rise below 1 GeV. The data are underestimated by the existing theoretical calculations based on quasi-free π 0 η photoproduction on the nucleon followed by deuteron coalescence. At the same time, the data are rather well reproduced by the calculations taking into account the final-state interaction. We have also measured for the first time the differential cross sections: the π 0 η invariant-mass distribution dσ/dMπη, the π 0 d invariant-mass distribution dσ/dM πd , the ηd invariant-mass distribution dσ/dM ηd , and the distribution over the deuteron emission angle dσ/dΩ d in the overall center-of-mass frame. The measured cross section dσ/dΩ d does not exhibit strongly backward-peaking behavior predicted by the calculations. At all incident energies, an increase in dσ/dM ηd near the ηd threshold is observed, which indicates a bound or virtual ηd state resulting from a strong attraction between η and a deuteron. The possibilities of using coherent π 0 η photoproduction on a nucleus to study the η-nuclear interaction are also discussed.

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“…The conclusions above applies also to the calculations presented in Ref. [72] (black curves in Fig. 4).…”

Section: B Total Cross Sectionsupporting

confidence: 79%

Section: Differential Cross Sectionsmentioning

confidence: 96%

Coherent photoproduction of the neutral pion and eta meson on the deuteron at incident energies below 1.15 GeV

Ishikawa,

Fix,

Fujimura

et al. 2022

Preprint

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“…[54] and in Ref. [55], respectively. The squares (cyan) show σ obtained for the events with M ηd < 2.47 GeV, and the dotted curve (green) shows the corresponding phase space contribution.…”

mentioning

confidence: 96%

“…The solid (red) and dashed (black) curves show theoretical calculations with ηd and other FSIs in Ref [54]. and in Ref [55],. respectively.…”

mentioning

confidence: 99%

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Resonance-like structure near the $ηd$ threshold in the $γ{d}${$\to$}$π^0η{d}$ reaction

Ishikawa,

Fujimura,

Fukasawa

et al. 2021

Preprint

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To investigate the interaction between the nucleon N and nucleon resonance N (1535)1/2 − , the ηd threshold structure, connected to the isoscalar S-wave N -N (1535)1/2 − system, has been experimentally studied in the γd→π 0 ηd reaction at incident photon energies ranging from the reaction threshold to 1.15 GeV. A strong enhancement is observed near the ηd threshold over the three-body phase-space contribution in the ηd invariant-mass distribution. An analysis incorporating the known isovector resonance D12 with a spin-parity of 2 + in the π 0 d channel has revealed the existence of a narrow isoscalar resonance-like structure D ηd with 1 − in the ηd system. The Breit-Wigner mass of D ηd is found to be 2.425 −0.006 +0.003 GeV, located just close to the ηd threshold, and the width is 0.034 +0.004 −0.003 GeV. The D ηd would be a predicted isoscalar 1 − ηN N bound state from the ηN N and πN N coupled-channel calculation, or ηd virtual state owing to strong ηd attraction.

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Coherent Neutral Pion and eta Meson Photoproduction on the Deuteron

Ishikawa¹

2021

Few-Body Syst

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Coherent photoproduction of two neutral pseudoscalar mesons on light nuclei

Cited by 11 publications

References 42 publications

Coherent photoproduction of the neutral pion and eta meson on the deuteron at incident energies below 1.15 GeV

Coherent photoproduction of the neutral pion and eta meson on the deuteron at incident energies below 1.15 GeV

Resonance-like structure near the $ηd$ threshold in the $γ{d}${$\to$}$π^0η{d}$ reaction

Coherent Neutral Pion and eta Meson Photoproduction on the Deuteron

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