Coherent<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:mi>η</mml:mi></mml:mrow></mml:math>photoproduction on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>s</mml:mi></mml:math>-shell nuclei

Egorov, M. V.; Fix, A.

doi:10.1103/physrevc.88.054611

Cited by 18 publications

(34 citation statements)

References 63 publications

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“…The curves represent the model results from [23]. (f) shows the data for the γd → dπ 0 η reaction [28] with model results from [46]. Only the statistical uncertainties are shown.…”

Section: Resultsmentioning

confidence: 99%

Photoproduction of $\eta$ $\pi$ pairs off nucleons and deuterons

Käser¹,

Müller²,

Ahrens³

et al. 2016

Eur. Phys. J. A

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Quasi-free photoproduction of πη-pairs has been investigated from threshold up to incident photon energies of 1.4 GeV, respectively up to photon-nucleon invariant masses up to 1.9 GeV. Total cross sections, angular distributions, invariant-mass distributions of the πη and meson-nucleon pairs, and beam-helicity asymmetries have been measured for the reactions γp → pπ 0 η, γn → nπ 0 η, γp → nπ + η, and γn → pπ − η from nucleons bound inside the deuteron. For the γp initial state data for free protons have also been analyzed. Finally, the total cross sections for quasi-free production of π 0 η pairs from nucleons bound in 3 He nuclei have been investigated in view of final state interaction (FSI) effects. The experiments were performed at the tagged photon beam facility of the Mainz MAMI accelerator using an almost 4π covering electromagnetic calorimeter composed of the Crystal Ball and TAPS detectors. The shapes of all differential cross section data and the asymmetries are very similar for protons and neutrons and agree with the conjecture that the reactions are dominated by the sequential ∆ ⋆ 3/2 − → η∆(1232) → πηN decay chain, mainly with ∆(1700)3/2 − and ∆(1940)3/2 − . The ratios of the magnitude of the total cross sections also agree with this assumption. However, the absolute magnitudes of the cross sections are reduced by FSI effects with respect to free proton data.

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“…The curves represent the model results from [23]. (f) shows the data for the γd → dπ 0 η reaction [28] with model results from [46]. Only the statistical uncertainties are shown.…”

Section: Resultsmentioning

confidence: 99%

Photoproduction of $\eta$ $\pi$ pairs off nucleons and deuterons

Käser¹,

Müller²,

Ahrens³

et al. 2016

Eur. Phys. J. A

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“…The lower index "0" in K 0 and L 0 relates to the isoscalar part of these amplitudes in (5). According to the analysis outlined above the isoscalar part t 0 in Eq.…”

Section: Resultsmentioning

confidence: 99%

“…The formalism, which we used to calculate the cross section (1), was partially considered in our previous work [5] on coherent photoproduction of π 0 η pairs. The cross section for coherent photoproduction of two mesons on a nucleus A with spin J is given in the center-of-mass frame by…”

Section: Formalismmentioning

confidence: 99%

Coherentπ0π0photoproduction on lightest nuclei

Egorov

Fix

2015

Nuclear Physics A

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“…Total cross sections have been extracted for all four reaction channels and are compared to the results from the reaction model discussed in [14]. In addition, the total cross section for the coherent reaction γd → dπ 0 η has been determined and compared to the model results from Egorov and Fix [22].…”

Section: Introductionmentioning

confidence: 99%

The isospin structure of photoproduction of πη pairs from the nucleon in the threshold region

et al. 2015

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Photoproduction of πη-pairs from nucleons has been investigated from threshold up to incident photon energies of ≈ 1.4 GeV. The quasi-free reactions γp → pπ 0 η, γn → nπ 0 η, γp → nπ + η, and γn → pπ − η were for the first time measured from nucleons bound in the deuteron. The corresponding reactions from a free-proton target were also studied to investigate final-state interaction effects (for neutral pions the free-proton results could be compared to previous measurements; the γp → nπ + η reaction was measured for the first time). For the π 0 η final state coherent production via the γd → dπ 0 η reaction was also investigated. The experiments were performed at the tagged photon beam of the Mainz MAMI accelerator using an almost 4π coverage electromagnetic calorimeter composed of the Crystal Ball and TAPS detectors. The total cross sections for the four different final states obey the relation σ(pπ 0 η) ≈ σ(nπ 0 η) ≈ 2σ(pπ − η) ≈ 2σ(nπ + η) as expected for a dominant contribution from a ∆ ⋆ → η∆(1232) → πηN reaction chain, which is also supported by the shapes of the invariant-mass distributions of nucleon-meson and π-η pairs. The experimental results are compared to the predictions from an isobar reaction model.

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Coherentπ0ηphotoproduction ons-shell nuclei

Cited by 18 publications

References 63 publications

Photoproduction of $\eta$ $\pi$ pairs off nucleons and deuterons

Photoproduction of $\eta$ $\pi$ pairs off nucleons and deuterons

Coherentπ0π0photoproduction on lightest nuclei

The isospin structure of photoproduction of πη pairs from the nucleon in the threshold region

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