The formation probabilities oF Σ-hypernuclei and the “unstable bound state”

Morimatsu, Osamu; Yazaki, K.

doi:10.1016/0375-9474(85)90185-x

Cited by 104 publications

(97 citation statements)

References 11 publications

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“…To evaluate the formation cross section, we use the Green's function method [28,29]. In this method, the reaction cross section is assumed to be separated into the nuclear response function R(E) and the elementary cross section of the pn → dη ′ process with the impulse approximation:…”

Section: Introductionmentioning

confidence: 99%

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Formation ofη′(958)-mesic nuclei by the (p,d) reaction

et al. 2013

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We calculate theoretically the formation spectra of η ′ (958)-nucleus systems in the (p, d) reaction for the investigation of the in-medium modification of the η ′ mass. We show the comprehensive numerical calculations based on a simple form of the η ′ optical potential in nuclei with various potential depths. We conclude that one finds an evidence of possible attractive interaction between η ′ and nucleus as peak structure appearing around the η ′ threshold in light nuclei such as 11 C when the attractive potential is stronger than 100 MeV and the absorption width is of order of 40 MeV or less. Spectroscopy of the (p, d) reaction is expected to be performed experimentally at existing facilities, such as GSI. We also estimate the contributions from the ω and φ mesons, which have masses close to the η ′ meson, concluding that the observation of the peak structure of the η ′ -mesic nuclei is not disturbed although their contributions may not be small.

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Section: Introductionmentioning

confidence: 99%

“…In the Green's function method [28], one can separately calculate each contribution to the spectrum coming from the different η ′ processes. On the prescription of Ref.…”

Section: Introductionmentioning

confidence: 99%

Formation ofη′(958)-mesic nuclei by the (p,d) reaction

et al. 2013

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“…We choose the incident photon energy as E γ = 3 GeV, which is the beam energy accessible at SPring-8, and choose 12 C as a target nucleus. We use the Green function method to calculate the formation cross sections [25] as,…”

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confidence: 99%

Formation ofη′(958)-Mesic Nuclei and AxialUA(1)Anomaly at Fin

2005

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We discuss the possibility to produce the bound states of the η ′ (958) meson in nuclei theoretically. We calculate the formation cross sections of the η ′ bound states with the Green function method for (γ,p) reaction and discuss the experimental feasibility at photon facilities like SPring-8. We conclude that we can expect to observe resonance peaks in (γ,p) spectra for the formation of η ′ bound states and we can deduce new information on η ′ properties at finite density. These observations are believed to be essential to know the possible mass shift of η ′ and deduce new information of the effective restoration of the chiral UA(1) anomaly in the nuclear medium.

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“…We use the Green function method [60] to calculate the cross sections for ω-mesic states formation as described in Refs. [61] in detail.…”

Section: In-medium ω-Meson Mass and Cbelsa/taps Experimentsmentioning

confidence: 99%

Photo- and electro-production of mesons on nucleons and nuclei

Oset

Döring

Strottman

et al. 2008

Progress in Particle and Nuclear Physics

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In these lectures I will show some results obtained with the chiral unitary approach applied to the photo and electroproduction of mesons. The results for photoproduction of ηπ 0 p and K 0 π 0 Σ + , together with related reactions will be shown, having with common denominator the excitation of the ∆(1700) resonance which is one of those dynamically generated in the chiral unitary approach. Then I will show results obtained for the e + e − → φf 0 (980) reaction which reproduce the bulk of the data except for a pronounced peak, giving support to a new mesonic resonance, X(2175). Results will also be shown for the electromagnetic form factors of the N * (1535) resonance, also dynamically generated in this approach. Finally, I will show some results on the photoproduction of the ω in nuclei, showing that present experimental results claiming a shift of the ω mass in the medium are tied to a particular choice of background and are not conclusive. On the other hand, the same experimental results show unambiguously a huge increase of the ω width in the nuclear medium.

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The formation probabilities oF Σ-hypernuclei and the “unstable bound state”

Cited by 104 publications

References 11 publications

Formation ofη′(958)-mesic nuclei by the (p,d) reaction

Formation ofη′(958)-mesic nuclei by the (p,d) reaction

Formation ofη′(958)-Mesic Nuclei and AxialUA(1)Anomaly at Fin

Photo- and electro-production of mesons on nucleons and nuclei

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