Inclusive ω photoproduction from nuclei and ω in the nuclear medium

Kaskulov, M.; Hernández, E.; Oset, E.

doi:10.1140/epja/i2006-10169-6

Cited by 86 publications

(146 citation statements)

References 40 publications

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“…A comparison to theoretical calculations [20][21][22][23] yields within model uncertainties in-medium widths of (140±20) MeV and (20±5) MeV for the ω and η meson, respectively, for recoil momenta of about 1.1 GeV/c. The corresponding imaginary part of the ω-and η -nucleus potential then is W ω =70±10 MeV and W η =10±2.5 MeV, respectively.…”

Section: The Imaginary Part Of the Meson-nucleus Potentialmentioning

confidence: 68%

Experimental results on theω- andη′-nucleus potential - on the way to mesic states

Nanova¹

2015

EPJ Web of Conferences

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Abstract. Different experimental approaches to determine the meson-nucleus optical potential are discussed. The experiments have been performed with the Crystal Barrel/TAPS detector system at the ELSA accelerator in Bonn and the Crystal Ball/TAPS at the MAMI accelerator in Mainz. Experimental results about the real and imaginary part of the η -and ω-nucleus optical potential are presented. The imaginary part of the meson-nucleus optical potential is determined from the in-medium width of the meson by the measurement of the transparency ratio. Information on the real part of the optical potential is deduced from measurements of the excitation function and momentum distribution which are sensitive to the sign and depth of the potential. The results are discussed and compared to theoretical predictions. The data for both mesons are consistent with a weakly attractive potential. The formation and population of ω-nucleus and η -nucleus bound states is additionally discussed.

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Section: The Imaginary Part Of the Meson-nucleus Potentialmentioning

confidence: 68%

Experimental results on theω- andη′-nucleus potential - on the way to mesic states

Nanova¹

2015

EPJ Web of Conferences

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“…The deviations of the cross sections from the scaling with the mass number A can be related to the in-medium width of the produced meson (the basic idea is simple; the smaller the scaling coefficient the larger the absorption probability, the larger the reduction of lifetime of the meson and the larger its effective in-medium width). The formalism, which does not require a particular model for the elementary production process, is given in [165,166,167]; details such as corrections for photon shadowing effects [155] and two-body absorption processes are discussed in [153]. Results for T A for η production off nuclei are summarized in Fig.…”

Section: Inclusive Productionmentioning

confidence: 99%

Production of η and η′ mesons on nucleons and nuclei

Krusche¹,

Wilkin²

2015

Progress in Particle and Nuclear Physics

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The production of η and η mesons in photon-and hadron-induced reactions on free and quasifree nucleons and on nuclei is reviewed. The extensive database on γN → ηN , for both proton and neutron targets, is described in detail and its implications for the search for N resonances much heavier than the dominant S 11 (1535) discussed. Though less is currently known about the production of the η or of ηπ pairs, these also offer tantalizing prospects in the search for the missing isobars. The more limited data available on pion-induced production are still necessary ingredients in the partial wave analysis discussed.The production of the η-meson in pp and pn collisions shows once again the strong influence of the S 11 (1535) isobar, which is in contrast to the relatively weak behaviour seen near threshold for η production. This difference is reflected in the important final state interaction effects of the η in nuclei that may even lead to this meson being "bound" in some systems. The evidence for this is reviewed for both γA and pA collisions. The inclusive photoproduction of η, η , and ηπ pairs from nuclei provides further information regarding the production mechanism and the interaction of the η and η with nuclei and the ηπ pairs may even allow access to low mass ηA systems that are forbidden in direct single-meson photoproduction.

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“…The intrinsic probabilities for these reactions as a function of the nuclear matter density are calculated using the phenomenological model of Refs [57], which also includes higher order quasielastic cuts and the twobody and three-body absorption mechanisms. Details for the present case are described in [56]. …”

Section: The Monte Carlo Simulation Proceduresmentioning

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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Inclusive ω photoproduction from nuclei and ω in the nuclear medium

Cited by 86 publications

References 40 publications

Experimental results on theω- andη′-nucleus potential - on the way to mesic states

Experimental results on theω- andη′-nucleus potential - on the way to mesic states

Production of η and η′ mesons on nucleons and nuclei

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

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