Determination of the<i>ω</i>- and<i>η</i>′-nucleus optical potential

Nanova, M.; Metag, V.

doi:10.1051/epjconf/201613002007

Cited by 6 publications

(15 citation statements)

References 29 publications

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“…A ω Figure 46: Depths of the real part of the ω-nucleus potential determined by analyzing the excitation function and the momentum distributions for C [235]. The weighted overall average is indicated by a blue square and the shaded area.…”

Section: [Mev]mentioning

confidence: 99%

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Meson–nucleus potentials and the search for meson–nucleus bound states

Metag

Nanova

Paryev

2017

Progress in Particle and Nuclear Physics

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108

102

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Recent experiments studying the meson-nucleus interaction to extract meson-nucleus potentials are reviewed. The real part of the potentials quantifies whether the interaction is attractive or repulsive while the imaginary part describes the meson absorption in nuclei. The review is focused on mesons which are sufficiently long-lived to potentially form meson-nucleus quasi-bound states. The presentation is confined to meson production off nuclei in photon-, pion-, proton-, and lightion induced reactions and heavy-ion collisions at energies near the production threshold. Tools to extract the potential parameters are presented. In most cases, the real part of the potential is determined by comparing measured meson momentum distributions or excitation functions with collision model or transport model calculations. The imaginary part is extracted from transparency ratio measurements. Results on K + , K 0 , K − , η, η , ω, and φ mesons are presented and compared with theoretical predictions. The interaction of K + and K 0 mesons with nuclei is found to be weakly repulsive, while the K − , η, η , ω and φ meson-nucleus potentials are attractive, however, with widely different strengths. Because of meson absorption in the nuclear medium the imaginary parts of the meson-nucleus potentials are all negative, again with a large spread. An outlook on planned experiments in the charm sector is given. In view of the determined potential parameters, the criteria and chances for experimentally observing meson-nucleus quasi-bound states are discussed. The most promising candidates appear to be the η and η mesons.

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Section: [Mev]mentioning

confidence: 99%

“…The vertical hatched lines mark the range of systematic uncertainties. The figure is taken from [235].…”

Section: [Mev]mentioning

confidence: 99%

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Meson–nucleus potentials and the search for meson–nucleus bound states

Metag

Nanova

Paryev

2017

Progress in Particle and Nuclear Physics

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108

102

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“…The vertical hatched lines mark the range of systematic uncertainties. The figures are taken from [31].…”

Section: Pos(bormio2017)035mentioning

confidence: 99%

Mesons in the medium - experimental probes for chiral symmetry restoration?

Nanova¹,

Cbelsa²

2017

Proceedings of 55th International Winter Meeting on Nuclear Physics — PoS(BORMIO2017)

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The in-medium modifications of hadron properties have been identified as one of the key problems in understanding the non-perturbative sector of QCD. Several theoretical papers discuss the possibility of a partial restoration of chiral symmetry in a strongly interacting environment. However, is it possible to find experimental evidence for partial symmetry restoration by studying the in-medium behaviour of mesons, and the meson-nucleus interaction. Is this interaction sufficiently strong to allow even the formation of mesic states only bound by the strong interaction? The answers can be given by studying the meson-nucleus complex potential. The experimental approaches to deduce this potential and the experimental results from CBELSA/TAPS are presented and discussed. Data taken on a C and Nb target at the Crystal Barrel (CB)/TAPS detector system at the ELSA accelerator facility in Bonn have been analyzed to deduce the η -and ω-nucleus potential. 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 discussed. In case of the ω meson the in-medium width is found to be larger than the potential depth which hampers a successful experimental identification of ω-mesic states. The relatively small in-medium width of the η meson encourages ongoing experiments to search for η -nucleus bound states.

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“…In fact, a recent experimental observation by the CBELSA/TAPS collaboration of η decaying into six photons inside a nuclear target finds that the effective optical potential is given as V 0 (ρ = ρ 0 ) = −(37 ± (sta) ± (syst)) MeV (Nanova et al, 2013). Moreover, the two pion Bose-Einstein correlation observed at RHIC seems to suggest the quenching of the η mass at high temperature (Csorgo et al, 2010;Vertesi et al, 2011Vertesi et al, , 2009).…”

Section: Introductionmentioning

confidence: 99%