QCD symmetries and the η and η ′ in nuclei

Bass, Steven D.

doi:10.1007/s10751-015-1139-7

Cited by 3 publications

(4 citation statements)

References 63 publications

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“…MeV, which is equal to the h¢ meson mass shift in the medium, and W 10 2.5 0 ( ) ( ) r = - MeV at the saturation density 0 r and for average h¢ momenta of » 1 GeV/c. The h¢ in-medium mass shift, determined by the CBELSA/TAPS Collaboration, is very similar to that of −37 MeV, calculated within the quark meson coupling model [7][8][9], and disfavors the larger h¢ mass shifts, downwards by up to 80-200 MeV, as predicted in [2,3,5,[12][13][14][15]. The small imaginary part of the h¢-nucleus optical potential compared to its real part provides the possibility for the observation of relatively narrow bound h¢-nucleus states [2-4, 6-8, 10-12].…”

Section: Introductionsupporting

confidence: 71%

Study of in-medium ${\eta }^{\prime} $ properties in the (γ, $\eta ^{\prime} p$) reaction on nuclei

Paryev¹

2015

J. Phys. G: Nucl. Part. Phys.

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We study the near-threshold photoproduction of η ′ mesons from nuclei in coincidence with forward going protons in the kinematical conditions of the Crystal Barrel/TAPS experiment, recently performed at ELSA. The calculations have been performed within a collision model based on the nuclear spectral function. The model accounts for both the primary γp → η ′ p process and the two-step intermediate nucleon rescattering processes as well as the effect of the nuclear η ′ mean-field potential. We calculate the exclusive η ′ kinetic energy distributions for the 12 C(γ, η ′ p) reaction for different scenarios of η ′ in-medium modification. We find that the considered two-step rescattering mechanism plays an insignificant role in η ′ p photoproduction off the carbon target. We also demonstrate that the calculated η ′ kinetic energy distributions in primary photon-proton η ′ p production reveal strong sensitivity to the depth of the real η ′ potential at normal nuclear matter density (or to the η ′ in-medium mass shift) in the studied incident photon energy regime. Therefore, such observables may be useful to help determine the above η ′ in-medium renormalization from the comparison of the results of our calculations with the data from the CBELSA/TAPS experiment. In addition, we show that these distributions are also strongly influenced by the momentum-dependent optical potential, which the outgoing participant proton feels inside the carbon nucleus. This potential should be taken into account in the analysis of these data with the aim to obtain information on the η ′ modification in cold nuclear matter.

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Section: Introductionsupporting

confidence: 71%

Study of in-medium ${\eta }^{\prime} $ properties in the (γ, $\eta ^{\prime} p$) reaction on nuclei

Paryev¹

2015

J. Phys. G: Nucl. Part. Phys.

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“…However we do not expect the relative momentum distribution of the N * in the nucleus to depend strongly on the mass of the N * (an expectation which will be verified later numerically). We thus proceed further without a non-zero ω which would give rise to poles in (5) and make the calculation of the N * nucleus potential a formidable task. The potential in ( 5) is Fourier transformed to obtain the potential in r-space.…”

Section: A Elementary N N * Interactionmentioning

confidence: 99%

“…However, apart from two controversial experiments [4], there has been no definite evidence for the existence of these states. Meanwhile, the interest has also shifted from η to η ′ mesic nuclei [5]. However, the WASA group [6] is still active in the search for eta-mesic states in light nuclei (see also [7] for theoretical works on eta-mesic helium nuclei).…”

Section: Introductionmentioning

confidence: 99%

Momentum distribution of N* in nuclei

Kelkar

2016

Eur. Phys. J. A

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Due to its dominance in the low energy eta-nucleon interaction, the S11 N * (1535) resonance enters as an important ingredient in the analyses of experiments aimed at finding evidence for the existence of eta-mesic nuclei. The static properties of the resonance get modified inside the nucleus and its momentum distribution is used in deciding these properties as well as the kinematics in the analyses. Here we show that given the possibility for the existence of an N * -3 He quasibound state, the relative momentum distribution of an N * and 3 He inside such a 4 He is narrower than that of neutron-3 He in 4 He. Results for the N * -24 Mg system are also presented. The present exploratory work could be useful in motivating searches of exotic N * -nucleus quasibound states as well as in performing analyses of eta meson production data.

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“…One finds an η ′ effective mass shift in nuclei of about -37 MeV at nuclear matter density, in excellent agreement with the prediction of the Quark Meson Coupling model [13], QMC, through coupling of the light quarks in the meson to the σ mean field inside the nucleus. The η ′ experiences an effective mass shift in nuclei which is catalysed by its gluonic component [1,14]. Although the η ′ -nucleon interaction in free space is much weaker [10] than the η-nucleon interaction [15], the small width of the η ′ in medium [16] means that the η ′ may be a good candidate for possible bound state searches, e.g.…”

Section: Introductionmentioning

confidence: 99%

Etaprime interactions with nucleons and nuclei

Bass,

Moskal

2015

Preprint

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QCD symmetries and the η and η ′ in nuclei

Abstract: We discuss the role of QCD symmetries in understanding the η and η mesons in nuclear media. Recent results on the η mass in nuclei from the CBELSA/TAPS collaboration are very similar to the prediction of the Quark Meson Coupling model.

Cited by 3 publications

References 63 publications

Study of in-medium ${\eta }^{\prime} $ properties in the (γ, $\eta ^{\prime} p$) reaction on nuclei

Study of in-medium ${\eta }^{\prime} $ properties in the (γ, $\eta ^{\prime} p$) reaction on nuclei

Momentum distribution of N* in nuclei

Etaprime interactions with nucleons and nuclei

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