Isoscalar short-range current in the deuteron induced by an intermediate dibaryon

Kukulin, V. I.; Obukhovsky, I. T.; Grabmayr, P.; Faessler, Amand

doi:10.1103/physrevc.74.064005

Cited by 23 publications

(5 citation statements)

References 96 publications

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“…The predictions of the model for the empirical N N -scattering phase shifts as well as for the lightest nuclei properties are at the same level of accuracy as those of other modern N N -force models, like Bonn and Argonne, still keeping quite moderate values for short-range cutoff parameters (Λ πN N , etc. ), which are compatible with the QCD and quark model estimations (for the details, see [14,15] and references therein to the earlier works).…”

supporting

confidence: 86%

“…We emphasize that within the dibaryon model [14,15], the best description of the N N -scattering phase shifts and the properties of the lightest nuclei has been achieved with a rather low mass of the σ meson, m σ ≃ 350 MeV, whereas in the conventional meson-exchange N N -force models the σ mass is taken to be 500-600 MeV. Since in the dibaryon model the initial 6q bag (with the quark configuration |s 4 p 2 [42] ) is a dense object (r 6q ≃ 0.5-0.6 fm) and is also the 2 ω-excited hadronic state, the renormalisation of the σ mass in the field of the bag might be related to the partial CSR [14].…”

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confidence: 99%

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ABC effect as a signal of chiral symmetry restoration in hadronic collisions

2013

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A new nonconventional mechanism for the basic 2π-fusion reaction pn → d + (ππ)0 in the energy region Tp = 1.0-1.4 GeV is suggested. The mechanism is aimed at providing a consistent explanation for the comprehensive experimental studies of this reaction in exclusive setting done recently by the WASA-at-COSY Collaboration. The basic assumption of the model proposed is the production of the I(J P ) = 0(3 + ) dibaryon resonance D03 in the pn collision. The interference of two decay channels of this resonance: D03 → d + σ → d + (ππ)0 and D03 → D12 + π → d + (ππ)0 is shown to give a strong near-threshold enhancement in the ππ invariant mass spectrum, which is well known as the ABC effect. The σ-meson parameters found to reproduce the ABC enhancement are in a general agreement with models which predict the chiral symmetry restoration at high excitation energy and/or high density of matter, although they are essentially less than those accepted for the free σ meson. So, this result might be considered as an indication of partial chiral symmetry restoration in dense and excited quark matter.The famous Abashian-Booth-Crowe (ABC) effect discovered more than 50 years ago [1] is observed in doublepionic fusion reactions [1-3] as a pronounced spectral enhancement of isoscalar nature just above the ππ-production threshold. The effect was initially interpreted [1] as being due to strong ππ rescattering in the scalar-isoscalar channel, associated naturally with the σ meson. However later on the interpretation was left since no narrow resonance with an appropriate mass (m ≃ 300 MeV) was found in ππ scattering at low energies. At the same time, an other interpretation [4] for the ABC effect, based on a generation of two ∆ isobars via the t-channel meson exchange and their subsequent decays with pion emission, was commonly accepted. Although the "t-channel ∆∆" mechanism did not provide quantitative description of the data, it allowed to reproduce the shape of differential cross sections found in the numerous inclusive experiments on double-pionic fusion [4,5].The situation has changed dramatically quite recently, after publication of the results of the first exclusive and kinematically complete experiments for the basic 2π-fusion reaction pn → d + π 0 π 0 done by the CEL-SIUS/WASA [6] and then by the WASA-at-COSY Collaborations [7]. The comparison of the new experimental data with theoretical predictions has demonstrated clearly that the above t-channel ∆∆ model cannot reproduce even the qualitative behaviour of the experimental energy and angular distributions, giving just a low background in the considered energy region (T p = 1.0-1.4 GeV). At the same time, the most intriguing discovery of these exclusive experiments was an observation of a pronounced resonance structure in the total 2π-production cross section. This fact has been interpreted as a generation of the dibaryon resonance D 03 * Electronic address: platonova@nucl-th.sinp.msu.ru † Electronic address: kukulin@nucl-th.sinp.msu.ru in the pn collision, with quantum number...

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supporting

confidence: 86%

mentioning

confidence: 99%

ABC effect as a signal of chiral symmetry restoration in hadronic collisions

2013

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“…To enhance the data consistency between the experiment and the theory it might be valuable to account for two-particle mechanisms in the photoproduction amplitude (for example, account for interaction of nucleon resonance and spectator nucleon), account for the effect of inelasticity in N N -rescattering, account for relativistic effects at high energies, account for the contribution of ∆isobar component of the deuteron wave function within the quark model, 32 as well as the possibility to provide the deuteron description based on new mechanisms of the nucleon-nucleon interaction at short distances. 33,34 1950010-7…”

Section: Resultsmentioning

confidence: 99%

Measurement of the tensor analyzing power for the reaction γd → pnπ0

Lukonin

Gauzshtein

Karpenko

et al. 2019

Int. J. Mod. Phys. E

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The paper discusses the results of measurement for three components of tensor analyzing power for the reaction of incoherent [Formula: see text]-meson photoproduction on a deuteron within the proton energy range of 15–200[Formula: see text]MeV and the neutron energy range of 15–150[Formula: see text]MeV. The experiment was performed on the deuterium internal gas target of VEPP-3 electron accelerator using the protons and neutrons coincidence counting technique. The results of measurements of the tensor analyzing power’s components are compared with the results of statistical modeling performed within the frameworks of a theoretical model.

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“…To improve the agreement, other possible reaction mechanisms must be considered. The latter may include, for example, the interaction between nucleon resonance and spectator nucleon in the intermediate state, as well as the ∆∆ component of the deuteron wave function [19] and additional contributions to the NN interaction, which may be important at small internucleon distances [20][21][22][23].…”

Section: Discussionmentioning

confidence: 99%

Measurement of the Tensor-Analyzing Power Component T20 for Incoherent Negative Pion Photoproduction on a Deuteron

Kuzmenko

Gauzshtein

Darwish

et al. 2023

Atoms

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New results for the T20-component of the tensor-analyzing power of the incoherent negative pion photoproduction are presented. The experiment was performed for the electron beam energy of 800 MeV at the VEPP-3 storage ring in 2021. To extract the T20-component, we used asymmetry with respect to the change in the sign of the tensor polarization of the deuteron target. Identification of the reaction events was carried out by the detection of two protons in coincidence. Experimental data were compared with the results of statistical simulation, considering the interaction between the NN and πN subsystems in the final state of the reaction.

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Isoscalar short-range current in the deuteron induced by an intermediate dibaryon

Cited by 23 publications

References 96 publications

ABC effect as a signal of chiral symmetry restoration in hadronic collisions

ABC effect as a signal of chiral symmetry restoration in hadronic collisions

Measurement of the tensor analyzing power for the reaction γd → pnπ0

Measurement of the Tensor-Analyzing Power Component T20 for Incoherent Negative Pion Photoproduction on a Deuteron

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