Λ⁎(1405)-matter: Stable or unstable?

Hrtánková, J.; Barnea, Nir; Friedman, E.; Gal, A.; Mareš, J.; Schäfer, M.

doi:10.1016/j.physletb.2018.08.031

Cited by 13 publications

(16 citation statements)

References 27 publications

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“…Nemura's mass-formula curve fitted to the accurate SVM results at m = 4 ∼ 8 predicts that the (Λ * ) m multiplet becomes absolutely stable at around m = 12, even when the adjusted Machleidt potential is employed. Thus, the SVM calculation with full higher-order correlations clearly denies Hrtánková et al 28) against stable Λ * matter is clearly denied by Nemura's SVM calculation. 31) The present theoretical analysis suggests the possible existence of stable Λ * = (K − p) = ((ūs)(uud)) matter in the quark-antiquark hybrid sector.…”

Section: §1 Introductionmentioning

confidence: 80%

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Kaonic Nuclear Clusters --- a New Paradigm of Particle and Nuclear Physics ---

Akaishi¹,

Yamazaki²

2019

Preprint

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Λ * =Λ(1405) plays an essential role in forming kaonic nuclear clusters (KNC). The simplest KNC, K − pp, has the structure Λ * p=(K − p) I=0 p, where a real kaon migrates between two nucleons, mediating super-strong Λ * p attraction. Production data of K − pp have been accumulated by DISTO, J-PARC E27 and J-PARC E15 experiments. In the case of K − K − pp, the attractive covalent bond of Λ * Λ * is doubly enhanced compared to the Λ * p one. As a consequence, a m-th Λ * multiplet, (Λ * )m, with m(m − 1)/2 bonds becomes more stable than its corresponding neutron aggregate, (n)m, with m = 8 ∼ 12. This may suggest the possible existence of stable Λ * matter. The production of K − K − pp by high-energy pp or heavy-ion collisions is awaited as a doorway to so-far unknown Λ * matter.

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Section: §1 Introductionmentioning

confidence: 80%

“…As for Λ * matter, Hrtánková et al 28) calculated the BE m /m of (Λ * ) m system from m = 8 to 168 by a σ-ω Relativistic Mean Field (RMF) approach. 29) The curve, referred to as "RMF cal."…”

Section: §1 Introductionmentioning

confidence: 99%

Kaonic Nuclear Clusters --- a New Paradigm of Particle and Nuclear Physics ---

Akaishi¹,

Yamazaki²

2019

Preprint

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“…Besides the problem of the stability of SQM conglomerates with respect to the strong, weak and electromagnetic interactions, is currently debated in literature [9], it is worth investigating the gravitational stability of SQM halos in Milky Way-size spiral galaxies. We then explore the gravitational stability of halos composed of SQM conglomerates, considering the lower mass limit m * > 7.46 GeV for the DM candidate.…”

Section: Pos(multif2019)011mentioning

confidence: 99%

Massive hadronic candidates to dark matter

Merafina¹

2020

Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019)

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A new family of equilibrium configurations for galactic halos is introduced, taking into account the possibility to identify strange particles conglomerates with masses larger than 8 GeV as components of the dark matter. This possibility may have important consequences on the formation of massive particles during the Big Bang in the framework of the Standard Model. The obtained results are in agreement with the values in mass and radius requested to be consistent with the rotational velocity curve observed in our Galaxy. In addition, the average density of such strange dark matter halos is similar to one for halos of dwarf spheroidal galaxies, suggesting a common origin of the two families of cosmic structures.

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“…What these authors apparently missed was that solving the A-body Schrödinger equation for purely attractive Λ * Λ * interactions will necessarily lead to collapse, with the binding energy per Λ * , B/A, and the central Λ * density ρ(r ≈ 0) diverging as A increases. The collapse of Λ * nuclei may be averted within relativistic mean field (RMF) calculations [68], as briefly described below and further detailed by Hrtánková in a separate contribution. [68], within RMF calculations in which strongly attractive Λ * Λ * interactions are generated through scalar meson (σ) and vector meson (ω) exchanges, is that both B/A and the central density ρ(r ≈ 0) saturate for values of A of order A ∼ 100: B/A saturates at values between roughly 30 to 80 MeV, depending on details of the RMF modeling, and the associated central densities saturate at values about twice nuclear-matter density.…”

Section: Charge Symmetry Breakingmentioning

confidence: 99%

Old & new in strangeness nuclear physics

Gal¹

2019

AIP Conference Proceedings

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Several persistent problems in strangeness nuclear physics are discussed in this opening talk at HYP2018, Norfolk VA, June 2018: (i) the 3 Λ H, and 3 Λ n if existing, lifetimes; (ii) charge symmetry breaking in Λ hypernuclei; (iii) the overbinding of 5 Λ He which might be related to the hyperon puzzle in neutron stars; and (iv) does Λ * (1405) survive in strange hadronic matter? Progress in Strangeness Nuclear Physics which 50 years ago consisted mostly of Hypernuclear Physics, with data collected exclusively in nuclear emulsions and bubble chambers, has been stepped up significantly with the advent of counter production experiments [1]. The left panel of Fig. 1 shows a 89 Y(π + , K + ) spectrum from KEK [2], exhibiting distinct Λ single-particle orbits in 89 Λ Y down to the ground-state (g.s.) s Λ orbit, a feature unparalleled in ordinary nuclei and hence termed "a textbook example of a shell model at work" [3].The right panel of Fig. 1 presents a compilation of most of the Λ hypernuclear binding energies (B Λ ) measured across the periodic table as a function of A −2/3 and as fitted by a simple 3-parameter Woods-Saxon (WS) potential. The Λ nuclear potential well depth D Λ in this simple-minded fit is 30 MeV, compared to 27.8±0.3 MeV from the 1988 first theoretical analysis [3] of the AGS (π + , K + ) data [4]. Although the robustness of extrapolating to A → ∞ is primarily owing to the (π + , K + ) production data in medium-weight and heavy nuclei, it is worth noting that D Λ was derived more than 50 years ago, to less accuracy of course, from π − decays of heavy spallation hypernuclei formed in silver and bromine emulsions [5,6]: 27±3 MeV (1964) and 27.2±1.3 MeV (1965), respectively.

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Λ⁎(1405)-matter: Stable or unstable?

Cited by 13 publications

References 27 publications

Kaonic Nuclear Clusters --- a New Paradigm of Particle and Nuclear Physics ---

Kaonic Nuclear Clusters --- a New Paradigm of Particle and Nuclear Physics ---

Massive hadronic candidates to dark matter

Old & new in strangeness nuclear physics

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