First measurement of the K−n →Λπ− non-resonant transition amplitude below threshold

Piscicchia, K.; Wycech, S.; Fabbietti, L.; Cargnelli, M.; Curceanu, C.; Grande, R. Del; Márton, J.; Moskal, P.; Scordo, A.; Silarski, M.; Sirghi, D.; Skurzok, M.; Tucaković, I.; Doce, O. Vázquez; Zmeskal, J.; Branchini, P.; Czerwiński, E.; Leo, V. De; Lucia, E. De; Cicco, Alessandro Di; Fermani, P.; Fiore, S.; Krzemień, W.; Mandaglio, G.; Martini, M.; Río, E. Pérez del; Selce, A.

doi:10.1016/j.physletb.2018.05.025

Cited by 29 publications

(30 citation statements)

References 40 publications

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“…Recent measurements, however, have allowed to quantify the absorption cross sections of K − off two-, three-and several-nucleons in a quantitative way. The AMADEUS collaboration has published several works on the measurement of low energy K − absorption in exclusive channels, as K − n → Λπ − [166], or in semi-inclusive analyses, where either the Λp or the Σ 0 p final states are selected [94,101]. In the last two works, the multi-nucleons absorption of K − have been quantified for the first time.…”

Section: Experimental Measurements Of Antikaons In Mattermentioning

confidence: 99%

Strangeness in nuclei and neutron stars

Tolós

Fabbietti

2020

Progress in Particle and Nuclear Physics

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173

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We review the present status of the experimental and theoretical developments in the field of strangeness in nuclei and neutron stars. We start by discussing theKN interaction, that is governed by the presence of the Λ(1405). We continue by showing the two-pole nature of the Λ(1405), and the production mechanisms in photon-, pion-, kaon-induced reactions as well as proton-proton collisions, while discussing the formation ofKN N bound states. We then move to the theoretical and experimental analysis of the properties of kaons and antikaons in dense nuclear matter, paying a special attention to kaonic atoms and the analysis of strangeness creation and propagation in nuclear collisions. Next, we examine the φ meson and the advances in photoproduction, protoninduced and pion-induced reactions, so as to understand its properties in dense matter. Finally, we address the dynamics of hyperons with nucleons and nuclear matter, and the connection to the phases of dense matter with strangeness in the interior of neutron stars.

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Section: Experimental Measurements Of Antikaons In Mattermentioning

confidence: 99%

Strangeness in nuclei and neutron stars

Tolós

Fabbietti

2020

Progress in Particle and Nuclear Physics

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173

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“…The second bias is related to the non-resonant K − N → Σπ contribution that has to be subtracted in order to extract the Λ(1405) shape. The K − n → Λπ − non-resonant transition amplitude modulus below theKN threshold was obtained for the first time in [19] exploiting K − absorptions on 4 He target nuclei.…”

Section: Resonant and Non-resonant Yπ Transition Amplitudes Below Thementioning

confidence: 95%

“…2. Panels a-f: p Λπ (Λπ momentum), cos(θ Λπ ) (cosine of angle between Λ and π), m Λπ (Λπ invariant mass), T Λπ , p Λ (Λ momentum) and p π (π momentum) distributions [19]. The experimental data and the corresponding statistical errors are represented by the black crosses, the systematic errors are light blue boxes.…”

Section: Resonant and Non-resonant Yπ Transition Amplitudes Below Thementioning

confidence: 99%

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Low-energy K⁻ Hadronic Interactions with Light Nuclei by AMADEUS

Skurzok

Belotti

Bragadireanu

et al. 2019

Proceedings of the 8th International Conference on Quarks and Nuclear Physics (QNP2018)

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The AMADEUS collaboration aims to provide new experimental constraints to the K − N strong interaction in the regime of non-perturbative QCD, exploiting low-energy K − hadronic interactions with light nuclei (e.g. H, 4 He, 9 Be and 12 C). The low-momentum kaons (p K ∼ 127 MeV/c) produced at the DAΦNE collider are ideal to explore both stopped and in-flight K − nuclear captures. The KLOE detector is used as an active target, allowing to achieve excellent acceptance and resolutions for the data. In this work the results obtained from the study of Λπ − and Λp correlated production in the final state are presented.

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“…In the simulations the same amount of K − captures atrest and in-flight is considered, based on Ref. [60]; in this work the direct π − production following K − absorptions on neutrons is investigated considering the separate contributions of K − at-rest and in-flight captures, which are found to equally contribute (within the experimental errors) to the final measured sample. In the present work, the error introduced by this assumption was included as a contribution to the systematic errors.…”

Section: Monte Carlo Simulationsmentioning

confidence: 99%

$$\hbox {K}^{-}$$ K - multi-nucleon absorption cross sections and branching ratios in $$\Lambda \hbox {p}$$ Λ p

et al. 2019

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The determination of low-energy cross sections and branching ratios of the K − multi-nucleon absorption processes in p and 0 p final states performed by the AMADEUS collaboration is presented. Low momentum K − (p K 127 MeV/c) produced at the DA NE collider are impinged on a Carbon target within the KLOE detector and the two and three nucleon absorption processes are disentangled by comparing the experimental data to phenomenological calculations. The p spectra are interpreted in terms of K − multi-nucleon absorption processes; the possible contribution of a K − pp bound state is demonstrated to overlap with the two nucleon capture process, its absolute yield thus resulting indistinguishable.

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First measurement of the K−n →Λπ− non-resonant transition amplitude below threshold

Cited by 29 publications

References 40 publications

Strangeness in nuclei and neutron stars

Strangeness in nuclei and neutron stars

Low-energy K⁻ Hadronic Interactions with Light Nuclei by AMADEUS

$$\hbox {K}^{-}$$ K - multi-nucleon absorption cross sections and branching ratios in $$\Lambda \hbox {p}$$ Λ p

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First measurement of the K−n →Λπ− non-resonant transition amplitude below threshold

Cited by 29 publications

References 40 publications

Strangeness in nuclei and neutron stars

Strangeness in nuclei and neutron stars

Low-energy K− Hadronic Interactions with Light Nuclei by AMADEUS

$$\hbox {K}^{-}$$ K - multi-nucleon absorption cross sections and branching ratios in $$\Lambda \hbox {p}$$ Λ p

Contact Info

Product

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Low-energy K⁻ Hadronic Interactions with Light Nuclei by AMADEUS