On the stability of Lambda(1405) matter

0509992 - ÚJF 2020 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Óbertová, Jaroslava - Barnea, N. - Friedman, E. - Gal, A. - Mareš, Jiří - Schäfer, Martin
On the stability of Lambda(1405) matter.
AIP Conference Proceedings. Vol. 2130. Melville: American Institute of Physics Inc., 2019, č. článku 040016. ISBN 978-0-7354-1872-1. ISSN 0094-243X.
[13th International Conference on Hypernuclear and Strange Particle Physics. Portsmouth (US), 24.06.2018-29.06.2018]
Institucionální podpora: RVO:61389005
Klíčová slova: resonance * baryon * kanoic atoms
Obor OECD: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

A hypothesis of absolutely stable strange hadronic matter composed of Lambda(1405) baryons, here denoted Lambda(star), is tested within many-body calculations performed using the Relativistic Mean-Field approach. In our calculations, we employed the Lambda(star)Lambda(star) interaction compatible with the Lambda(star)Lambda(star) binding energy Lambda(star)Lambda(star) = 40 MeV given by the phenomenological energy-independent K- N interaction model by Yamazaki and Akaishi (YA). We found that the binding energy per Lambda(star), as well as the central density in Lambda(star) many-body systems saturates for mass number A (inequality) 120, leaving Lambda(star) aggregates highly unstable against strong interaction decay. Moreover, we confronted the YA interaction model with kaonic atom data and found that it fails to reproduce the K- single-nucleon absorption fractions at rest from bubble chamber experiments.
Trvalý link: http://hdl.handle.net/11104/0300561