Studies of mesic atoms and nuclei

0489140 - ÚJF 2019 IT eng C - Konferenční příspěvek (zahraniční konf.)
Friedman, E. - Gal, A. - Cieplý, Aleš - Óbertová, Jaroslava - Mareš, Jiří
Studies of mesic atoms and nuclei.
Proceedings of Science. Vol. 310. Trieste: SISSA, 2018, č. článku 195. ISSN 1824-8039.
[XVII International Conference on Hadron Spectroscopy and Structure (Hadron2017). Salamanca (ES), 25.09.2017-29.09.2017]
Grant CEP: GA ČR(CZ) GA15-04301S
Institucionální podpora: RVO:61389005
Klíčová slova: anti K * quasibound states * scattering amplitudes
Obor OECD: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Anti K mesons offer a unique setting where mesic atoms have been studied both experimentally and theoretically, thereby placing constraints on the possible existence and properties of meson-nuclear quasibound states. Here we review progress in this field made recently by the Jerusalem-Prague Collaboration using near-threshold anti KN scattering amplitudes generated in several meson-baryon coupled channels models inspired by a chiral EFT approach. Our own procedure of handling subthreshold kinematics self consistently is used to transform these free-space energy dependent amplitudes to in-medium density dependent amplitudes from which anti K optical potentials are derived. To fit the world data of kaonic atoms, these single-nucleon optical potentials are augmented by multi-nucleon terms. It is found that only two of the studied models reproduce also the single-nucleon absorption fractions available from old bubble chamber experiments. These two models are then checked for possible anti K nuclear quasibound states, despite realizing that anti K optical potentials are not constrained by kaonic atom data at densities exceeding half nuclear-matter density. We find that when such states exist, their widths are invariably above 100 MeV, forbiddingly large to allow observation. Multi-nucleon absorption is found to be substantial in this respect. This suggests that observable strongly bound anti K mesons are limited to the very light systems, such as anti K pp.

Trvalý link: http://hdl.handle.net/11104/0283613