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Kaonic Atoms to Investigate Global Symmetry Breaking

1
INFN, Laboratori Nazionali di Frascati, Frascati, 00044 Roma, Italy
2
Horia Hulubei National Institute of Physics and Nuclear Engineering, IFIN-HH, Magurele 077125, Romania
3
Politecnico di Milano, Dipartimento di Elettronica, Informazione e Bioingegneria and INFN Sezione di Milano, 20133 Milano, Italy
4
Department of Physics, Faculty of Science, University of Zagreb, 10000 Zagreb, Croatia
5
Stefan-Meyer-Institut für Subatomare Physik, 1090 Vienna, Austria
6
Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi”, 00184 Roma, Italy
7
RIKEN, Tokyo 351-0198, Japan
8
The M. Smoluchowski Institute of Physics, Jagiellonian University, 30-348 Kraków, Poland
9
Excellence Cluster Universe, Technische Universiät München, 85748 Garching, Germany
*
Author to whom correspondence should be addressed.
Symmetry 2020, 12(4), 547; https://doi.org/10.3390/sym12040547
Received: 22 January 2020 / Revised: 12 February 2020 / Accepted: 16 March 2020 / Published: 4 April 2020
(This article belongs to the Special Issue Symmetry in Atomic, Nuclear and Particle Physics)
Kaonic atoms measure the antikaon-nucleus interaction at almost zero relative energy, allowing one to determine basic low-energy quantum chromodynamics (QCD) quantities, namely, the antikaon-nucleon ( K ¯ N) scattering lengths. The latter are important for extracting the sigma terms which are built on the symmetry breaking part of the Hamiltonian, thereby providing a measure of chiral and SU(3) symmetries breaking. After discussing the sigma terms and their relations to the kaonic atoms, we describe the most precise measurement in the literature of kaonic hydrogen, performed at LNF-INFN by the SIDDHARTA experiment. Kaonic deuterium is still to be measured, and two experiments are planned. The first, SIDDHARTA-2 at LNF-INFN was installed on DA Φ NE in spring 2019 and will collect data in 2020. The second, E57 at J-PARC, will become operative in 2021. View Full-Text
Keywords: kaonic atoms; sigma terms; low-energy QCD kaonic atoms; sigma terms; low-energy QCD
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Curceanu, C.; Guaraldo, C.; Sirghi, D.; Amirkhani, A.; Baniahmad, A.; Bazzi, M.; Bellotti, G.; Bosnar, D.; Bragadireanu, M.; Cargnelli, M.; Carminati, M.; Clozza, A.; De Paolis, L.; Del Grande, R.; Fiorini, C.; Iliescu, M.; Iwasaki, M.; King, P.; Levi Sandri, P.; Marton, J.; Miliucci, M.; Moskal, P.; Niedźwiecki, S.; Okada, S.; Piscicchia, K.; Scordo, A.; Silarski, M.; Sirghi, F.; Skurzok, M.; Spallone, A.; Tüchler, M.; Utica, G.; Vazquez Doce, O.; Zmeskal, J. Kaonic Atoms to Investigate Global Symmetry Breaking. Symmetry 2020, 12, 547.

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