Symmetry (Apr 2020)

Kaonic Atoms to Investigate Global Symmetry Breaking

  • Catalina Curceanu,
  • Carlo Guaraldo,
  • Diana Sirghi,
  • Aidin Amirkhani,
  • Ata Baniahmad,
  • Massimiliano Bazzi,
  • Giovanni Bellotti,
  • Damir Bosnar,
  • Mario Bragadireanu,
  • Michael Cargnelli,
  • Marco Carminati,
  • Alberto Clozza,
  • Luca De Paolis,
  • Raffaele Del Grande,
  • Carlo Fiorini,
  • Mihail Iliescu,
  • Masahiko Iwasaki,
  • Pietro King,
  • Paolo Levi Sandri,
  • Johann Marton,
  • Marco Miliucci,
  • Paweł Moskal,
  • Szymon Niedźwiecki,
  • Shinji Okada,
  • Kristian Piscicchia,
  • Alessandro Scordo,
  • Michał Silarski,
  • Florin Sirghi,
  • Magdalena Skurzok,
  • Antonio Spallone,
  • Marlene Tüchler,
  • Gianlorenzo Utica,
  • Oton Vazquez Doce,
  • Johann Zmeskal

DOI
https://doi.org/10.3390/sym12040547
Journal volume & issue
Vol. 12, no. 4
p. 547

Abstract

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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.

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