Laser Spectroscopy Measurements of Metastable Pionic Helium Atoms at Paul Scherrer Institute

M Hori; H Aghai-Khozani; A Sótér; A Dax; D Barna

doi:10.1007/s00601-021-01630-3

Laser Spectroscopy Measurements of Metastable Pionic Helium Atoms at Paul Scherrer Institute

Few Body Syst. 2021;62(3):63. doi: 10.1007/s00601-021-01630-3. Epub 2021 Jul 29.

Authors

M Hori¹, H Aghai-Khozani^{1

2}, A Sótér³, A Dax⁴, D Barna^{5

6}

Affiliations

¹ Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany.
² Present Address: McKinsey and Company, Munich, Germany.
³ Present Address: ETH Zürich, IPA, Zurich, Switzerland.
⁴ Present Address: Paul Scherrer Institut, CH-5232 Villigen, Switzerland.
⁵ CERN, CH-1211 Geneva, Switzerland.
⁶ Present Address: Institute for Particle and Nuclear Physics, Wigner Research Centre for Physics, Budapest, Hungary.

Abstract

We review recent experiments carried out by the PiHe collaboration of the Paul Scherrer Institute (PSI) that observed an infrared transition of three-body pionic helium atoms by laser spectroscopy. These measurements may lead to a precise determination of the charged pion mass, and complement experiments of antiprotonic helium atoms carried out at the new ELENA facility of CERN.