Hyperfine spectroscopy of hydrogen and antihydrogen in ASACUSA
E. Widmann, C. Amsler, S. Arguedas Cuendis, H. Breuker, M. Diermaier,, P. Dupr\'e, C. Evans, M. Fleck, A. Gligorova, H. Higaki, Y. Kanai, B., Kolbinger, N. Kuroda, M. Leali, A.M.M. Leite, V. M\"ackel, C. Malbrunot, V., Mascagna, O. Massiczek, Y. Matsuda, D.J. Murtagh, Y. Nagata
TL;DR
The paper reviews the progress of the ASACUSA collaboration in performing hyperfine spectroscopy of hydrogen and antihydrogen to test CPT symmetry, including apparatus commissioning and initial measurements.
Contribution
It presents the current status and recent progress in antihydrogen hyperfine spectroscopy at CERN, highlighting experimental setup and initial results.
Findings
Progress in antihydrogen hyperfine measurements
Calibration using polarized hydrogen beam
Advancements in spectroscopy apparatus
Abstract
The ASACUSA collaboration at the Antiproton Decelerator of CERN aims at a precise measurement of the antihydrogen ground-state hyperfine structure as a test of the fundamental CPT symmetry. A beam of antihydrogen atoms is formed in a CUSP trap, undergoes Rabi-type spectroscopy and is detected downstream in a dedicated antihydrogen detector. In parallel measurements using a polarized hydrogen beam are being performed to commission the spectroscopy apparatus and to perform measurements of parameters of the Standard Model Extension (SME). The current status of antihydrogen spectroscopy is reviewed and progress of ASACUSA is presented.
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